diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 0484f65..103d97a 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -23,12 +23,10 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install nix
-        uses: cachix/install-nix-action@v25
-        with:
-          install_url: https://releases.nixos.org/nix/nix-2.20.1/install
+        uses: cachix/install-nix-action@v30
 
       - name: Set up cachix
-        uses: cachix/cachix-action@v14
+        uses: cachix/cachix-action@v15
         with:
           name: holochain-ci
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2723bb..b0f2715 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,3 +4,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+### Changed
+
+- Rewritten as a canonical client for **Holochain 0.6**. The conductor wire
+  protocol is implemented directly: msgpack framing, the `{type, value}`
+  envelope, and fully-typed admin/app request and response models.
+- Zome-call signing is now done in-language with `msgpack` + `hashlib.sha512` +
+  `PyNaCl`, dropping the archived native `holochain-serialization` dependency.
+- Response deserialization into typed models (HoloHashes, `CellId`, `AppInfo`,
+  `CellInfo`, capability grants, …) via a type-driven serde layer.
+- Async-only API surface (`AdminClient`, `AppClient`).
+- Test fixture upgraded to Holochain 0.6 (hdk 0.6 / hdi 0.7, current DNA/app
+  manifest format).
+- Tooling moved to Python 3.10+ and the modern Holonix flake.
diff --git a/HANDOFF-python-client-zome-call-signing.md b/HANDOFF-python-client-zome-call-signing.md
new file mode 100644
index 0000000..65999cc
--- /dev/null
+++ b/HANDOFF-python-client-zome-call-signing.md
@@ -0,0 +1,159 @@
+# Handoff: Zome-call signing for a Holochain Python client
+
+**Audience:** an agent building/maintaining the downstream Python client library for Holochain.
+**Date:** 2026-06-03. **Holochain target at time of writing:** 0.6.1.
+
+## TL;DR
+
+Do **not** depend on a native serialization crate (the `holochain-serialization-python`
+pyo3 binding — now **archived**). The JS client (`@holochain/client`) dropped its
+equivalent (`holochain-serialization-js`) and now signs zome calls with plain
+**msgpack + sha512 + ed25519**, entirely in-language. A Python client should do the
+same with `msgpack` + `hashlib.sha512` + `PyNaCl`. No Rust, no `maturin`, no
+per-platform wheels, no chasing Holochain crate versions.
+
+## Why the native serialization lib is obsolete
+
+Old model (pre-0.4-ish): the client sent **structured** zome-call params; the
+conductor re-serialized them with its canonical Rust serializer and hashed the
+result. Client and conductor therefore had to serialize **byte-identically**, which
+is why a Rust binding existed — to reuse the exact `holochain_serialized_bytes`
+encoder. (`holochain-serialization-python::get_data_to_sign` reflects this: it
+returns only the 32-/now-64-byte **hash**, not the bytes.)
+
+Current model: the client serializes the params itself, signs the hash of *those*
+bytes, and transmits **both the bytes and the signature** as `CallZomeRequestSigned
+{ bytes, signature }`. The conductor verifies by hashing the **received bytes** — it
+does **not** re-serialize. Consequence: the client's serialization no longer has to
+match any canonical Rust impl. Any msgpack encoding the conductor can deserialize
+into `ZomeCallParams` works, in any field order. That removed the entire reason for
+the serialization library.
+
+## Reference implementation (TypeScript, authoritative)
+
+Repo `holochain/holochain-client-js`, branch `main`:
+
+- `src/api/app/websocket.ts:652` — `signZomeCall(request)`. The core:
+  ```ts
+  const zome_call_params = {
+    cap_secret, cell_id, zome_name, fn_name, provenance,
+    payload: encode(request.payload),   // payload is itself msgpack-encoded first
+    nonce: await randomNonce(),
+    expires_at: getNonceExpiration(),
+  };
+  const bytes     = encode(zome_call_params);     // @msgpack/msgpack
+  const bytesHash = new Uint8Array(sha512.array(bytes));   // js-sha512
+  const signature = sodium.crypto_sign(bytesHash, keyPair.privateKey)
+                          .subarray(0, sodium.crypto_sign_BYTES); // detached, 64 bytes
+  return { bytes, signature };          // CallZomeRequestSigned
+  ```
+- `src/api/zome-call-signing.ts` — signing keypair, nonce, cap-secret, credential store.
+- `src/api/admin/websocket.ts:324` — `grantSigningKey` / `authorizeSigningCredentials`.
+- `src/utils/hash-parts.ts` — HoloHash byte layout & type prefixes.
+
+Relevant runtime deps in the JS client `package.json` (no serialization lib):
+`@msgpack/msgpack`, `js-sha512`, `@bitgo/blake2b`, `libsodium-wrappers`,
+`js-base64`, `lodash-es`.
+
+## The signing algorithm, precisely
+
+1. **Signing keypair is ephemeral**, not the agent's real key. Generate an ed25519
+   keypair; authorize it on the conductor via the admin API (below). Store
+   `{ capSecret, keyPair, signingKey }` per `cellId`.
+2. **`signingKey` (= `provenance`)** is a 39-byte AgentPubKey holohash:
+   `[132, 32, 36]` (Agent prefix) + 32-byte ed25519 public key + 4-byte DHT location.
+   The JS client fakes the location as the last 4 bytes of a supplied agent key, else
+   `[0,0,0,0]`. Hash layout (from `hash-parts.ts`): 3-byte type prefix + 32-byte core
+   + 4-byte location = 39 bytes. Agent prefix `[132,32,36]`, Dna `[132,45,36]`, etc.
+3. **`payload` is double-encoded**: msgpack-encode the call payload first, then it
+   becomes a `bytes` field inside the params map that is msgpack-encoded again.
+4. **`expires_at`** = `(now_ms + 5*60*1000) * 1000` → microseconds since epoch (i64).
+5. **`nonce`** = 32 random bytes. **`cap_secret`** = 64 bytes (or `None`/absent if the
+   grant is unrestricted).
+6. **`cell_id`** is a 2-element array `[dna_hash(39B), agent_pubkey(39B)]`.
+7. Serialize the params map with msgpack, `sha512` the bytes, ed25519-sign the **hash**
+   (detached 64-byte signature), send `{ bytes, signature }`.
+
+## Python implementation guidance
+
+```python
+import time, secrets, hashlib, msgpack
+from nacl.signing import SigningKey          # PyNaCl; wraps libsodium ed25519
+
+def now_micros_plus_5min() -> int:
+    return (int(time.time() * 1000) + 5 * 60 * 1000) * 1000
+
+def sign_zome_call(*, cell_id, zome_name, fn_name, payload,
+                   provenance, cap_secret, signing_key: SigningKey):
+    params = {
+        "cap_secret": cap_secret,                       # bytes(64) or None
+        "cell_id": [cell_id[0], cell_id[1]],            # [dna_hash, agent_pubkey], 39B each
+        "zome_name": zome_name,                         # str
+        "fn_name": fn_name,                             # str
+        "provenance": provenance,                       # 39-byte signing AgentPubKey
+        "payload": msgpack.packb(payload, use_bin_type=True),
+        "nonce": secrets.token_bytes(32),
+        "expires_at": now_micros_plus_5min(),
+    }
+    data = msgpack.packb(params, use_bin_type=True)
+    bytes_hash = hashlib.sha512(data).digest()
+    signature = signing_key.sign(bytes_hash).signature  # 64-byte detached ed25519 sig
+    return {"bytes": data, "signature": signature}      # CallZomeRequestSigned
+```
+
+### Correctness pitfalls (will silently produce a rejected signature)
+
+- **`use_bin_type=True` is mandatory.** Byte fields (hashes, nonce, cap_secret,
+  pre-encoded payload) must serialize as msgpack `bin`, not `str`. Equivalent to JS
+  encoding `Uint8Array`.
+- **Pass `bytes`, not `list[int]`,** for all byte fields so msgpack picks `bin`.
+- **Field order doesn't matter for correctness** (conductor hashes received bytes),
+  but you MUST hash exactly the bytes you transmit. Don't re-encode between hashing
+  and sending.
+- **ed25519 key material:** libsodium `crypto_sign` secret keys are 64 bytes
+  (seed+pubkey); PyNaCl `SigningKey` takes a 32-byte seed. Use one consistently and
+  make sure the public key embedded in `provenance` matches the private key you sign
+  with. Prefer `nacl.bindings.crypto_sign_*` if you need byte-exact libsodium parity.
+- Sign the **sha512 hash**, not the raw bytes.
+
+### Capability authorization (required before any signed call works)
+
+Mirror `AdminWebsocket.authorizeSigningCredentials` / `grantSigningKey`
+(`src/api/admin/websocket.ts:324`):
+
+1. Generate ephemeral signing keypair → derive 39-byte `signingKey`.
+2. `randomCapSecret()` = 64 random bytes.
+3. Admin call `grant_zome_call_capability` with:
+   ```
+   cap_grant: {
+     tag: "zome-call-signing-key",
+     functions: { type: "all" }  // or { type: "listed", value: [[zome, fn], ...] }
+     access: { type: "assigned", value: { secret: capSecret, assignees: [signingKey] } }
+   }
+   ```
+4. Store `{ capSecret, keyPair, signingKey }` keyed by `cellId`; reuse for signing.
+
+## Suggested Python deps
+
+`msgpack` (the `msgpack` PyPI package), `PyNaCl` (ed25519 / libsodium). `hashlib`
+covers sha512 from stdlib. msgpack/admin transport is WebSocket — pick an async ws
+client (e.g. `websockets`). No native build toolchain required.
+
+## Open items to verify against a live 0.6.1 conductor
+
+- Exact admin `grant_zome_call_capability` request shape on the **Python** transport
+  (field names are snake_case on the wire; cross-check the conductor API for 0.6.1).
+- Whether `cap_secret` should be **absent** vs explicit `None` for unrestricted
+  grants — match what the conductor's serde expects (`Option<CapSecret>`).
+- Confirm `CallZomeRequestSigned` is the accepted request variant name in 0.6.1.
+- App-authentication token flow (`issue_app_authentication_token`) precedes app-ws
+  calls in the JS client — replicate it.
+
+## Don't
+
+- Don't revive the pyo3 `holochain-serialization-python` crate. It's archived, it ties
+  you to specific Holochain crate versions (painful: every Holochain bump is a port —
+  e.g. 0.2→0.6 renamed `ZomeCallUnsigned`→`ZomeCallParams`, `data_to_sign()`→
+  `serialize_and_hash()`, changed the hash from blake2b/32B to sha512/64B), and it
+  only returns the hash anyway — which is the wrong shape for the send-the-bytes
+  protocol.
diff --git a/README.md b/README.md
index dbe8bc4..195da3e 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,36 @@
 
 # Holochain Client - Python
 
-> [!WARNING]
-> :radioactive: This package is under development, it is not a complete Holochain client and is not fully tested! :radioactive:
+A Python client for the [Holochain](https://holochain.org/) Conductor API, targeting **Holochain 0.6**.
+
+It speaks the admin and app websocket interfaces directly: msgpack framing, the
+`{type, value}` request/response envelope, fully-typed request/response models,
+and client-side zome-call signing (msgpack + SHA-512 + ed25519 via PyNaCl — no
+native dependency).
+
+> [!NOTE]
+> Unstable-feature endpoints (countersigning, DNA migration) are not yet covered.
+
+### Usage
+
+```python
+from holochain_client import AdminClient, AppClient, AppBundlePath
+
+admin = await AdminClient.connect("ws://localhost:4444")
+app_info = await admin.install_app(
+    AppBundlePath(path="my-app.happ"), installed_app_id="my-app"
+)
+await admin.enable_app("my-app")
+
+cell_id = app_info.cell_info["my-role"][0].cell_id
+port = await admin.attach_app_interface(allowed_origins="*")
+token = await admin.issue_app_authentication_token("my-app")
+
+app = await AppClient.connect(f"ws://localhost:{port}", token.token)
+app.credentials.set(cell_id, await admin.authorize_signing_credentials(cell_id))
+
+result = await app.call_zome(cell_id, "my_zome", "my_fn", {"some": "payload"})
+```
 
 ### Set up a development environment
 
@@ -53,15 +81,20 @@ poetry run pytest
 To select a single test suite, pass the path to `pytest`. For example:
 
 ```bash
-poetry run tests/api/app/client_test.py
+poetry run pytest tests/app/test_zome_call.py
 ```
 
-To run a single test, pass the path to the test suite and the use the `-k` flag. For example:
+To run a single test, pass the path to the test suite and then use the `-k` flag. For example:
 
 ```bash
-poetry run pytest tests/api/app/client_test.py -k test_call_zome
+poetry run pytest tests/app/test_zome_call.py -k test_echo
 ```
 
+The integration tests boot a real conductor with `hc sandbox`. To run them
+against an already-running conductor instead, set `HC_ADMIN_PORT` to its admin
+port. The unit tests (`tests/test_serde.py`, `tests/test_signing.py`) need no
+conductor.
+
 > [!TIP]
 > By default `pytest` captures output. Use the `-s` flag in combination with `RUST_LOG=info` to debug tests against Holochain.
 
diff --git a/fixture/Cargo.lock b/fixture/Cargo.lock
index 63ac872..94288db 100644
--- a/fixture/Cargo.lock
+++ b/fixture/Cargo.lock
@@ -1,41 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "addr2line"
-version = "0.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
-dependencies = [
- "gimli 0.28.1",
-]
-
-[[package]]
-name = "adler"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
-
-[[package]]
-name = "ahash"
-version = "0.7.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a824f2aa7e75a0c98c5a504fceb80649e9c35265d44525b5f94de4771a395cd"
-dependencies = [
- "getrandom",
- "once_cell",
- "version_check",
-]
-
-[[package]]
-name = "aho-corasick"
-version = "1.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
-dependencies = [
- "memchr",
-]
+version = 4
 
 [[package]]
 name = "android-tzdata"
@@ -52,27 +17,12 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "approx"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cab112f0a86d568ea0e627cc1d6be74a1e9cd55214684db5561995f6dad897c6"
-dependencies = [
- "num-traits",
-]
-
 [[package]]
 name = "arrayref"
 version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6b4930d2cb77ce62f89ee5d5289b4ac049559b1c45539271f5ed4fdc7db34545"
 
-[[package]]
-name = "arrayvec"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
-
 [[package]]
 name = "arrayvec"
 version = "0.7.4"
@@ -85,83 +35,20 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
-[[package]]
-name = "backtrace"
-version = "0.3.69"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
-dependencies = [
- "addr2line",
- "cc",
- "cfg-if 1.0.0",
- "libc",
- "miniz_oxide",
- "object",
- "rustc-demangle",
-]
-
 [[package]]
 name = "base64"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
-
-[[package]]
-name = "bincode"
-version = "1.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1f45e9417d87227c7a56d22e471c6206462cba514c7590c09aff4cf6d1ddcad"
-dependencies = [
- "serde",
-]
-
-[[package]]
-name = "bit-set"
-version = "0.5.3"
+version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
-dependencies = [
- "bit-vec",
-]
-
-[[package]]
-name = "bit-vec"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
-
-[[package]]
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-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
-[[package]]
-name = "bitflags"
-version = "2.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
-
-[[package]]
-name = "bitvec"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bc2832c24239b0141d5674bb9174f9d68a8b5b3f2753311927c172ca46f7e9c"
-dependencies = [
- "funty",
- "radium",
- "tap",
- "wyz",
-]
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "blake2b_simd"
-version = "0.5.11"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afa748e348ad3be8263be728124b24a24f268266f6f5d58af9d75f6a40b5c587"
+checksum = "b79834656f71332577234b50bfc009996f7449e0c056884e6a02492ded0ca2f3"
 dependencies = [
  "arrayref",
- "arrayvec 0.5.2",
+ "arrayvec",
  "constant_time_eq",
 ]
 
@@ -180,72 +67,12 @@ version = "3.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
 
-[[package]]
-name = "bytecheck"
-version = "0.6.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23cdc57ce23ac53c931e88a43d06d070a6fd142f2617be5855eb75efc9beb1c2"
-dependencies = [
- "bytecheck_derive",
- "ptr_meta",
- "simdutf8",
-]
-
-[[package]]
-name = "bytecheck_derive"
-version = "0.6.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3db406d29fbcd95542e92559bed4d8ad92636d1ca8b3b72ede10b4bcc010e659"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
 [[package]]
 name = "byteorder"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
-[[package]]
-name = "bytes"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
-
-[[package]]
-name = "camino"
-version = "1.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c59e92b5a388f549b863a7bea62612c09f24c8393560709a54558a9abdfb3b9c"
-dependencies = [
- "serde",
-]
-
-[[package]]
-name = "cargo-platform"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2cfa25e60aea747ec7e1124f238816749faa93759c6ff5b31f1ccdda137f4479"
-dependencies = [
- "serde",
-]
-
-[[package]]
-name = "cargo_metadata"
-version = "0.15.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eee4243f1f26fc7a42710e7439c149e2b10b05472f88090acce52632f231a73a"
-dependencies = [
- "camino",
- "cargo-platform",
- "semver 1.0.20",
- "serde",
- "serde_json",
- "thiserror",
-]
-
 [[package]]
 name = "cc"
 version = "1.0.83"
@@ -255,12 +82,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "cfg-if"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
-
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -277,31 +98,32 @@ dependencies = [
  "iana-time-zone",
  "num-traits",
  "serde",
- "windows-targets 0.52.0",
+ "windows-targets",
 ]
 
 [[package]]
 name = "colored"
-version = "1.9.4"
+version = "3.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a5f741c91823341bebf717d4c71bda820630ce065443b58bd1b7451af008355"
+checksum = "faf9468729b8cbcea668e36183cb69d317348c2e08e994829fb56ebfdfbaac34"
 dependencies = [
- "is-terminal",
- "lazy_static",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
 name = "constant_time_eq"
-version = "0.1.5"
+version = "0.4.2"
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-checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
+checksum = "3d52eff69cd5e647efe296129160853a42795992097e8af39800e1060caeea9b"
 
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-checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
+checksum = "633458d4ef8c78b72454de2d54fd6ab2e60f9e02be22f3c6104cdc8a4e0fceb9"
+dependencies = [
+ "unicode-segmentation",
+]
 
 [[package]]
 name = "core-foundation-sys"
@@ -309,19 +131,6 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06ea2b9bc92be3c2baa9334a323ebca2d6f074ff852cd1d7b11064035cd3868f"
 
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- "libc",
- "scopeguard",
- "windows-sys 0.33.0",
-]
-
 [[package]]
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 version = "0.2.12"
@@ -331,123 +140,6 @@ dependencies = [
  "libc",
 ]
 
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- "cranelift-codegen-shared",
- "cranelift-egraph",
- "cranelift-entity",
- "cranelift-isle",
- "gimli 0.26.2",
- "log",
- "regalloc2",
- "smallvec",
- "target-lexicon",
-]
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-
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-
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-
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -460,108 +152,60 @@ dependencies = [
 
 [[package]]
 name = "darling"
-version = "0.14.4"
+version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b750cb3417fd1b327431a470f388520309479ab0bf5e323505daf0290cd3850"
+checksum = "9cdf337090841a411e2a7f3deb9187445851f91b309c0c0a29e05f74a00a48c0"
 dependencies = [
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-
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-dependencies = [
- "darling_core 0.20.5",
- "darling_macro 0.20.5",
+ "darling_core",
+ "darling_macro",
 ]
 
 [[package]]
 name = "darling_core"
-version = "0.14.4"
+version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "109c1ca6e6b7f82cc233a97004ea8ed7ca123a9af07a8230878fcfda9b158bf0"
+checksum = "1247195ecd7e3c85f83c8d2a366e4210d588e802133e1e355180a9870b517ea4"
 dependencies = [
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  "ident_case",
  "proc-macro2",
  "quote",
  "strsim",
- "syn 1.0.109",
-]
-
-[[package]]
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-version = "0.20.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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- "proc-macro2",
- "quote",
- "syn 2.0.48",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "darling_core 0.14.4",
- "quote",
- "syn 1.0.109",
+ "syn 2.0.117",
 ]
 
 [[package]]
 name = "darling_macro"
-version = "0.20.5"
+version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d1545d67a2149e1d93b7e5c7752dce5a7426eb5d1357ddcfd89336b94444f77"
+checksum = "d38308df82d1080de0afee5d069fa14b0326a88c14f15c5ccda35b4a6c414c81"
 dependencies = [
- "darling_core 0.20.5",
+ "darling_core",
  "quote",
- "syn 2.0.48",
-]
-
-[[package]]
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-version = "5.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "cfg-if 1.0.0",
- "hashbrown 0.14.3",
- "lock_api",
- "once_cell",
- "parking_lot_core",
+ "syn 2.0.117",
 ]
 
 [[package]]
-name = "derivative"
-version = "2.2.0"
+name = "derive_more"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fcc3dd5e9e9c0b295d6e1e4d811fb6f157d5ffd784b8d202fc62eac8035a770b"
+checksum = "d751e9e49156b02b44f9c1815bcb94b984cdcc4396ecc32521c739452808b134"
 dependencies = [
- "proc-macro2",
- "quote",
- "syn 1.0.109",
+ "derive_more-impl",
 ]
 
 [[package]]
-name = "derive_more"
-version = "0.99.17"
+name = "derive_more-impl"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fb810d30a7c1953f91334de7244731fc3f3c10d7fe163338a35b9f640960321"
+checksum = "799a97264921d8623a957f6c3b9011f3b5492f557bbb7a5a19b7fa6d06ba8dcb"
 dependencies = [
  "convert_case",
  "proc-macro2",
  "quote",
  "rustc_version",
- "syn 1.0.109",
+ "syn 2.0.117",
+ "unicode-xid",
 ]
 
 [[package]]
@@ -580,81 +224,19 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56ce8c6da7551ec6c462cbaf3bfbc75131ebbfa1c944aeaa9dab51ca1c5f0c3b"
 
-[[package]]
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-
-[[package]]
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-dependencies = [
- "enum-iterator-derive",
-]
-
-[[package]]
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- "syn 1.0.109",
-]
-
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-dependencies = [
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-
-[[package]]
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-dependencies = [
- "darling 0.20.5",
- "proc-macro2",
- "quote",
- "syn 2.0.48",
-]
-
 [[package]]
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 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
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-checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
-dependencies = [
- "libc",
- "windows-sys 0.52.0",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
-
 [[package]]
 name = "fixture"
 version = "0.0.1"
 dependencies = [
  "fixture_integrity",
  "hdk",
+ "holochain_serialized_bytes",
  "serde",
 ]
 
@@ -663,6 +245,7 @@ name = "fixture_integrity"
 version = "0.0.1"
 dependencies = [
  "hdi",
+ "holochain_serialized_bytes",
  "serde",
 ]
 
@@ -673,25 +256,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
-name = "form_urlencoded"
-version = "1.2.1"
+name = "futures"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
-dependencies = [
- "percent-encoding",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6d5a32815ae3f33302d95fdcb2ce17862f8c65363dcfd29360480ba1001fc9c"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
+checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -743,7 +311,7 @@ checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.48",
+ "syn 2.0.117",
 ]
 
 [[package]]
@@ -776,27 +344,6 @@ dependencies = [
  "slab",
 ]
 
-[[package]]
-name = "fxhash"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
-dependencies = [
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-
-[[package]]
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-dependencies = [
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- "num-integer",
- "num-traits",
- "trilean",
-]
-
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -809,39 +356,14 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.12"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
  "libc",
- "wasi",
-]
-
-[[package]]
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-version = "0.26.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "indexmap 1.9.3",
- "stable_deref_trait",
-]
-
-[[package]]
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-checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
-
-[[package]]
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-checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
-dependencies = [
- "ahash",
+ "r-efi",
+ "wasip2",
 ]
 
 [[package]]
@@ -852,13 +374,16 @@ checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
 
 [[package]]
 name = "hdi"
-version = "0.3.5"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95c916ed1bb10308ffb9e7295a3ea94c5485df949c8808e513e94c21fc10e7e8"
+checksum = "df74665942cd911ca26245b3a68c783eef902018d41994e3192660fd9b157e0c"
 dependencies = [
+ "getrandom",
  "hdk_derive",
  "holo_hash",
  "holochain_integrity_types",
+ "holochain_serialized_bytes",
+ "holochain_serialized_bytes_derive",
  "holochain_wasmer_guest",
  "paste",
  "serde",
@@ -869,9 +394,9 @@ dependencies = [
 
 [[package]]
 name = "hdk"
-version = "0.2.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73cd358ee67fe3c93a20441508c63a10f479a48b234c51f41cf8a7926aec7601"
+checksum = "cccd037e53cd05e518f66b839f0a57cda156a55dca0599bb1a4518ec371da801"
 dependencies = [
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  "hdi",
@@ -881,87 +406,96 @@ dependencies = [
  "holochain_zome_types",
  "paste",
  "serde",
- "serde_bytes",
- "thiserror",
  "tracing",
  "tracing-core",
 ]
 
 [[package]]
 name = "hdk_derive"
-version = "0.2.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "471d8ea11118a6b8d433340969b20584b80f964ccbd86d4ef25f9663951a2b35"
+checksum = "21166508c997b6a767734116f05dd0b1d9511883def0f729f2cf97d12ae18839"
 dependencies = [
- "darling 0.14.4",
+ "darling",
  "heck",
  "holochain_integrity_types",
  "paste",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.117",
 ]
 
 [[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0c62115964e08cb8039170eb33c1d0e2388a256930279edca206fff675f82c3"
-
-[[package]]
-name = "hex"
-version = "0.4.3"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
 [[package]]
 name = "holo_hash"
-version = "0.2.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a6c9040dfd9abfbee4c63c9f456ac9e3d10332f2f5d31cf9d36d904e90ef3e0"
+checksum = "8e08d69f8af5042aa369b7fda3d9bea7ffe08de680aa9f897c29e50de0e2460c"
 dependencies = [
  "base64",
  "blake2b_simd",
  "derive_more",
+ "futures",
  "holochain_serialized_bytes",
  "holochain_util",
  "holochain_wasmer_common",
- "kitsune_p2p_dht_arc",
+ "must_future",
  "serde",
  "serde_bytes",
+ "sha2",
  "thiserror",
 ]
 
 [[package]]
 name = "holochain_integrity_types"
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+checksum = "71fef817394dab4d006be7a24fb0e322db32b0060c949ee05a96df02b8eef508"
 dependencies = [
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+ "holochain_secure_primitive",
  "holochain_serialized_bytes",
+ "holochain_timestamp",
  "holochain_util",
- "kitsune_p2p_dht",
- "kitsune_p2p_timestamp",
- "paste",
  "serde",
  "serde_bytes",
  "subtle",
  "tracing",
 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcf25c0d084ff290a8650c2fc82bd4341fc25d0d5f7ffe9af63a2ca9d50d9f0f"
+dependencies = [
+ "getrandom",
+ "holochain_secure_primitive",
+ "holochain_timestamp",
+]
+
+[[package]]
+name = "holochain_secure_primitive"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c794f7bd4abe9b687cc98483bbeeb83d87771073218ce52ae67c871a6d15fa4"
+dependencies = [
+ "paste",
+ "serde",
+ "subtle",
+]
+
 [[package]]
 name = "holochain_serialized_bytes"
-version = "0.0.53"
+version = "0.0.57"
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-checksum = "5f7a5fc7c745a107f8ebcb04caab7a6b7a8463e2811f07ced19c281977583de7"
+checksum = "96007831189981a1c799b92c54f59eaefc9968b2dfcfae21e84f674fcc4757db"
 dependencies = [
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  "rmp-serde",
@@ -974,51 +508,57 @@ dependencies = [
 
 [[package]]
 name = "holochain_serialized_bytes_derive"
-version = "0.0.53"
+version = "0.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec3e0cf02005cbf0f514476d40e02125b26df6d4922d7a2c48a84fc588539d71"
+checksum = "17c64dfa01304c2c4ceba04a823fc4b6b75602d65d26e639f33845178f057d4a"
 dependencies = [
  "quote",
- "syn 1.0.109",
+ "syn 2.0.117",
+]
+
+[[package]]
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+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a201a7ae0e181ac157c605f9335fdb4a0ddce5e4b6a5540ec9f77c5174feb073"
+dependencies = [
+ "chrono",
+ "serde",
 ]
 
 [[package]]
 name = "holochain_util"
-version = "0.2.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "df26e438014aa7ca3430d33893cdd9d30b252eeece880fd36222a9a4dd0bb2d3"
 dependencies = [
- "cfg-if 0.1.10",
- "derive_more",
+ "cfg-if",
+ "colored",
  "dunce",
  "futures",
- "num_cpus",
  "once_cell",
 ]
 
 [[package]]
 name = "holochain_wasmer_common"
-version = "0.0.92"
+version = "0.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72007fd2a72d77e76ffa494e5847bf6e893e25e73fe1d1de902e1b8d5033a64e"
+checksum = "5979991fcad709d52614595f548e1dbc7a48449221825bcf2c9c6bdf05dc2dd1"
 dependencies = [
  "holochain_serialized_bytes",
  "serde",
  "serde_bytes",
- "test-fuzz",
  "thiserror",
- "wasmer",
 ]
 
 [[package]]
 name = "holochain_wasmer_guest"
-version = "0.0.92"
+version = "0.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c429e84a19ee446f47541a6fed10e1a4376a8a8ba6d3dbff7d07e4a7bb4c85f"
+checksum = "6083d8b19601a1a5c46172ffa75fe1c873e4e0fa6138cc8829cf8621b578e5fc"
 dependencies = [
  "holochain_serialized_bytes",
  "holochain_wasmer_common",
- "parking_lot",
  "paste",
  "serde",
  "tracing",
@@ -1026,34 +566,26 @@ dependencies = [
 
 [[package]]
 name = "holochain_zome_types"
-version = "0.2.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b276d76c217b4a4490bf4651f2e89c2a20589a5d9700855b4bd430fedb6be75a"
+checksum = "34a27bd154f022c9eabae7fde1b44bd9b0f5d68005bdb43f5553d4e840824b54"
 dependencies = [
+ "derive_more",
  "holo_hash",
  "holochain_integrity_types",
+ "holochain_nonce",
  "holochain_serialized_bytes",
+ "holochain_timestamp",
  "holochain_wasmer_common",
- "kitsune_p2p_bin_data",
- "kitsune_p2p_block",
- "kitsune_p2p_timestamp",
- "paste",
  "serde",
  "serde_bytes",
+ "strum",
+ "strum_macros",
  "subtle",
  "thiserror",
  "tracing",
 ]
 
-[[package]]
-name = "home"
-version = "0.5.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "windows-sys 0.52.0",
-]
-
 [[package]]
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 version = "0.1.60"
@@ -1083,32 +615,6 @@ version = "1.0.1"
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 checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
-[[package]]
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-dependencies = [
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- "unicode-normalization",
-]
-
-[[package]]
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-checksum = "cb56e1aa765b4b4f3aadfab769793b7087bb03a4ea4920644a6d238e2df5b9ed"
-
-[[package]]
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-dependencies = [
- "autocfg",
- "hashbrown 0.12.3",
-]
-
 [[package]]
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 version = "2.2.2"
@@ -1116,40 +622,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "824b2ae422412366ba479e8111fd301f7b5faece8149317bb81925979a53f520"
 dependencies = [
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- "hashbrown 0.14.3",
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-
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-dependencies = [
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- "num-integer",
- "num-traits",
- "trilean",
-]
-
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-
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-checksum = "f56a2d0bc861f9165be4eb3442afd3c236d8a98afd426f65d92324ae1091a484"
-dependencies = [
- "either",
+ "hashbrown",
 ]
 
 [[package]]
@@ -1167,120 +640,11 @@ dependencies = [
  "wasm-bindgen",
 ]
 
-[[package]]
-name = "kitsune_p2p_bin_data"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "holochain_util",
- "kitsune_p2p_dht_arc",
- "serde",
- "serde_bytes",
- "shrinkwraprs",
-]
-
-[[package]]
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-dependencies = [
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- "kitsune_p2p_timestamp",
- "serde",
- "serde_bytes",
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-
-[[package]]
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- "gcollections",
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- "kitsune_p2p_dht_arc",
- "kitsune_p2p_timestamp",
- "must_future",
- "num-traits",
- "once_cell",
- "rand",
- "serde",
- "statrs",
- "thiserror",
- "tracing",
-]
-
-[[package]]
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- "gcollections",
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- "num-traits",
- "serde",
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- "serde",
-]
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-
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-
 [[package]]
 name = "libc"
-version = "0.2.153"
+version = "0.2.186"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
-
-[[package]]
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-checksum = "4ec2a862134d2a7d32d7983ddcdd1c4923530833c9f2ea1a44fc5fa473989058"
-
-[[package]]
-name = "linux-raw-sys"
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-checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c168f8615b12bc01f9c17e2eb0cc07dcae1940121185446edc3744920e8ef45"
-dependencies = [
- "autocfg",
- "scopeguard",
-]
+checksum = "68ab91017fe16c622486840e4c83c9a37afeff978bd239b5293d61ece587de66"
 
 [[package]]
 name = "log"
@@ -1288,73 +652,12 @@ version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
-[[package]]
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-checksum = "b823e83b2affd8f40a9ee8c29dbc56404c1e34cd2710921f2801e2cf29527afa"
-dependencies = [
- "libc",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "autocfg",
- "rawpointer",
-]
-
 [[package]]
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 checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83faa42c0a078c393f6b29d5db232d8be22776a891f8f56e5284faee4a20b327"
-dependencies = [
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-]
-
-[[package]]
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-dependencies = [
- "libc",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d811f3e15f28568be3407c8e7fdb6514c1cda3cb30683f15b6a1a1dc4ea14a7"
-dependencies = [
- "adler",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7843ec2de400bcbc6a6328c958dc38e5359da6e93e72e37bc5246bf1ae776389"
-
 [[package]]
 name = "must_future"
 version = "0.1.2"
@@ -1365,92 +668,13 @@ dependencies = [
  "pin-utils",
 ]
 
-[[package]]
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-version = "0.27.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "matrixmultiply",
- "nalgebra-macros",
- "num-complex",
- "num-rational",
- "num-traits",
- "rand",
- "rand_distr",
- "simba",
- "typenum",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
-[[package]]
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-dependencies = [
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-]
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-dependencies = [
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-dependencies = [
- "autocfg",
- "num-integer",
- "num-traits",
-]
-
 [[package]]
 name = "num-traits"
-version = "0.2.17"
+version = "0.2.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
 dependencies = [
  "autocfg",
- "libm",
-]
-
-[[package]]
-name = "num_cpus"
-version = "1.16.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
-dependencies = [
- "hermit-abi",
- "libc",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
-dependencies = [
- "memchr",
 ]
 
 [[package]]
@@ -1459,52 +683,12 @@ version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3742b2c103b9f06bc9fff0a37ff4912935851bee6d36f3c02bcc755bcfec228f"
-dependencies = [
- "lock_api",
- "parking_lot_core",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "cfg-if 1.0.0",
- "libc",
- "redox_syscall",
- "smallvec",
- "windows-targets 0.48.5",
-]
-
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
 
-[[package]]
-name = "percent-encoding"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "219c0dcc30b6a27553f9cc242972b67f75b60eb0db71f0b5462f38b058c41546"
-dependencies = [
- "memchr",
- "thiserror",
- "ucd-trie",
-]
-
 [[package]]
 name = "pin-project-lite"
 version = "0.2.13"
@@ -1517,12 +701,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
-[[package]]
-name = "ppv-lite86"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
-
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -1549,33 +727,13 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.78"
+version = "1.0.106"
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 ]
 
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-dependencies = [
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- "quote",
- "syn 1.0.109",
-]
-
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@@ -1586,300 +744,59 @@ dependencies = [
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc33ff2d4973d518d823d61aa239014831e521c75da58e3df4840d3f47749d09"
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- "libc",
- "rand_chacha",
- "rand_core",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.3.1"
+name = "r-efi"
+version = "5.3.0"
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-checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
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-dependencies = [
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+checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
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-checksum = "7f9860a6cc38ed1da53456442089b4dfa35e7cedaa326df63017af88385e6b20"
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 dependencies = [
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- "paste",
 ]
 
 [[package]]
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+version = "1.3.0"
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 checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
 dependencies = [
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+ "semver",
 ]
 
-[[package]]
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-dependencies = [
- "pest",
-]
 
 [[package]]
 name = "serde"
-version = "1.0.166"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d01b7404f9d441d3ad40e6a636a7782c377d2abdbe4fa2440e2edcc2f4f10db8"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
 dependencies = [
+ "serde_core",
  "serde_derive",
 ]
 
@@ -1893,34 +810,32 @@ dependencies = [
 ]
 
 [[package]]
-name = "serde-wasm-bindgen"
-version = "0.4.5"
+name = "serde_bytes"
+version = "0.11.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3b4c031cd0d9014307d82b8abf653c0290fbdaeb4c02d00c63cf52f728628bf"
+checksum = "8b8497c313fd43ab992087548117643f6fcd935cbf36f176ffda0aacf9591734"
 dependencies = [
- "js-sys",
  "serde",
- "wasm-bindgen",
 ]
 
 [[package]]
-name = "serde_bytes"
-version = "0.11.14"
+name = "serde_core"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b8497c313fd43ab992087548117643f6fcd935cbf36f176ffda0aacf9591734"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
 dependencies = [
- "serde",
+ "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.166"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5dd83d6dde2b6b2d466e14d9d1acce8816dedee94f735eac6395808b3483c6d6"
+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.48",
+ "syn 2.0.117",
 ]
 
 [[package]]
@@ -1929,63 +844,22 @@ version = "1.0.109"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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 dependencies = [
- "indexmap 2.2.2",
+ "indexmap",
  "itoa",
- "ryu",
- "serde",
-]
-
-[[package]]
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-version = "0.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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-
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-dependencies = [
- "approx",
- "num-complex",
- "num-traits",
- "paste",
+ "ryu",
+ "serde",
 ]
 
 [[package]]
-name = "simdutf8"
-version = "0.1.4"
+name = "sha2"
+version = "0.10.9"
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-checksum = "f27f6278552951f1f2b8cf9da965d10969b2efdea95a6ec47987ab46edfe263a"
+checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
 
 [[package]]
 name = "slab"
@@ -1997,63 +871,27 @@ dependencies = [
 ]
 
 [[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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-
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-
-[[package]]
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-version = "0.15.0"
+name = "strsim"
+version = "0.11.1"
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-dependencies = [
- "approx",
- "lazy_static",
- "nalgebra",
- "num-traits",
- "rand",
-]
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
-name = "strsim"
-version = "0.10.0"
+name = "strum"
+version = "0.27.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+checksum = "af23d6f6c1a224baef9d3f61e287d2761385a5b88fdab4eb4c6f11aeb54c4bcf"
 
 [[package]]
 name = "strum_macros"
-version = "0.24.3"
+version = "0.27.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e385be0d24f186b4ce2f9982191e7101bb737312ad61c1f2f984f34bcf85d59"
+checksum = "7695ce3845ea4b33927c055a39dc438a45b059f7c1b3d91d38d10355fb8cbca7"
 dependencies = [
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  "proc-macro2",
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-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c2e86926081dda636c546d8c5e641661049d7562a68f5488be4a1f7f66f6086"
-dependencies = [
- "libc",
- "winapi",
+ "syn 2.0.117",
 ]
 
 [[package]]
@@ -2069,136 +907,38 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
 dependencies = [
  "proc-macro2",
- "quote",
  "unicode-ident",
 ]
 
 [[package]]
 name = "syn"
-version = "2.0.48"
+version = "2.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
+checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
 dependencies = [
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  "quote",
  "unicode-ident",
 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
-
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-checksum = "69758bda2e78f098e4ccb393021a0963bb3442eac05f135c30f61b7370bbafae"
-
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-dependencies = [
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-
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-dependencies = [
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-
-[[package]]
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- "windows_x86_64_msvc 0.33.0",
+ "windows-targets",
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+ "windows-targets",
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+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
 
-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.48.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
-
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
 
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.33.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff1e4aa646495048ec7f3ffddc411e1d829c026a2ec62b39da15c1055e406eaa"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.48.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
-
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.52.0"
@@ -2765,10 +1148,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
 
 [[package]]
-name = "wyz"
-version = "0.5.1"
+name = "wit-bindgen"
+version = "0.57.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
-dependencies = [
- "tap",
-]
+checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"
diff --git a/fixture/Cargo.toml b/fixture/Cargo.toml
index 0b7e544..b148984 100644
--- a/fixture/Cargo.toml
+++ b/fixture/Cargo.toml
@@ -6,11 +6,13 @@ opt-level = "z"
 
 [workspace]
 members = ["dnas/*/zomes/coordinator/*", "dnas/*/zomes/integrity/*"]
+resolver = "2"
 
 [workspace.dependencies]
-hdi = "=0.3.5"
-hdk = "=0.2.5"
-serde = "=1.0.166"
+hdi = "=0.7.1"
+hdk = "=0.6.1"
+serde = "1.0"
+holochain_serialized_bytes = "=0.0.57"
 
 [workspace.dependencies.fixture]
 path = "dnas/fixture/zomes/coordinator/fixture"
diff --git a/fixture/dnas/fixture/workdir/dna.yaml b/fixture/dnas/fixture/workdir/dna.yaml
index 7d99b93..9ae5812 100644
--- a/fixture/dnas/fixture/workdir/dna.yaml
+++ b/fixture/dnas/fixture/workdir/dna.yaml
@@ -1,21 +1,15 @@
 ---
-manifest_version: "1"
+manifest_version: "0"
 name: fixture
 integrity:
   network_seed: ~
   properties: ~
-  origin_time: 1707241096195813
   zomes:
     - name: fixture_integrity
-      hash: ~
-      bundled: "../../../target/wasm32-unknown-unknown/release/fixture_integrity.wasm"
-      dependencies: ~
-      dylib: ~
+      path: "../../../target/wasm32-unknown-unknown/release/fixture_integrity.wasm"
 coordinator:
   zomes:
     - name: fixture
-      hash: ~
-      bundled: "../../../target/wasm32-unknown-unknown/release/fixture.wasm"
+      path: "../../../target/wasm32-unknown-unknown/release/fixture.wasm"
       dependencies:
         - name: fixture_integrity
-      dylib: ~
diff --git a/fixture/dnas/fixture/zomes/coordinator/fixture/Cargo.toml b/fixture/dnas/fixture/zomes/coordinator/fixture/Cargo.toml
index bcc2fcf..9777610 100644
--- a/fixture/dnas/fixture/zomes/coordinator/fixture/Cargo.toml
+++ b/fixture/dnas/fixture/zomes/coordinator/fixture/Cargo.toml
@@ -11,5 +11,6 @@ name = "fixture"
 hdk = { workspace = true }
 
 serde = { workspace = true }
+holochain_serialized_bytes = { workspace = true }
 
-fixture_integrity = { workspace = true } 
+fixture_integrity = { workspace = true }
diff --git a/fixture/dnas/fixture/zomes/coordinator/fixture/src/all_fixtures.rs b/fixture/dnas/fixture/zomes/coordinator/fixture/src/all_fixtures.rs
deleted file mode 100644
index 0432876..0000000
--- a/fixture/dnas/fixture/zomes/coordinator/fixture/src/all_fixtures.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-use hdk::prelude::*;
-use fixture_integrity::*;
-#[hdk_extern]
-pub fn get_all_fixtures(_: ()) -> ExternResult<Vec<Link>> {
-    let path = Path::from("all_fixtures");
-    get_links(path.path_entry_hash()?, LinkTypes::AllFixtures, None)
-}
diff --git a/fixture/dnas/fixture/zomes/coordinator/fixture/src/fixture.rs b/fixture/dnas/fixture/zomes/coordinator/fixture/src/fixture.rs
deleted file mode 100644
index c7336ca..0000000
--- a/fixture/dnas/fixture/zomes/coordinator/fixture/src/fixture.rs
+++ /dev/null
@@ -1,182 +0,0 @@
-use hdk::prelude::*;
-use fixture_integrity::*;
-#[hdk_extern]
-pub fn create_fixture(fixture: Fixture) -> ExternResult<Record> {
-    let fixture_hash = create_entry(&EntryTypes::Fixture(fixture.clone()))?;
-    let record = get(fixture_hash.clone(), GetOptions::default())?
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("Could not find the newly created Fixture"))
-            ),
-        )?;
-    let path = Path::from("all_fixtures");
-    create_link(
-        path.path_entry_hash()?,
-        fixture_hash.clone(),
-        LinkTypes::AllFixtures,
-        (),
-    )?;
-    Ok(record)
-}
-#[hdk_extern]
-pub fn get_latest_fixture(
-    original_fixture_hash: ActionHash,
-) -> ExternResult<Option<Record>> {
-    let links = get_links(
-        original_fixture_hash.clone(),
-        LinkTypes::FixtureUpdates,
-        None,
-    )?;
-    let latest_link = links
-        .into_iter()
-        .max_by(|link_a, link_b| link_a.timestamp.cmp(&link_b.timestamp));
-    let latest_fixture_hash = match latest_link {
-        Some(link) => {
-            link.target
-                .clone()
-                .into_action_hash()
-                .ok_or(
-                    wasm_error!(
-                        WasmErrorInner::Guest(String::from("No action hash associated with link"))
-                    ),
-                )?
-        }
-        None => original_fixture_hash.clone(),
-    };
-    get(latest_fixture_hash, GetOptions::default())
-}
-#[hdk_extern]
-pub fn get_original_fixture(
-    original_fixture_hash: ActionHash,
-) -> ExternResult<Option<Record>> {
-    let Some(details) = get_details(original_fixture_hash, GetOptions::default())? else {
-        return Ok(None);
-    };
-    match details {
-        Details::Record(details) => Ok(Some(details.record)),
-        _ => {
-            Err(
-                wasm_error!(
-                    WasmErrorInner::Guest(String::from("Malformed get details response"))
-                ),
-            )
-        }
-    }
-}
-#[hdk_extern]
-pub fn get_all_revisions_for_fixture(
-    original_fixture_hash: ActionHash,
-) -> ExternResult<Vec<Record>> {
-    let Some(original_record) = get_original_fixture(original_fixture_hash.clone())?
-    else {
-        return Ok(vec![]);
-    };
-    let links = get_links(
-        original_fixture_hash.clone(),
-        LinkTypes::FixtureUpdates,
-        None,
-    )?;
-    let get_input: Vec<GetInput> = links
-        .into_iter()
-        .map(|link| Ok(
-            GetInput::new(
-                link
-                    .target
-                    .into_action_hash()
-                    .ok_or(
-                        wasm_error!(
-                            WasmErrorInner::Guest(String::from("No action hash associated with link"))
-                        ),
-                    )?
-                    .into(),
-                GetOptions::default(),
-            ),
-        ))
-        .collect::<ExternResult<Vec<GetInput>>>()?;
-    let records = HDK.with(|hdk| hdk.borrow().get(get_input))?;
-    let mut records: Vec<Record> = records.into_iter().filter_map(|r| r).collect();
-    records.insert(0, original_record);
-    Ok(records)
-}
-#[derive(Serialize, Deserialize, Debug)]
-pub struct UpdateFixtureInput {
-    pub original_fixture_hash: ActionHash,
-    pub previous_fixture_hash: ActionHash,
-    pub updated_fixture: Fixture,
-}
-#[hdk_extern]
-pub fn update_fixture(input: UpdateFixtureInput) -> ExternResult<Record> {
-    let updated_fixture_hash = update_entry(
-        input.previous_fixture_hash.clone(),
-        &input.updated_fixture,
-    )?;
-    create_link(
-        input.original_fixture_hash.clone(),
-        updated_fixture_hash.clone(),
-        LinkTypes::FixtureUpdates,
-        (),
-    )?;
-    let record = get(updated_fixture_hash.clone(), GetOptions::default())?
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("Could not find the newly updated Fixture"))
-            ),
-        )?;
-    Ok(record)
-}
-#[hdk_extern]
-pub fn delete_fixture(original_fixture_hash: ActionHash) -> ExternResult<ActionHash> {
-    let details = get_details(original_fixture_hash.clone(), GetOptions::default())?
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("{pascal_entry_def_name} not found"))
-            ),
-        )?;
-    match details {
-        Details::Record(details) => Ok(details.record),
-        _ => {
-            Err(
-                wasm_error!(
-                    WasmErrorInner::Guest(String::from("Malformed get details response"))
-                ),
-            )
-        }
-    }?;
-    let path = Path::from("all_fixtures");
-    let links = get_links(path.path_entry_hash()?, LinkTypes::AllFixtures, None)?;
-    for link in links {
-        if let Some(hash) = link.target.into_action_hash() {
-            if hash.eq(&original_fixture_hash) {
-                delete_link(link.create_link_hash)?;
-            }
-        }
-    }
-    delete_entry(original_fixture_hash)
-}
-#[hdk_extern]
-pub fn get_all_deletes_for_fixture(
-    original_fixture_hash: ActionHash,
-) -> ExternResult<Option<Vec<SignedActionHashed>>> {
-    let Some(details) = get_details(original_fixture_hash, GetOptions::default())? else {
-        return Ok(None);
-    };
-    match details {
-        Details::Entry(_) => {
-            Err(wasm_error!(WasmErrorInner::Guest("Malformed details".into())))
-        }
-        Details::Record(record_details) => Ok(Some(record_details.deletes)),
-    }
-}
-#[hdk_extern]
-pub fn get_oldest_delete_for_fixture(
-    original_fixture_hash: ActionHash,
-) -> ExternResult<Option<SignedActionHashed>> {
-    let Some(mut deletes) = get_all_deletes_for_fixture(original_fixture_hash)? else {
-        return Ok(None);
-    };
-    deletes
-        .sort_by(|delete_a, delete_b| {
-            delete_a.action().timestamp().cmp(&delete_b.action().timestamp())
-        });
-    Ok(deletes.first().cloned())
-}
diff --git a/fixture/dnas/fixture/zomes/coordinator/fixture/src/lib.rs b/fixture/dnas/fixture/zomes/coordinator/fixture/src/lib.rs
index b4c0e0c..37f607a 100644
--- a/fixture/dnas/fixture/zomes/coordinator/fixture/src/lib.rs
+++ b/fixture/dnas/fixture/zomes/coordinator/fixture/src/lib.rs
@@ -1,147 +1,55 @@
-pub mod all_fixtures;
-pub mod fixture;
-use hdk::prelude::*;
 use fixture_integrity::*;
+use hdk::prelude::*;
+
+/// Create a `Fixture` entry, link it under the `all_fixtures` path, and return
+/// the created `Record`. Exercises `Record`/`Action`/`Entry` decoding.
+#[hdk_extern]
+pub fn create_fixture(fixture: Fixture) -> ExternResult<Record> {
+    let action_hash = create_entry(&EntryTypes::Fixture(fixture.clone()))?;
+    let record = get(action_hash.clone(), GetOptions::default())?.ok_or(wasm_error!(
+        WasmErrorInner::Guest("could not find the newly created Fixture".into())
+    ))?;
+    let path = Path::from("all_fixtures");
+    create_link(
+        path.path_entry_hash()?,
+        action_hash,
+        LinkTypes::AllFixtures,
+        (),
+    )?;
+    Ok(record)
+}
+
+/// Fetch a `Fixture` record by its action hash.
 #[hdk_extern]
-pub fn init(_: ()) -> ExternResult<InitCallbackResult> {
-    Ok(InitCallbackResult::Pass)
+pub fn get_fixture(action_hash: ActionHash) -> ExternResult<Option<Record>> {
+    get(action_hash, GetOptions::default())
+}
+
+/// List all links from the `all_fixtures` path.
+#[hdk_extern]
+pub fn get_all_fixtures(_: ()) -> ExternResult<Vec<Link>> {
+    let path = Path::from("all_fixtures");
+    get_links(
+        LinkQuery::try_new(path.path_entry_hash()?, LinkTypes::AllFixtures)?,
+        GetStrategy::default(),
+    )
 }
+
+/// Echo the input back. The simplest possible round-trip.
+#[hdk_extern]
+pub fn echo(value: String) -> ExternResult<String> {
+    Ok(value)
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(tag = "type")]
 pub enum Signal {
-    LinkCreated { action: SignedActionHashed, link_type: LinkTypes },
-    LinkDeleted {
-        action: SignedActionHashed,
-        create_link_action: SignedActionHashed,
-        link_type: LinkTypes,
-    },
-    EntryCreated { action: SignedActionHashed, app_entry: EntryTypes },
-    EntryUpdated {
-        action: SignedActionHashed,
-        app_entry: EntryTypes,
-        original_app_entry: EntryTypes,
-    },
-    EntryDeleted { action: SignedActionHashed, original_app_entry: EntryTypes },
-}
-#[hdk_extern(infallible)]
-pub fn post_commit(committed_actions: Vec<SignedActionHashed>) {
-    for action in committed_actions {
-        if let Err(err) = signal_action(action) {
-            error!("Error signaling new action: {:?}", err);
-        }
-    }
+    Echo { value: String },
 }
-fn signal_action(action: SignedActionHashed) -> ExternResult<()> {
-    match action.hashed.content.clone() {
-        Action::CreateLink(create_link) => {
-            if let Ok(Some(link_type)) = LinkTypes::from_type(
-                create_link.zome_index,
-                create_link.link_type,
-            ) {
-                emit_signal(Signal::LinkCreated {
-                    action,
-                    link_type,
-                })?;
-            }
-            Ok(())
-        }
-        Action::DeleteLink(delete_link) => {
-            let record = get(
-                    delete_link.link_add_address.clone(),
-                    GetOptions::default(),
-                )?
-                .ok_or(
-                    wasm_error!(
-                        WasmErrorInner::Guest("Failed to fetch CreateLink action"
-                        .to_string())
-                    ),
-                )?;
-            match record.action() {
-                Action::CreateLink(create_link) => {
-                    if let Ok(Some(link_type)) = LinkTypes::from_type(
-                        create_link.zome_index,
-                        create_link.link_type,
-                    ) {
-                        emit_signal(Signal::LinkDeleted {
-                            action,
-                            link_type,
-                            create_link_action: record.signed_action.clone(),
-                        })?;
-                    }
-                    Ok(())
-                }
-                _ => {
-                    return Err(
-                        wasm_error!(
-                            WasmErrorInner::Guest("Create Link should exist".to_string())
-                        ),
-                    );
-                }
-            }
-        }
-        Action::Create(_create) => {
-            if let Ok(Some(app_entry)) = get_entry_for_action(&action.hashed.hash) {
-                emit_signal(Signal::EntryCreated {
-                    action,
-                    app_entry,
-                })?;
-            }
-            Ok(())
-        }
-        Action::Update(update) => {
-            if let Ok(Some(app_entry)) = get_entry_for_action(&action.hashed.hash) {
-                if let Ok(Some(original_app_entry)) = get_entry_for_action(
-                    &update.original_action_address,
-                ) {
-                    emit_signal(Signal::EntryUpdated {
-                        action,
-                        app_entry,
-                        original_app_entry,
-                    })?;
-                }
-            }
-            Ok(())
-        }
-        Action::Delete(delete) => {
-            if let Ok(Some(original_app_entry)) = get_entry_for_action(
-                &delete.deletes_address,
-            ) {
-                emit_signal(Signal::EntryDeleted {
-                    action,
-                    original_app_entry,
-                })?;
-            }
-            Ok(())
-        }
-        _ => Ok(()),
-    }
-}
-fn get_entry_for_action(action_hash: &ActionHash) -> ExternResult<Option<EntryTypes>> {
-    let record = match get_details(action_hash.clone(), GetOptions::default())? {
-        Some(Details::Record(record_details)) => record_details.record,
-        _ => {
-            return Ok(None);
-        }
-    };
-    let entry = match record.entry().as_option() {
-        Some(entry) => entry,
-        None => {
-            return Ok(None);
-        }
-    };
-    let (zome_index, entry_index) = match record.action().entry_type() {
-        Some(EntryType::App(AppEntryDef { zome_index, entry_index, .. })) => {
-            (zome_index, entry_index)
-        }
-        _ => {
-            return Ok(None);
-        }
-    };
-    Ok(
-        EntryTypes::deserialize_from_type(
-            zome_index.clone(),
-            entry_index.clone(),
-            entry,
-        )?,
-    )
+
+/// Emit an app signal so the client can exercise signal delivery.
+#[hdk_extern]
+pub fn emit(value: String) -> ExternResult<()> {
+    emit_signal(Signal::Echo { value })?;
+    Ok(())
 }
diff --git a/fixture/dnas/fixture/zomes/integrity/fixture/Cargo.toml b/fixture/dnas/fixture/zomes/integrity/fixture/Cargo.toml
index 539d971..4dd468e 100644
--- a/fixture/dnas/fixture/zomes/integrity/fixture/Cargo.toml
+++ b/fixture/dnas/fixture/zomes/integrity/fixture/Cargo.toml
@@ -11,3 +11,4 @@ name = "fixture_integrity"
 hdi = { workspace = true }
 
 serde = { workspace = true }
+holochain_serialized_bytes = { workspace = true }
diff --git a/fixture/dnas/fixture/zomes/integrity/fixture/src/fixture.rs b/fixture/dnas/fixture/zomes/integrity/fixture/src/fixture.rs
deleted file mode 100644
index 2a65e4a..0000000
--- a/fixture/dnas/fixture/zomes/integrity/fixture/src/fixture.rs
+++ /dev/null
@@ -1,119 +0,0 @@
-use hdi::prelude::*;
-#[hdk_entry_helper]
-#[derive(Clone, PartialEq)]
-pub struct Fixture {
-    pub name: String,
-}
-pub fn validate_create_fixture(
-    _action: EntryCreationAction,
-    _fixture: Fixture,
-) -> ExternResult<ValidateCallbackResult> {
-    Ok(ValidateCallbackResult::Valid)
-}
-pub fn validate_update_fixture(
-    _action: Update,
-    _fixture: Fixture,
-    _original_action: EntryCreationAction,
-    _original_fixture: Fixture,
-) -> ExternResult<ValidateCallbackResult> {
-    Ok(ValidateCallbackResult::Valid)
-}
-pub fn validate_delete_fixture(
-    _action: Delete,
-    _original_action: EntryCreationAction,
-    _original_fixture: Fixture,
-) -> ExternResult<ValidateCallbackResult> {
-    Ok(ValidateCallbackResult::Valid)
-}
-pub fn validate_create_link_fixture_updates(
-    _action: CreateLink,
-    base_address: AnyLinkableHash,
-    target_address: AnyLinkableHash,
-    _tag: LinkTag,
-) -> ExternResult<ValidateCallbackResult> {
-    let action_hash = base_address
-        .into_action_hash()
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("No action hash associated with link"))
-            ),
-        )?;
-    let record = must_get_valid_record(action_hash)?;
-    let _fixture: crate::Fixture = record
-        .entry()
-        .to_app_option()
-        .map_err(|e| wasm_error!(e))?
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("Linked action must reference an entry"))
-            ),
-        )?;
-    let action_hash = target_address
-        .into_action_hash()
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("No action hash associated with link"))
-            ),
-        )?;
-    let record = must_get_valid_record(action_hash)?;
-    let _fixture: crate::Fixture = record
-        .entry()
-        .to_app_option()
-        .map_err(|e| wasm_error!(e))?
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("Linked action must reference an entry"))
-            ),
-        )?;
-    Ok(ValidateCallbackResult::Valid)
-}
-pub fn validate_delete_link_fixture_updates(
-    _action: DeleteLink,
-    _original_action: CreateLink,
-    _base: AnyLinkableHash,
-    _target: AnyLinkableHash,
-    _tag: LinkTag,
-) -> ExternResult<ValidateCallbackResult> {
-    Ok(
-        ValidateCallbackResult::Invalid(
-            String::from("FixtureUpdates links cannot be deleted"),
-        ),
-    )
-}
-pub fn validate_create_link_all_fixtures(
-    _action: CreateLink,
-    _base_address: AnyLinkableHash,
-    target_address: AnyLinkableHash,
-    _tag: LinkTag,
-) -> ExternResult<ValidateCallbackResult> {
-    // Check the entry type for the given action hash
-    let action_hash = target_address
-        .into_action_hash()
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("No action hash associated with link"))
-            ),
-        )?;
-    let record = must_get_valid_record(action_hash)?;
-    let _fixture: crate::Fixture = record
-        .entry()
-        .to_app_option()
-        .map_err(|e| wasm_error!(e))?
-        .ok_or(
-            wasm_error!(
-                WasmErrorInner::Guest(String::from("Linked action must reference an entry"))
-            ),
-        )?;
-    // TODO: add the appropriate validation rules
-    Ok(ValidateCallbackResult::Valid)
-}
-pub fn validate_delete_link_all_fixtures(
-    _action: DeleteLink,
-    _original_action: CreateLink,
-    _base: AnyLinkableHash,
-    _target: AnyLinkableHash,
-    _tag: LinkTag,
-) -> ExternResult<ValidateCallbackResult> {
-    // TODO: add the appropriate validation rules
-    Ok(ValidateCallbackResult::Valid)
-}
diff --git a/fixture/dnas/fixture/zomes/integrity/fixture/src/lib.rs b/fixture/dnas/fixture/zomes/integrity/fixture/src/lib.rs
index 0719a1b..313f6e9 100644
--- a/fixture/dnas/fixture/zomes/integrity/fixture/src/lib.rs
+++ b/fixture/dnas/fixture/zomes/integrity/fixture/src/lib.rs
@@ -1,380 +1,32 @@
-pub mod fixture;
-pub use fixture::*;
 use hdi::prelude::*;
-#[derive(Serialize, Deserialize)]
-#[serde(tag = "type")]
-#[hdk_entry_defs]
+
+/// A trivial app entry used by the client test-suite to exercise zome calls
+/// and `Record`/`Action`/`Entry` deserialization.
+#[hdk_entry_helper]
+#[derive(Clone, PartialEq)]
+pub struct Fixture {
+    pub value: String,
+}
+
+#[hdk_entry_types]
 #[unit_enum(UnitEntryTypes)]
 pub enum EntryTypes {
+    #[entry_type(visibility = "public")]
     Fixture(Fixture),
 }
-#[derive(Serialize, Deserialize)]
+
 #[hdk_link_types]
 pub enum LinkTypes {
-    FixtureUpdates,
     AllFixtures,
+    FixtureUpdates,
 }
+
 #[hdk_extern]
-pub fn genesis_self_check(
-    _data: GenesisSelfCheckData,
-) -> ExternResult<ValidateCallbackResult> {
-    Ok(ValidateCallbackResult::Valid)
-}
-pub fn validate_agent_joining(
-    _agent_pub_key: AgentPubKey,
-    _membrane_proof: &Option<MembraneProof>,
-) -> ExternResult<ValidateCallbackResult> {
+pub fn genesis_self_check(_: GenesisSelfCheckData) -> ExternResult<ValidateCallbackResult> {
     Ok(ValidateCallbackResult::Valid)
 }
+
 #[hdk_extern]
-pub fn validate(op: Op) -> ExternResult<ValidateCallbackResult> {
-    match op.flattened::<EntryTypes, LinkTypes>()? {
-        FlatOp::StoreEntry(store_entry) => {
-            match store_entry {
-                OpEntry::CreateEntry { app_entry, action } => {
-                    match app_entry {
-                        EntryTypes::Fixture(fixture) => {
-                            validate_create_fixture(
-                                EntryCreationAction::Create(action),
-                                fixture,
-                            )
-                        }
-                    }
-                }
-                OpEntry::UpdateEntry { app_entry, action, .. } => {
-                    match app_entry {
-                        EntryTypes::Fixture(fixture) => {
-                            validate_create_fixture(
-                                EntryCreationAction::Update(action),
-                                fixture,
-                            )
-                        }
-                    }
-                }
-                _ => Ok(ValidateCallbackResult::Valid),
-            }
-        }
-        FlatOp::RegisterUpdate(update_entry) => {
-            match update_entry {
-                OpUpdate::Entry {
-                    original_action,
-                    original_app_entry,
-                    app_entry,
-                    action,
-                } => {
-                    match (app_entry, original_app_entry) {
-                        (
-                            EntryTypes::Fixture(fixture),
-                            EntryTypes::Fixture(original_fixture),
-                        ) => {
-                            validate_update_fixture(
-                                action,
-                                fixture,
-                                original_action,
-                                original_fixture,
-                            )
-                        }
-                    }
-                }
-                _ => Ok(ValidateCallbackResult::Valid),
-            }
-        }
-        FlatOp::RegisterDelete(delete_entry) => {
-            match delete_entry {
-                OpDelete::Entry { original_action, original_app_entry, action } => {
-                    match original_app_entry {
-                        EntryTypes::Fixture(fixture) => {
-                            validate_delete_fixture(action, original_action, fixture)
-                        }
-                    }
-                }
-                _ => Ok(ValidateCallbackResult::Valid),
-            }
-        }
-        FlatOp::RegisterCreateLink {
-            link_type,
-            base_address,
-            target_address,
-            tag,
-            action,
-        } => {
-            match link_type {
-                LinkTypes::FixtureUpdates => {
-                    validate_create_link_fixture_updates(
-                        action,
-                        base_address,
-                        target_address,
-                        tag,
-                    )
-                }
-                LinkTypes::AllFixtures => {
-                    validate_create_link_all_fixtures(
-                        action,
-                        base_address,
-                        target_address,
-                        tag,
-                    )
-                }
-            }
-        }
-        FlatOp::RegisterDeleteLink {
-            link_type,
-            base_address,
-            target_address,
-            tag,
-            original_action,
-            action,
-        } => {
-            match link_type {
-                LinkTypes::FixtureUpdates => {
-                    validate_delete_link_fixture_updates(
-                        action,
-                        original_action,
-                        base_address,
-                        target_address,
-                        tag,
-                    )
-                }
-                LinkTypes::AllFixtures => {
-                    validate_delete_link_all_fixtures(
-                        action,
-                        original_action,
-                        base_address,
-                        target_address,
-                        tag,
-                    )
-                }
-            }
-        }
-        FlatOp::StoreRecord(store_record) => {
-            match store_record {
-                OpRecord::CreateEntry { app_entry, action } => {
-                    match app_entry {
-                        EntryTypes::Fixture(fixture) => {
-                            validate_create_fixture(
-                                EntryCreationAction::Create(action),
-                                fixture,
-                            )
-                        }
-                    }
-                }
-                OpRecord::UpdateEntry {
-                    original_action_hash,
-                    app_entry,
-                    action,
-                    ..
-                } => {
-                    let original_record = must_get_valid_record(original_action_hash)?;
-                    let original_action = original_record.action().clone();
-                    let original_action = match original_action {
-                        Action::Create(create) => EntryCreationAction::Create(create),
-                        Action::Update(update) => EntryCreationAction::Update(update),
-                        _ => {
-                            return Ok(
-                                ValidateCallbackResult::Invalid(
-                                    "Original action for an update must be a Create or Update action"
-                                        .to_string(),
-                                ),
-                            );
-                        }
-                    };
-                    match app_entry {
-                        EntryTypes::Fixture(fixture) => {
-                            let result = validate_create_fixture(
-                                EntryCreationAction::Update(action.clone()),
-                                fixture.clone(),
-                            )?;
-                            if let ValidateCallbackResult::Valid = result {
-                                let original_fixture: Option<Fixture> = original_record
-                                    .entry()
-                                    .to_app_option()
-                                    .map_err(|e| wasm_error!(e))?;
-                                let original_fixture = match original_fixture {
-                                    Some(fixture) => fixture,
-                                    None => {
-                                        return Ok(
-                                            ValidateCallbackResult::Invalid(
-                                                "The updated entry type must be the same as the original entry type"
-                                                    .to_string(),
-                                            ),
-                                        );
-                                    }
-                                };
-                                validate_update_fixture(
-                                    action,
-                                    fixture,
-                                    original_action,
-                                    original_fixture,
-                                )
-                            } else {
-                                Ok(result)
-                            }
-                        }
-                    }
-                }
-                OpRecord::DeleteEntry { original_action_hash, action, .. } => {
-                    let original_record = must_get_valid_record(original_action_hash)?;
-                    let original_action = original_record.action().clone();
-                    let original_action = match original_action {
-                        Action::Create(create) => EntryCreationAction::Create(create),
-                        Action::Update(update) => EntryCreationAction::Update(update),
-                        _ => {
-                            return Ok(
-                                ValidateCallbackResult::Invalid(
-                                    "Original action for a delete must be a Create or Update action"
-                                        .to_string(),
-                                ),
-                            );
-                        }
-                    };
-                    let app_entry_type = match original_action.entry_type() {
-                        EntryType::App(app_entry_type) => app_entry_type,
-                        _ => {
-                            return Ok(ValidateCallbackResult::Valid);
-                        }
-                    };
-                    let entry = match original_record.entry().as_option() {
-                        Some(entry) => entry,
-                        None => {
-                            if original_action.entry_type().visibility().is_public() {
-                                return Ok(
-                                    ValidateCallbackResult::Invalid(
-                                        "Original record for a delete of a public entry must contain an entry"
-                                            .to_string(),
-                                    ),
-                                );
-                            } else {
-                                return Ok(ValidateCallbackResult::Valid);
-                            }
-                        }
-                    };
-                    let original_app_entry = match EntryTypes::deserialize_from_type(
-                        app_entry_type.zome_index.clone(),
-                        app_entry_type.entry_index.clone(),
-                        &entry,
-                    )? {
-                        Some(app_entry) => app_entry,
-                        None => {
-                            return Ok(
-                                ValidateCallbackResult::Invalid(
-                                    "Original app entry must be one of the defined entry types for this zome"
-                                        .to_string(),
-                                ),
-                            );
-                        }
-                    };
-                    match original_app_entry {
-                        EntryTypes::Fixture(original_fixture) => {
-                            validate_delete_fixture(
-                                action,
-                                original_action,
-                                original_fixture,
-                            )
-                        }
-                    }
-                }
-                OpRecord::CreateLink {
-                    base_address,
-                    target_address,
-                    tag,
-                    link_type,
-                    action,
-                } => {
-                    match link_type {
-                        LinkTypes::FixtureUpdates => {
-                            validate_create_link_fixture_updates(
-                                action,
-                                base_address,
-                                target_address,
-                                tag,
-                            )
-                        }
-                        LinkTypes::AllFixtures => {
-                            validate_create_link_all_fixtures(
-                                action,
-                                base_address,
-                                target_address,
-                                tag,
-                            )
-                        }
-                    }
-                }
-                OpRecord::DeleteLink { original_action_hash, base_address, action } => {
-                    let record = must_get_valid_record(original_action_hash)?;
-                    let create_link = match record.action() {
-                        Action::CreateLink(create_link) => create_link.clone(),
-                        _ => {
-                            return Ok(
-                                ValidateCallbackResult::Invalid(
-                                    "The action that a DeleteLink deletes must be a CreateLink"
-                                        .to_string(),
-                                ),
-                            );
-                        }
-                    };
-                    let link_type = match LinkTypes::from_type(
-                        create_link.zome_index.clone(),
-                        create_link.link_type.clone(),
-                    )? {
-                        Some(lt) => lt,
-                        None => {
-                            return Ok(ValidateCallbackResult::Valid);
-                        }
-                    };
-                    match link_type {
-                        LinkTypes::FixtureUpdates => {
-                            validate_delete_link_fixture_updates(
-                                action,
-                                create_link.clone(),
-                                base_address,
-                                create_link.target_address,
-                                create_link.tag,
-                            )
-                        }
-                        LinkTypes::AllFixtures => {
-                            validate_delete_link_all_fixtures(
-                                action,
-                                create_link.clone(),
-                                base_address,
-                                create_link.target_address,
-                                create_link.tag,
-                            )
-                        }
-                    }
-                }
-                OpRecord::CreatePrivateEntry { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::UpdatePrivateEntry { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::CreateCapClaim { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::CreateCapGrant { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::UpdateCapClaim { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::UpdateCapGrant { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::Dna { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::OpenChain { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::CloseChain { .. } => Ok(ValidateCallbackResult::Valid),
-                OpRecord::InitZomesComplete { .. } => Ok(ValidateCallbackResult::Valid),
-                _ => Ok(ValidateCallbackResult::Valid),
-            }
-        }
-        FlatOp::RegisterAgentActivity(agent_activity) => {
-            match agent_activity {
-                OpActivity::CreateAgent { agent, action } => {
-                    let previous_action = must_get_action(action.prev_action)?;
-                    match previous_action.action() {
-                        Action::AgentValidationPkg(
-                            AgentValidationPkg { membrane_proof, .. },
-                        ) => validate_agent_joining(agent, membrane_proof),
-                        _ => {
-                            Ok(
-                                ValidateCallbackResult::Invalid(
-                                    "The previous action for a `CreateAgent` action must be an `AgentValidationPkg`"
-                                        .to_string(),
-                                ),
-                            )
-                        }
-                    }
-                }
-                _ => Ok(ValidateCallbackResult::Valid),
-            }
-        }
-    }
+pub fn validate(_op: Op) -> ExternResult<ValidateCallbackResult> {
+    Ok(ValidateCallbackResult::Valid)
 }
diff --git a/fixture/package.json b/fixture/package.json
index af8eb4e..512357b 100644
--- a/fixture/package.json
+++ b/fixture/package.json
@@ -3,7 +3,7 @@
   "private": true,
   "scripts": {
     "build:happ": "npm run build:zomes && hc app pack workdir --recursive",
-    "build:zomes": "RUSTFLAGS='' CARGO_TARGET_DIR=target cargo build --release --target wasm32-unknown-unknown"
+    "build:zomes": "RUSTFLAGS='--cfg getrandom_backend=\"custom\"' CARGO_TARGET_DIR=target cargo build --release --target wasm32-unknown-unknown"
   },
   "engines": {
     "npm": ">=7.0.0"
diff --git a/fixture/workdir/happ.yaml b/fixture/workdir/happ.yaml
index 88750dd..bbf6484 100644
--- a/fixture/workdir/happ.yaml
+++ b/fixture/workdir/happ.yaml
@@ -1,5 +1,5 @@
 ---
-manifest_version: "1"
+manifest_version: "0"
 name: fixture
 description: ~
 roles:
@@ -8,11 +8,9 @@ roles:
       strategy: create
       deferred: false
     dna:
-      bundled: "../dnas/fixture/workdir/fixture.dna"
+      path: "../dnas/fixture/workdir/fixture.dna"
       modifiers:
         network_seed: ~
         properties: ~
-        origin_time: ~
-        quantum_time: ~
       installed_hash: ~
       clone_limit: 0
diff --git a/fixture/workdir/web-happ.yaml b/fixture/workdir/web-happ.yaml
deleted file mode 100644
index de58ce8..0000000
--- a/fixture/workdir/web-happ.yaml
+++ /dev/null
@@ -1,7 +0,0 @@
----
-manifest_version: "1"
-name: fixture
-ui:
-  bundled: "../ui/dist.zip"
-happ_manifest:
-  bundled: "./fixture.happ"
diff --git a/flake.lock b/flake.lock
index 2c6f447..84d2606 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,52 +1,12 @@
 {
   "nodes": {
-    "cargo-chef": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1695999026,
-        "narHash": "sha256-UtLoZd7YBRSF9uXStfC3geEFqSqZXFh1rLHaP8hre0Y=",
-        "owner": "LukeMathWalker",
-        "repo": "cargo-chef",
-        "rev": "6e96ae5cd023b718ae40d608981e50a6e7d7facf",
-        "type": "github"
-      },
-      "original": {
-        "owner": "LukeMathWalker",
-        "ref": "main",
-        "repo": "cargo-chef",
-        "type": "github"
-      }
-    },
-    "cargo-rdme": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1675118998,
-        "narHash": "sha256-lrYWqu3h88fr8gG3Yo5GbFGYaq5/1Os7UtM+Af0Bg4k=",
-        "owner": "orium",
-        "repo": "cargo-rdme",
-        "rev": "f9dbb6bccc078f4869f45ae270a2890ac9a75877",
-        "type": "github"
-      },
-      "original": {
-        "owner": "orium",
-        "ref": "v1.1.0",
-        "repo": "cargo-rdme",
-        "type": "github"
-      }
-    },
     "crane": {
-      "inputs": {
-        "nixpkgs": [
-          "holochain",
-          "nixpkgs"
-        ]
-      },
       "locked": {
-        "lastModified": 1707363936,
-        "narHash": "sha256-QbqyvGFYt84QNOQLOOTWplZZkzkyDhYrAl/N/9H0vFM=",
+        "lastModified": 1778106249,
+        "narHash": "sha256-cM/AuKy5tMhwOOQIbha8ZRRMHVfNf7cv2aljIw+qoCg=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "9107434eda6991e9388ad87b815dafa337446d16",
+        "rev": "6d015ea29630b7ad2402841386da2cb617a470a7",
         "type": "github"
       },
       "original": {
@@ -55,288 +15,175 @@
         "type": "github"
       }
     },
-    "crate2nix": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1706909251,
-        "narHash": "sha256-T7G9Uhh77P0kKri/u+Mwa/4YnXwdPsJSwYCiJCCW+fs=",
-        "owner": "kolloch",
-        "repo": "crate2nix",
-        "rev": "15656bb6cb15f55ee3344bf4362e6489feb93db6",
-        "type": "github"
-      },
-      "original": {
-        "owner": "kolloch",
-        "repo": "crate2nix",
-        "type": "github"
-      }
-    },
-    "empty": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1683792623,
-        "narHash": "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=",
-        "owner": "steveej",
-        "repo": "empty",
-        "rev": "8e328e450e4cd32e072eba9e99fe92cf2a1ef5cf",
-        "type": "github"
-      },
-      "original": {
-        "owner": "steveej",
-        "repo": "empty",
-        "type": "github"
-      }
-    },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1696426674,
-        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": "nixpkgs-lib"
       },
       "locked": {
-        "lastModified": 1706830856,
-        "narHash": "sha256-a0NYyp+h9hlb7ddVz4LUn1vT/PLwqfrWYcHMvFB1xYg=",
+        "lastModified": 1778716662,
+        "narHash": "sha256-m1Yf0wZ8j1OHjTc2UwHwyQRSnNeSgLJOd7q5Y45hzi4=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "b253292d9c0a5ead9bc98c4e9a26c6312e27d69f",
-        "type": "github"
-      },
-      "original": {
-        "id": "flake-parts",
-        "type": "indirect"
-      }
-    },
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "rev": "f7c1a2d347e4c52d5fb8d10cb4d94b5884e546fb",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
         "type": "github"
       }
     },
-    "holochain": {
-      "inputs": {
-        "cargo-chef": "cargo-chef",
-        "cargo-rdme": "cargo-rdme",
-        "crane": "crane",
-        "crate2nix": "crate2nix",
-        "empty": "empty",
-        "flake-compat": "flake-compat",
-        "flake-parts": "flake-parts",
-        "holochain": [
-          "holochain",
-          "empty"
-        ],
-        "lair": [
-          "holochain",
-          "empty"
-        ],
-        "launcher": [
-          "holochain",
-          "empty"
-        ],
-        "nix-filter": "nix-filter",
-        "nixpkgs": "nixpkgs",
-        "pre-commit-hooks-nix": "pre-commit-hooks-nix",
-        "repo-git": "repo-git",
-        "rust-overlay": "rust-overlay",
-        "scaffolding": [
-          "holochain",
-          "empty"
-        ],
-        "versions": [
-          "versions"
-        ]
-      },
+    "hc-scaffold": {
+      "flake": false,
       "locked": {
-        "lastModified": 1707719563,
-        "narHash": "sha256-bECQ40ecjglVRKuYJwyr775ZsFJYh7a6kZN3eozJLMc=",
+        "lastModified": 1778884165,
+        "narHash": "sha256-3ANE+PjAGqF5SE59L8ZWLBwD0WxEBik/nWct9c9rSvE=",
         "owner": "holochain",
-        "repo": "holochain",
-        "rev": "76f48f1964100ecd10372f6ad57e4698354bc80f",
+        "repo": "scaffolding",
+        "rev": "c51df16be0498bd499fd0c82445d6cadadd7ccb4",
         "type": "github"
       },
       "original": {
         "owner": "holochain",
-        "repo": "holochain",
+        "ref": "v0.601.1",
+        "repo": "scaffolding",
         "type": "github"
       }
     },
-    "holochain_2": {
+    "holochain": {
       "flake": false,
       "locked": {
-        "lastModified": 1707245081,
-        "narHash": "sha256-l9WHMlD9IDuEv/N/3WDCsP3XLUUnZFrOBEZjbWnC+/Y=",
+        "lastModified": 1778596880,
+        "narHash": "sha256-uUJZkeqBAZgXtDf0juCRpKOUO3yY1gWEKWGqatWcVjY=",
         "owner": "holochain",
         "repo": "holochain",
-        "rev": "0a3b2408b2d6482b913b9f0faf58a39b567f763a",
+        "rev": "3bdeaccd1c54fa351e76f7347601dfbc061d5bd4",
         "type": "github"
       },
       "original": {
         "owner": "holochain",
-        "ref": "holochain-0.2.6",
+        "ref": "holochain-0.6.1",
         "repo": "holochain",
         "type": "github"
       }
     },
-    "lair": {
-      "flake": false,
+    "holonix": {
+      "inputs": {
+        "crane": "crane",
+        "flake-parts": "flake-parts",
+        "hc-scaffold": "hc-scaffold",
+        "holochain": "holochain",
+        "kitsune2": "kitsune2",
+        "lair-keystore": "lair-keystore",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      },
       "locked": {
-        "lastModified": 1706550351,
-        "narHash": "sha256-psVjtb+zj0pZnHTj1xNP2pGBd5Ua1cSwdOAdYdUe3yQ=",
+        "lastModified": 1778884233,
+        "narHash": "sha256-qDQMAQwQm6ZBL+hYejJU0p0GO7aP/UwVwto61jC5QYc=",
         "owner": "holochain",
-        "repo": "lair",
-        "rev": "b11e65eff11c8ac3bf938607946f5c7201298a65",
+        "repo": "holonix",
+        "rev": "5e41693a5f4451e93be1c347a5dd9dafd5e216e5",
         "type": "github"
       },
       "original": {
         "owner": "holochain",
-        "ref": "lair_keystore-v0.4.2",
-        "repo": "lair",
+        "ref": "main-0.6",
+        "repo": "holonix",
         "type": "github"
       }
     },
-    "launcher": {
+    "kitsune2": {
       "flake": false,
       "locked": {
-        "lastModified": 1684183666,
-        "narHash": "sha256-rOE/W/BBYyZKOyypKb8X9Vpc4ty1TNRoI/fV5+01JPw=",
+        "lastModified": 1778073766,
+        "narHash": "sha256-/hG+/9VlZiC1u/UASbIOH0oeiUmKlzqvur++CWSVAbQ=",
         "owner": "holochain",
-        "repo": "launcher",
-        "rev": "75ecdd0aa191ed830cc209a984a6030e656042ff",
+        "repo": "kitsune2",
+        "rev": "b33fa55606f8bd5020cffacf1ffae41f92d4d296",
         "type": "github"
       },
       "original": {
         "owner": "holochain",
-        "ref": "holochain-0.2",
-        "repo": "launcher",
+        "ref": "v0.4.1",
+        "repo": "kitsune2",
         "type": "github"
       }
     },
-    "nix-filter": {
+    "lair-keystore": {
+      "flake": false,
       "locked": {
-        "lastModified": 1705332318,
-        "narHash": "sha256-kcw1yFeJe9N4PjQji9ZeX47jg0p9A0DuU4djKvg1a7I=",
-        "owner": "numtide",
-        "repo": "nix-filter",
-        "rev": "3449dc925982ad46246cfc36469baf66e1b64f17",
+        "lastModified": 1759147598,
+        "narHash": "sha256-K8TkVlKAwS7uuSZC46oSHddtZTM2XGWUTNnjjYdC1bE=",
+        "owner": "holochain",
+        "repo": "lair",
+        "rev": "8aa9ab1468e82a8bfb9bf1e65762efc51659d306",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "nix-filter",
+        "owner": "holochain",
+        "ref": "v0.6.3",
+        "repo": "lair",
         "type": "github"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1707268954,
-        "narHash": "sha256-2en1kvde3cJVc3ZnTy8QeD2oKcseLFjYPLKhIGDanQ0=",
-        "owner": "NixOS",
+        "lastModified": 1778430510,
+        "narHash": "sha256-Ti+ZBvW6yrWWAg2szExVTwCd4qOJ3KlVr1tFHfyfi8Q=",
+        "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "f8e2ebd66d097614d51a56a755450d4ae1632df1",
+        "rev": "8fd9daa3db09ced9700431c5b7ad0e8ba199b575",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-unstable",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs-lib": {
-      "locked": {
-        "dir": "lib",
-        "lastModified": 1706550542,
-        "narHash": "sha256-UcsnCG6wx++23yeER4Hg18CXWbgNpqNXcHIo5/1Y+hc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "97b17f32362e475016f942bbdfda4a4a72a8a652",
-        "type": "github"
-      },
-      "original": {
-        "dir": "lib",
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
+        "owner": "nixos",
+        "ref": "nixos-25.11",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
-    "pre-commit-hooks-nix": {
-      "flake": false,
+    "nixpkgs-lib": {
       "locked": {
-        "lastModified": 1707297608,
-        "narHash": "sha256-ADjo/5VySGlvtCW3qR+vdFF4xM9kJFlRDqcC9ZGI8EA=",
-        "owner": "cachix",
-        "repo": "pre-commit-hooks.nix",
-        "rev": "0db2e67ee49910adfa13010e7f012149660af7f0",
+        "lastModified": 1777168982,
+        "narHash": "sha256-GOkGPcboWE9BmGCRMLX3worL4EMnsnG8MyKmXNeYuhQ=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "f5901329dade4a6ea039af1433fb087bd9c1fe14",
         "type": "github"
       },
       "original": {
-        "owner": "cachix",
-        "repo": "pre-commit-hooks.nix",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
         "type": "github"
       }
     },
-    "repo-git": {
-      "flake": false,
-      "locked": {
-        "narHash": "sha256-d6xi4mKdjkX2JFicDIv5niSzpyI0m/Hnm8GGAIU04kY=",
-        "type": "file",
-        "url": "file:/dev/null"
-      },
-      "original": {
-        "type": "file",
-        "url": "file:/dev/null"
-      }
-    },
     "root": {
       "inputs": {
-        "holochain": "holochain",
+        "flake-parts": [
+          "holonix",
+          "flake-parts"
+        ],
+        "holonix": "holonix",
         "nixpkgs": [
-          "holochain",
+          "holonix",
           "nixpkgs"
-        ],
-        "versions": "versions"
+        ]
       }
     },
     "rust-overlay": {
       "inputs": {
-        "flake-utils": "flake-utils",
         "nixpkgs": [
-          "holochain",
+          "holonix",
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1707703915,
-        "narHash": "sha256-Vej69igzNr3eVDca6+32uO+TXjVWx6ZUwwy3iZuzhJ4=",
+        "lastModified": 1778728594,
+        "narHash": "sha256-+gIOsOzqWNfn+ThCXBQGcLHVEnaGQW59XjghE9JUIYk=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "e6679d2ff9136d00b3a7168d2bf1dff9e84c5758",
+        "rev": "83a17ebffcfacb17b49e1b5e9dc15eed07936648",
         "type": "github"
       },
       "original": {
@@ -344,61 +191,6 @@
         "repo": "rust-overlay",
         "type": "github"
       }
-    },
-    "scaffolding": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1705076186,
-        "narHash": "sha256-O914XeBuFulky5RqTOvsog+fbO12v0ppW+mIdO6lvKU=",
-        "owner": "holochain",
-        "repo": "scaffolding",
-        "rev": "42e025fe23ac0b4cd659d95e6752d2d300a8d076",
-        "type": "github"
-      },
-      "original": {
-        "owner": "holochain",
-        "ref": "holochain-0.2",
-        "repo": "scaffolding",
-        "type": "github"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "versions": {
-      "inputs": {
-        "holochain": "holochain_2",
-        "lair": "lair",
-        "launcher": "launcher",
-        "scaffolding": "scaffolding"
-      },
-      "locked": {
-        "dir": "versions/0_2",
-        "lastModified": 1707719563,
-        "narHash": "sha256-bECQ40ecjglVRKuYJwyr775ZsFJYh7a6kZN3eozJLMc=",
-        "owner": "holochain",
-        "repo": "holochain",
-        "rev": "76f48f1964100ecd10372f6ad57e4698354bc80f",
-        "type": "github"
-      },
-      "original": {
-        "dir": "versions/0_2",
-        "owner": "holochain",
-        "repo": "holochain",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 24ad91b..a9e3f70 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,36 +1,29 @@
 {
-    description = "Flake for Holochain client development";
+    description = "Flake for Holochain client development (Holochain 0.6)";
 
     inputs = {
-        versions.url = "github:holochain/holochain?dir=versions/0_2";
+        holonix.url = "github:holochain/holonix?ref=main-0.6";
 
-        versions.inputs.holochain.url = "github:holochain/holochain/holochain-0.2.6";
-
-        holochain = {
-            url = "github:holochain/holochain";
-            inputs.versions.follows = "versions";
-        };
-
-        nixpkgs.follows = "holochain/nixpkgs";
+        nixpkgs.follows = "holonix/nixpkgs";
+        flake-parts.follows = "holonix/flake-parts";
     };
 
-    outputs = inputs @ { ... }:
-    inputs.holochain.inputs.flake-parts.lib.mkFlake { inherit inputs; }
+    outputs = inputs @ { flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; }
     {
-        systems = builtins.attrNames inputs.holochain.devShells;
-        perSystem = { config, pkgs, system, ... }: {
+        systems = builtins.attrNames inputs.holonix.devShells;
+        perSystem = { inputs', pkgs, system, ... }: {
             devShells.default = pkgs.mkShell {
-                inputsFrom = [
-                    inputs.holochain.devShells.${system}.holonix
-                ];
-                packages = [
-                    (pkgs.python3.withPackages (python-pkgs: [
-                        python-pkgs.pip
-                        python-pkgs.poetry-core
-                    ]))
-                    pkgs.poetry
-                    pkgs.nodejs_20
-                ];
+                packages = (with inputs'.holonix.packages; [
+                    holochain
+                    hc
+                    lair-keystore
+                    rust # Rust toolchain with the wasm32 target for building zomes
+                ]) ++ (with pkgs; [
+                    (python3.withPackages (ps: [ ps.pip ps.poetry-core ]))
+                    poetry
+                    nodejs_20
+                ]);
             };
         };
     };
diff --git a/holochain_client/__init__.py b/holochain_client/__init__.py
index e69de29..36ddef1 100644
--- a/holochain_client/__init__.py
+++ b/holochain_client/__init__.py
@@ -0,0 +1,59 @@
+"""A Python client for the Holochain Conductor API (Holochain 0.6)."""
+
+from __future__ import annotations
+
+from .admin import AdminClient
+from .app import AppClient, AppSignal
+from ._transport import ConductorError
+from .hash import (
+    ActionHash,
+    AgentPubKey,
+    DnaHash,
+    EntryHash,
+    ExternalHash,
+    HoloHash,
+    WasmHash,
+)
+from .signing import SigningCredentials, SigningKeyPair
+from .types.app import AppInfo, AppStatus
+from .types.cell import CellId, ClonedCell, DnaModifiers, ProvisionedCell
+from .types.record import (
+    Action,
+    Entry,
+    Record,
+    RecordEntry,
+    decode_record,
+    decode_records,
+)
+from .admin.types import AppBundleBytes, AppBundlePath, AppBundleSource
+
+__all__ = [
+    "AdminClient",
+    "AppClient",
+    "AppSignal",
+    "AppInfo",
+    "AppStatus",
+    "AppBundleBytes",
+    "AppBundlePath",
+    "AppBundleSource",
+    "Action",
+    "CellId",
+    "ClonedCell",
+    "ConductorError",
+    "DnaModifiers",
+    "Entry",
+    "ProvisionedCell",
+    "Record",
+    "RecordEntry",
+    "decode_record",
+    "decode_records",
+    "SigningCredentials",
+    "SigningKeyPair",
+    "ActionHash",
+    "AgentPubKey",
+    "DnaHash",
+    "EntryHash",
+    "ExternalHash",
+    "HoloHash",
+    "WasmHash",
+]
diff --git a/holochain_client/_api.py b/holochain_client/_api.py
new file mode 100644
index 0000000..d53b429
--- /dev/null
+++ b/holochain_client/_api.py
@@ -0,0 +1,52 @@
+"""Shared request/response envelope handling for the admin and app clients."""
+
+from __future__ import annotations
+
+from typing import Any, Optional
+
+from ._transport import ConductorError, WebsocketConnection
+from .serde import decode, encode
+
+
+class ApiClient:
+    """Wraps a :class:`WebsocketConnection` with the conductor's request and
+    response envelope (``{"type": <variant>, "value": <content>}``) and turns
+    ``error`` responses into :class:`ConductorError`."""
+
+    def __init__(self, connection: WebsocketConnection):
+        self._connection = connection
+
+    async def _send(
+        self,
+        request_type: str,
+        value: Any = None,
+        *,
+        response_type: Any = None,
+        expect: Optional[str] = None,
+    ) -> Any:
+        request: dict[str, Any] = {"type": request_type}
+        if value is not None:
+            request["value"] = encode(value)
+        response = await self._connection.request(request)
+
+        kind = response.get("type")
+        content = response.get("value")
+        if kind == "error":
+            raise _to_error(content)
+        if expect is not None and kind != expect:
+            raise ConductorError(
+                f"unexpected response {kind!r} to {request_type!r}: {content!r}"
+            )
+        return decode(content, response_type)
+
+    async def close(self) -> None:
+        await self._connection.close()
+
+
+def _to_error(content: Any) -> ConductorError:
+    """Turn an ``ExternalApiWireError`` payload into an exception."""
+    if isinstance(content, dict) and "type" in content:
+        kind = content["type"]
+        message = content.get("value")
+        return ConductorError(f"{kind}: {message}")
+    return ConductorError(str(content))
diff --git a/holochain_client/_transport.py b/holochain_client/_transport.py
new file mode 100644
index 0000000..b47ff89
--- /dev/null
+++ b/holochain_client/_transport.py
@@ -0,0 +1,116 @@
+"""Low-level WebSocket transport for the Holochain conductor API.
+
+Handles the ``holochain_websocket`` wire framing — an outer msgpack map
+``{"type": "request"|"response"|"signal"|"authenticate", "id"?, "data": <bin>}``
+where ``data`` is the msgpack-encoded inner payload — plus request/response
+correlation by id and dispatch of unsolicited signals.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import itertools
+from typing import Any, Callable, Optional
+
+import msgpack
+from websockets.asyncio.client import connect as ws_connect
+from websockets.exceptions import ConnectionClosed
+
+# Conductor websockets reject connections without an Origin header. The value is
+# only meaningful when the interface restricts allowed origins.
+DEFAULT_ORIGIN = "holochain-client-python"
+
+SignalHandler = Callable[[bytes], Any]
+
+
+class ConductorError(Exception):
+    """An ``error`` response returned by the conductor."""
+
+
+class WebsocketClosed(Exception):
+    """Raised for in-flight requests when the connection closes."""
+
+
+def _pack(obj: Any) -> bytes:
+    return msgpack.packb(obj, use_bin_type=True)
+
+
+def _unpack(data: bytes) -> Any:
+    return msgpack.unpackb(data, raw=False)
+
+
+class WebsocketConnection:
+    """A single conductor WebSocket connection."""
+
+    def __init__(self, ws, origin: str = DEFAULT_ORIGIN):
+        self._ws = ws
+        self._origin = origin
+        self._ids = itertools.count(1)
+        self._pending: dict[int, asyncio.Future] = {}
+        self._signal_handlers: list[SignalHandler] = []
+        self._reader: Optional[asyncio.Task] = None
+
+    @classmethod
+    async def connect(
+        cls, url: str, origin: str = DEFAULT_ORIGIN
+    ) -> "WebsocketConnection":
+        ws = await ws_connect(url, additional_headers={"Origin": origin})
+        self = cls(ws, origin)
+        self._reader = asyncio.create_task(self._read_loop())
+        return self
+
+    def on_signal(self, handler: SignalHandler) -> None:
+        self._signal_handlers.append(handler)
+
+    async def authenticate(self, payload: Any) -> None:
+        """Send an ``authenticate`` frame (no response is returned)."""
+        frame = _pack({"type": "authenticate", "data": _pack(payload)})
+        await self._ws.send(frame)
+
+    async def request(self, payload: Any) -> Any:
+        """Send a ``request`` frame and await the decoded inner response."""
+        req_id = next(self._ids)
+        loop = asyncio.get_event_loop()
+        fut: asyncio.Future = loop.create_future()
+        self._pending[req_id] = fut
+        frame = _pack({"type": "request", "id": req_id, "data": _pack(payload)})
+        try:
+            await self._ws.send(frame)
+            return await fut
+        finally:
+            self._pending.pop(req_id, None)
+
+    async def _read_loop(self) -> None:
+        try:
+            async for raw in self._ws:
+                self._dispatch(raw)
+        except ConnectionClosed:
+            pass
+        finally:
+            closed = WebsocketClosed("connection closed")
+            for fut in self._pending.values():
+                if not fut.done():
+                    fut.set_exception(closed)
+            self._pending.clear()
+
+    def _dispatch(self, raw: bytes) -> None:
+        wire = _unpack(raw)
+        kind = wire.get("type")
+        if kind == "response":
+            fut = self._pending.get(wire["id"])
+            if fut is None or fut.done():
+                return
+            data = wire.get("data")
+            inner = _unpack(data) if data is not None else None
+            fut.set_result(inner)
+        elif kind == "signal":
+            data = wire.get("data")
+            if data is None:
+                return
+            for handler in self._signal_handlers:
+                handler(data)
+
+    async def close(self) -> None:
+        if self._reader is not None:
+            self._reader.cancel()
+        await self._ws.close()
diff --git a/holochain_client/admin/__init__.py b/holochain_client/admin/__init__.py
new file mode 100644
index 0000000..70a1e25
--- /dev/null
+++ b/holochain_client/admin/__init__.py
@@ -0,0 +1,3 @@
+from .client import AdminClient
+
+__all__ = ["AdminClient"]
diff --git a/holochain_client/admin/client.py b/holochain_client/admin/client.py
new file mode 100644
index 0000000..da56319
--- /dev/null
+++ b/holochain_client/admin/client.py
@@ -0,0 +1,286 @@
+"""The admin interface client."""
+
+from __future__ import annotations
+
+from typing import Any, List, Optional
+
+from .._api import ApiClient
+from .._transport import DEFAULT_ORIGIN, WebsocketConnection
+from ..hash import ActionHash, AgentPubKey, DnaHash
+from ..signing import (
+    SigningCredentials,
+    SigningKeyPair,
+    CredentialStore,
+    random_cap_secret,
+)
+from ..types.app import AppInfo, AppInterfaceInfo
+from ..types.capability import (
+    CapAccessAssigned,
+    GrantedFunctions,
+    GrantedFunctionsAll,
+    GrantZomeCallCapabilityPayload,
+    ZomeCallCapGrant,
+)
+from ..types.cell import CellId
+from ..types.common import AppAuthenticationToken, InstalledAppId
+from .types import (
+    AppAuthenticationTokenIssued,
+    AppBundleSource,
+    DeleteCloneCellPayload,
+    InstallAppPayload,
+)
+
+
+class AdminClient(ApiClient):
+    """Client for a conductor admin websocket interface."""
+
+    def __init__(self, connection: WebsocketConnection):
+        super().__init__(connection)
+        self.credentials = CredentialStore()
+
+    @classmethod
+    async def connect(cls, url: str, *, origin: str = DEFAULT_ORIGIN) -> "AdminClient":
+        connection = await WebsocketConnection.connect(url, origin=origin)
+        return cls(connection)
+
+    # -- DNA / cell introspection ------------------------------------------ #
+    async def list_dnas(self) -> List[DnaHash]:
+        return await self._send(
+            "list_dnas", response_type=List[DnaHash], expect="dnas_listed"
+        )
+
+    async def list_cell_ids(self) -> List[CellId]:
+        return await self._send(
+            "list_cell_ids", response_type=List[CellId], expect="cell_ids_listed"
+        )
+
+    async def get_dna_definition(self, cell_id: CellId) -> Any:
+        # ``DnaDef`` is returned as a decoded structure (pass-through).
+        return await self._send(
+            "get_dna_definition", cell_id, expect="dna_definition_returned"
+        )
+
+    async def generate_agent_pub_key(self) -> AgentPubKey:
+        return await self._send(
+            "generate_agent_pub_key",
+            response_type=AgentPubKey,
+            expect="agent_pub_key_generated",
+        )
+
+    # -- App lifecycle ------------------------------------------------------ #
+    async def install_app(
+        self,
+        source: AppBundleSource,
+        *,
+        agent_key: Optional[AgentPubKey] = None,
+        installed_app_id: Optional[InstalledAppId] = None,
+        network_seed: Optional[str] = None,
+        roles_settings: Optional[Any] = None,
+        ignore_genesis_failure: bool = False,
+    ) -> AppInfo:
+        payload = InstallAppPayload(
+            source=source,
+            agent_key=agent_key,
+            installed_app_id=installed_app_id,
+            network_seed=network_seed,
+            roles_settings=roles_settings,
+            ignore_genesis_failure=ignore_genesis_failure,
+        )
+        return await self._send(
+            "install_app", payload, response_type=AppInfo, expect="app_installed"
+        )
+
+    async def uninstall_app(
+        self, installed_app_id: InstalledAppId, *, force: bool = False
+    ) -> None:
+        await self._send(
+            "uninstall_app",
+            {"installed_app_id": installed_app_id, "force": force},
+            expect="app_uninstalled",
+        )
+
+    async def enable_app(self, installed_app_id: InstalledAppId) -> AppInfo:
+        return await self._send(
+            "enable_app",
+            {"installed_app_id": installed_app_id},
+            response_type=AppInfo,
+            expect="app_enabled",
+        )
+
+    async def disable_app(self, installed_app_id: InstalledAppId) -> None:
+        await self._send(
+            "disable_app",
+            {"installed_app_id": installed_app_id},
+            expect="app_disabled",
+        )
+
+    async def list_apps(self, *, status_filter: Optional[str] = None) -> List[AppInfo]:
+        return await self._send(
+            "list_apps",
+            {"status_filter": status_filter},
+            response_type=List[AppInfo],
+            expect="apps_listed",
+        )
+
+    async def delete_clone_cell(self, payload: DeleteCloneCellPayload) -> None:
+        await self._send("delete_clone_cell", payload, expect="clone_cell_deleted")
+
+    # -- App interfaces & auth tokens -------------------------------------- #
+    async def attach_app_interface(
+        self,
+        *,
+        port: Optional[int] = None,
+        allowed_origins: str = "*",
+        installed_app_id: Optional[InstalledAppId] = None,
+    ) -> int:
+        result = await self._send(
+            "attach_app_interface",
+            {
+                "port": port,
+                "danger_bind_addr": None,
+                "allowed_origins": allowed_origins,
+                "installed_app_id": installed_app_id,
+            },
+            expect="app_interface_attached",
+        )
+        return result["port"]
+
+    async def list_app_interfaces(self) -> List[AppInterfaceInfo]:
+        return await self._send(
+            "list_app_interfaces",
+            response_type=List[AppInterfaceInfo],
+            expect="app_interfaces_listed",
+        )
+
+    async def issue_app_authentication_token(
+        self,
+        installed_app_id: InstalledAppId,
+        *,
+        expiry_seconds: int = 30,
+        single_use: bool = True,
+    ) -> AppAuthenticationTokenIssued:
+        return await self._send(
+            "issue_app_authentication_token",
+            {
+                "installed_app_id": installed_app_id,
+                "expiry_seconds": expiry_seconds,
+                "single_use": single_use,
+            },
+            response_type=AppAuthenticationTokenIssued,
+            expect="app_authentication_token_issued",
+        )
+
+    async def revoke_app_authentication_token(
+        self, token: AppAuthenticationToken
+    ) -> None:
+        await self._send(
+            "revoke_app_authentication_token",
+            token,
+            expect="app_authentication_token_revoked",
+        )
+
+    # -- Agent info -------------------------------------------------------- #
+    async def add_agent_info(self, agent_infos: List[str]) -> None:
+        await self._send(
+            "add_agent_info", {"agent_infos": agent_infos}, expect="agent_info_added"
+        )
+
+    async def agent_info(
+        self, *, dna_hashes: Optional[List[DnaHash]] = None
+    ) -> List[str]:
+        return await self._send(
+            "agent_info",
+            {"dna_hashes": dna_hashes},
+            response_type=List[str],
+            expect="agent_info",
+        )
+
+    # -- Capabilities ------------------------------------------------------ #
+    async def grant_zome_call_capability(
+        self, payload: GrantZomeCallCapabilityPayload
+    ) -> ActionHash:
+        return await self._send(
+            "grant_zome_call_capability",
+            payload,
+            response_type=ActionHash,
+            expect="zome_call_capability_granted",
+        )
+
+    async def revoke_zome_call_capability(
+        self, action_hash: ActionHash, cell_id: CellId
+    ) -> None:
+        await self._send(
+            "revoke_zome_call_capability",
+            {"action_hash": action_hash, "cell_id": cell_id},
+            expect="zome_call_capability_revoked",
+        )
+
+    async def list_capability_grants(
+        self, installed_app_id: InstalledAppId, *, include_revoked: bool = False
+    ) -> Any:
+        return await self._send(
+            "list_capability_grants",
+            {"installed_app_id": installed_app_id, "include_revoked": include_revoked},
+            expect="capability_grants_info",
+        )
+
+    async def authorize_signing_credentials(
+        self,
+        cell_id: CellId,
+        *,
+        functions: Optional[GrantedFunctions] = None,
+    ) -> SigningCredentials:
+        """Generate a signing keypair, grant it a zome-call capability on
+        ``cell_id``, store the resulting credentials, and return them."""
+        keypair = SigningKeyPair()
+        cap_secret = random_cap_secret()
+        grant = GrantZomeCallCapabilityPayload(
+            cell_id=cell_id,
+            cap_grant=ZomeCallCapGrant(
+                tag="zome-call-signing-key",
+                access=CapAccessAssigned(
+                    secret=cap_secret, assignees=[keypair.agent_pub_key]
+                ),
+                functions=functions or GrantedFunctionsAll(),
+            ),
+        )
+        await self.grant_zome_call_capability(grant)
+        credentials = SigningCredentials(cap_secret=cap_secret, signing_key=keypair)
+        self.credentials.set(cell_id, credentials)
+        return credentials
+
+    # -- Introspection dumps (pass-through) -------------------------------- #
+    async def dump_state(self, cell_id: CellId) -> str:
+        return await self._send(
+            "dump_state", {"cell_id": cell_id}, expect="state_dumped"
+        )
+
+    async def dump_conductor_state(self) -> str:
+        return await self._send("dump_conductor_state", expect="conductor_state_dumped")
+
+    async def dump_full_state(
+        self, cell_id: CellId, *, dht_ops_cursor: Optional[int] = None
+    ) -> Any:
+        return await self._send(
+            "dump_full_state",
+            {"cell_id": cell_id, "dht_ops_cursor": dht_ops_cursor},
+            expect="full_state_dumped",
+        )
+
+    async def dump_network_metrics(
+        self,
+        *,
+        dna_hash: Optional[DnaHash] = None,
+        include_dht_summary: bool = False,
+    ) -> Any:
+        return await self._send(
+            "dump_network_metrics",
+            {"dna_hash": dna_hash, "include_dht_summary": include_dht_summary},
+            expect="network_metrics_dumped",
+        )
+
+    async def dump_network_stats(self) -> Any:
+        return await self._send("dump_network_stats", expect="network_stats_dumped")
+
+    async def storage_info(self) -> Any:
+        return await self._send("storage_info", expect="storage_info")
diff --git a/holochain_client/admin/types.py b/holochain_client/admin/types.py
new file mode 100644
index 0000000..f6d531b
--- /dev/null
+++ b/holochain_client/admin/types.py
@@ -0,0 +1,96 @@
+"""Request/response payload types specific to the admin interface."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Optional
+
+from ..hash import AgentPubKey, DnaHash
+from ..serde import TaggedUnion, variant
+from ..types.cell import CloneId
+from ..types.common import (
+    AppAuthenticationToken,
+    InstalledAppId,
+    NetworkSeed,
+    Timestamp,
+)
+
+
+class AppBundleSource(TaggedUnion):
+    """Where to find an app bundle when installing."""
+
+
+@variant(AppBundleSource, "bytes")
+@dataclass
+class AppBundleBytes:
+    """Raw ``.happ`` bundle bytes."""
+
+    bundle: bytes = field(metadata={"newtype": True})
+
+
+@variant(AppBundleSource, "path")
+@dataclass
+class AppBundlePath:
+    """A filesystem path to a ``.happ`` bundle, read by the conductor."""
+
+    path: str = field(metadata={"newtype": True})
+
+
+@dataclass
+class DnaModifiersOpt:
+    """Optional DNA modifier overrides."""
+
+    network_seed: Optional[NetworkSeed] = None
+    properties: Optional[Any] = None
+
+
+@dataclass
+class InstallAppPayload:
+    source: AppBundleSource
+    agent_key: Optional[AgentPubKey] = None
+    installed_app_id: Optional[InstalledAppId] = None
+    network_seed: Optional[NetworkSeed] = None
+    roles_settings: Optional[Any] = None
+    ignore_genesis_failure: bool = False
+
+    def __to_wire__(self) -> dict:
+        # ``source`` is a tagged union; everything else is plain. Optional fields
+        # are sent as nil, which the conductor's serde accepts.
+        from ..serde import encode
+
+        return {
+            "source": encode(self.source),
+            "agent_key": encode(self.agent_key),
+            "installed_app_id": self.installed_app_id,
+            "network_seed": self.network_seed,
+            "roles_settings": encode(self.roles_settings),
+            "ignore_genesis_failure": self.ignore_genesis_failure,
+        }
+
+
+class CloneCellId(TaggedUnion):
+    """Identifies a clone cell, by clone id or by DNA hash."""
+
+
+@variant(CloneCellId, "clone_id")
+@dataclass
+class CloneCellByCloneId:
+    clone_id: CloneId = field(metadata={"newtype": True})
+
+
+@variant(CloneCellId, "dna_hash")
+@dataclass
+class CloneCellByDnaHash:
+    dna_hash: DnaHash = field(metadata={"newtype": True})
+
+
+@dataclass
+class DeleteCloneCellPayload:
+    app_id: InstalledAppId
+    clone_cell_id: CloneCellId
+
+
+@dataclass
+class AppAuthenticationTokenIssued:
+    token: AppAuthenticationToken
+    expires_at: Optional[Timestamp] = None
diff --git a/holochain_client/api/admin/client.py b/holochain_client/api/admin/client.py
deleted file mode 100644
index 215c58e..0000000
--- a/holochain_client/api/admin/client.py
+++ /dev/null
@@ -1,166 +0,0 @@
-from typing import Any, List
-import asyncio
-import websockets
-from holochain_client.api.admin.types import (
-    AddAdminInterface,
-    AppEnabled,
-    AppInfo,
-    AppInterfaceAttached,
-    AttachAppInterface,
-    DisableApp,
-    DumpNetworkStats,
-    EnableApp,
-    GenerateAgentPubKey,
-    GrantZomeCallCapability,
-    InstallApp,
-    ListAppInterfaces,
-    ListApps,
-    ListCellIds,
-    ListDnas,
-    RegisterDnaPayload,
-    UninstallApp,
-)
-import json
-from holochain_client.api.common.pending_request_pool import PendingRequestPool
-from holochain_client.api.common.request import (
-    create_wire_message_request,
-    tag_from_type,
-)
-from holochain_client.api.common.types import AgentPubKey, CellId, DnaHash
-import inspect
-
-
-class AdminClient:
-    url: str
-    defaultTimeout: int
-
-    client: websockets.WebSocketClientProtocol
-    requestId: int = 0
-    pendingRequestPool: PendingRequestPool
-
-    def __init__(self, url: str, defaultTimeout: int = 60):
-        self.url = url
-        self.defaultTimeout = defaultTimeout
-
-    @classmethod
-    async def create(cls, url: str, defaultTimeout: int = 60):
-        """The recommended way to create an AdminClient"""
-        self = cls(url, defaultTimeout)
-        await self.connect()
-        return self
-
-    def connect_sync(self, event_loop):
-        return event_loop.run_until_complete(self.connect())
-
-    async def connect(self):
-        self.client = await websockets.connect(self.url)
-        self.pendingRequestPool = PendingRequestPool(self.client)
-
-    async def add_admin_interfaces(self, request: List[AddAdminInterface]):
-        response = await self._exchange(
-            request, tag=inspect.currentframe().f_code.co_name
-        )
-        assert response["type"] == "admin_interfaces_added", f"response was: {response}"
-
-    async def register_dna(self, request: RegisterDnaPayload) -> DnaHash:
-        response = await self._exchange(
-            request, tag=inspect.currentframe().f_code.co_name
-        )
-        assert response["type"] == "dna_registered", f"response was: {response}"
-        return response["data"]
-
-    async def get_dna_definition(self, dna_hash: DnaHash) -> object:
-        response = await self._exchange(
-            dna_hash, tag=inspect.currentframe().f_code.co_name
-        )
-        assert (
-            response["type"] == "dna_definition_returned"
-        ), f"response was: {response}"
-        return response["data"]
-
-    async def install_app(self, request: InstallApp) -> AppInfo:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "app_installed", f"response was: {response}"
-        return AppInfo(**response["data"])
-
-    async def uninstall_app(self, request: UninstallApp):
-        response = await self._exchange(
-            request, tag=inspect.currentframe().f_code.co_name
-        )
-        assert response["type"] == "app_uninstalled", f"response was: {response}"
-
-    async def list_dnas(self, request: ListDnas = ListDnas()) -> List[DnaHash]:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "dnas_listed", f"response was: {response}"
-        return response["data"]
-
-    async def generate_agent_pub_key(
-        self, request: GenerateAgentPubKey = GenerateAgentPubKey()
-    ) -> AgentPubKey:
-        response = await self._exchange(request, tag_from_type(request))
-        assert (
-            response["type"] == "agent_pub_key_generated"
-        ), f"response was: {response}"
-        return response["data"]
-
-    async def list_cell_ids(self, request: ListCellIds = ListCellIds()) -> List[CellId]:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "cell_ids_listed", f"response was: {response}"
-        print(response["data"])
-        return response["data"]
-
-    async def list_apps(self, request: ListApps = ListApps()) -> List[AppInfo]:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "apps_listed", f"response was: {response}"
-        return [AppInfo(**x) for x in response["data"]]
-
-    async def enable_app(self, request: EnableApp) -> AppEnabled:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "app_enabled", f"response was: {response}"
-        return AppEnabled(*response["data"])
-
-    async def disable_app(self, request: DisableApp):
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "app_disabled", f"response was: {response}"
-
-    async def attach_app_interface(
-        self, request: AttachAppInterface = AttachAppInterface()
-    ) -> AppInterfaceAttached:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "app_interface_attached", f"response was: {response}"
-        return AppInterfaceAttached(port=int(response["data"]["port"]))
-
-    async def list_app_interfaces(
-        self, request: ListAppInterfaces = ListAppInterfaces()
-    ) -> List[int]:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "app_interfaces_listed", f"response was: {response}"
-        return response["data"]
-
-    async def dump_network_stats(
-        self, request: DumpNetworkStats = DumpNetworkStats()
-    ) -> object:
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "network_stats_dumped", f"response was: {response}"
-        return json.loads(response["data"])
-
-    async def grant_zome_call_capability(self, request: GrantZomeCallCapability):
-        response = await self._exchange(request, tag_from_type(request))
-        assert (
-            response["type"] == "zome_call_capability_granted"
-        ), f"response was: {response}"
-
-    async def close(self):
-        await self.client.close()
-
-    async def _exchange(self, request: Any, tag: str) -> Any:
-        requestId = self.requestId
-        self.requestId += 1
-        req = create_wire_message_request(request, tag, requestId)
-        await self.client.send(req)
-
-        completed = asyncio.Event()
-        self.pendingRequestPool.add(requestId, completed)
-        await asyncio.wait_for(completed.wait(), self.defaultTimeout)
-
-        return self.pendingRequestPool.take_response(requestId)
diff --git a/holochain_client/api/admin/types.py b/holochain_client/api/admin/types.py
deleted file mode 100644
index 4712f63..0000000
--- a/holochain_client/api/admin/types.py
+++ /dev/null
@@ -1,282 +0,0 @@
-from dataclasses import dataclass, field
-from enum import Enum
-from typing import Any, Dict, List, Optional, Tuple, Union
-from holochain_client.api.common.types import (
-    AgentPubKey,
-    CellId,
-    DnaHash,
-    MembraneProof,
-    NetworkSeed,
-    RoleName,
-)
-
-
-@dataclass
-class WireMessageRequest:
-    id: int
-    data: List[int]
-    type: str = "request"
-
-
-@dataclass
-class AdminRequest:
-    type: str
-    data: Dict
-
-
-@dataclass
-class CellProvisioningCreate:
-    deferred: bool
-    strategy: str = "Create"
-
-
-@dataclass
-class CellProvisioningCloneOnly:
-    strategy: str = "CloneOnly"
-
-
-@dataclass
-class Duration:
-    secs: int
-    nanos: int
-
-
-@dataclass
-class DnaModifiers:
-    network_seed: Optional[NetworkSeed] = None
-    properties: Optional[Dict] = None
-    origin_time: Optional[int] = None
-    quantum_time: Optional[Duration] = None
-
-
-@dataclass
-class AppRoleDnaManifest:
-    bundled: str
-    modifiers: Dict
-    installed_hash: Optional[str] = None
-    clone_limit: int = 0
-
-
-@dataclass
-class AppRoleManifest:
-    name: RoleName
-    dna: AppRoleDnaManifest
-    provisioning: Optional[
-        Union[CellProvisioningCreate, CellProvisioningCloneOnly]
-    ] = None
-
-
-@dataclass
-class AppManifest:
-    manifest_version: str
-    name: str
-    description: Optional[str]
-    roles: List[AppRoleManifest]
-
-
-@dataclass
-class AppBundleSourceBundle:
-    manifest: AppManifest
-    resources: Dict[str, bytes]
-
-
-@dataclass
-class InstallApp:
-    agent_key: AgentPubKey
-
-    # Exactly one of these must be set
-    bundle: Optional[AppBundleSourceBundle] = None
-    path: Optional[str] = None
-
-    installed_app_id: Optional[str] = None
-    membrane_proofs: Dict[RoleName, MembraneProof] = field(default_factory=dict)
-    network_seed: Optional[NetworkSeed] = None
-
-
-@dataclass
-class GenerateAgentPubKey:
-    pass
-
-
-AppStatusFilter = Enum(
-    "AppStatusFilter", ["Enabled", "Disabled", "Running", "Stopped", "Paused"]
-)
-
-
-@dataclass
-class ListApps:
-    status_filter: Optional[AppStatusFilter] = None
-
-
-@dataclass
-class DumpNetworkStats:
-    pass
-
-
-@dataclass
-class CellInfoProvisioned:
-    cell_id: CellId
-    dna_modifiers: DnaModifiers
-    name: str
-
-
-@dataclass
-class CellInfoCloned:
-    cell_id: CellId
-    clone_id: str
-    original_dna_hash: DnaHash
-    dna_modifiers: DnaModifiers
-    name: str
-    enabled: bool
-
-
-@dataclass
-class CellInfoStem:
-    original_dna_hash: DnaHash
-    dna_modifiers: DnaModifiers
-    name: Optional[str]
-
-
-@dataclass
-class AppinfoStatusPaused:
-    reason: Any  # TODO
-    type: str = "Paused"
-
-
-@dataclass
-class AppInfoStatusDisabled:
-    reason: Any  # TODO
-    type: str = "Disabled"
-
-
-@dataclass
-class AppinfoStatusRunning:
-    type: str = "Running"
-
-
-CellInfoKind = Enum("CellInfoKind", ["provisioned", "cloned", "stem"])
-
-
-@dataclass
-class AppInfo:
-    installed_app_id: str
-    cell_info: Dict[
-        RoleName,
-        List[
-            Dict[CellInfoKind, Union[CellInfoProvisioned, CellInfoCloned, CellInfoStem]]
-        ],
-    ]
-    status: Union[AppinfoStatusPaused, AppInfoStatusDisabled, AppinfoStatusRunning]
-    agent_pub_key: AgentPubKey
-    manifest: AppManifest
-
-
-@dataclass
-class CapAccessUnrestricted:
-    type: str = "Unrestricted"
-
-
-@dataclass
-class CapAccessTransferable:
-    secret: bytes
-    type: str = "Transferable"
-
-
-@dataclass
-class CapAccessAssigned:
-    secret: bytes
-    assignees: List[AgentPubKey]
-
-
-GrantedFunctionKind = Enum("GrantedFunctionKind", ["All", "Listed"])
-GrantedFunctions = Dict[GrantedFunctionKind, Union[None, List[str]]]
-
-CapAccessKind = Enum("CapAccessKind", ["Unrestricted", "Transferable", "Assigned"])
-
-
-@dataclass
-class ZomeCallCapGrant:
-    tag: str
-    access: Dict[
-        CapAccessAssigned,
-        Union[CapAccessUnrestricted, CapAccessTransferable, CapAccessAssigned],
-    ]
-    functions: GrantedFunctions
-
-
-@dataclass
-class GrantZomeCallCapability:
-    cell_id: CellId
-    cap_grant: ZomeCallCapGrant
-
-
-@dataclass
-class EnableApp:
-    installed_app_id: str
-
-
-@dataclass
-class AppEnabled:
-    app: AppInfo
-    errors: List[Tuple[CellId, str]]
-
-
-@dataclass
-class AttachAppInterface:
-    port: Optional[int] = None
-
-
-@dataclass
-class AppInterfaceAttached:
-    port: int
-
-
-@dataclass
-class ListAppInterfaces:
-    pass
-
-
-@dataclass
-class InterfaceDriverWebsocket:
-    port: int
-    type: str = "websocket"
-
-
-@dataclass
-class AddAdminInterface:
-    driver: Union[InterfaceDriverWebsocket]
-
-
-@dataclass
-class RegisterDnaPayloadPath:
-    path: str
-    modifiers: Optional[DnaModifiers] = None
-
-
-@dataclass
-class RegisterDnaPayloadHash:
-    hash: DnaHash
-    modifiers: DnaModifiers
-
-
-RegisterDnaPayload = Union[RegisterDnaPayloadPath, RegisterDnaPayloadHash]
-
-
-@dataclass
-class UninstallApp:
-    installed_app_id: str
-
-
-@dataclass
-class ListDnas:
-    pass
-
-
-@dataclass
-class ListCellIds:
-    pass
-
-
-@dataclass
-class DisableApp:
-    installed_app_id: str
diff --git a/holochain_client/api/app/client.py b/holochain_client/api/app/client.py
deleted file mode 100644
index e56fe8e..0000000
--- a/holochain_client/api/app/client.py
+++ /dev/null
@@ -1,101 +0,0 @@
-from typing import Any
-import asyncio
-import websockets
-from holochain_client.api.app.types import CallZome, ZomeCallUnsigned
-from holochain_client.api.common.pending_request_pool import PendingRequestPool
-from holochain_client.api.common.request import (
-    create_wire_message_request,
-    tag_from_type,
-)
-from holochain_client.api.common.signing import get_from_creds_store
-import os
-from datetime import datetime
-from holochain_serialization import ZomeCallUnsignedPy, get_data_to_sign
-
-
-class AppClient:
-    url: str
-    defaultTimeout: int
-
-    client: websockets.WebSocketClientProtocol
-    requestId: int = 0
-    pendingRequestPool: PendingRequestPool
-
-    def __init__(self, url: str, defaultTimeout: int = 60) -> None:
-        self.url = url
-        self.defaultTimeout = defaultTimeout
-
-    @classmethod
-    async def create(cls, url: str, defaultTimeout: int = 60):
-        """The recommended way to create an AppClient"""
-        self = cls(url, defaultTimeout)
-        await self.connect()
-        return self
-
-    def connect_sync(self, event_loop):
-        event_loop.run_until_complete(self.connect())
-
-    async def connect(self):
-        self.client = await websockets.connect(self.url)
-        self.pendingRequestPool = PendingRequestPool(self.client)
-        return self
-
-    async def call_zome(self, request: ZomeCallUnsigned) -> bytes:
-        """
-        :return: The literal response from the zome call
-        """
-        signing_credentials = get_from_creds_store(request.cell_id)
-        if signing_credentials is None:
-            raise Exception(
-                f"No signing credentials have been authorized for cell_id: {request.cell_id}"
-            )
-
-        provenance = signing_credentials.signing_key.identity  # Request is actually made on behalf of the siging credentials, not the current agent!
-        nonce = os.urandom(32)
-        expires_at = int((datetime.now().timestamp() + 5 * 60) * 1e6)
-        cap_secret = signing_credentials.cap_secret
-
-        zome_call_py = ZomeCallUnsignedPy(
-            provenance,
-            request.cell_id[0],
-            request.cell_id[1],
-            request.zome_name,
-            request.fn_name,
-            request.payload,
-            nonce,
-            expires_at,
-            cap_secret=cap_secret,
-        )
-        data_to_sign = bytes(get_data_to_sign(zome_call_py))
-        signature = signing_credentials.signing_key.sign(data_to_sign)
-
-        request = CallZome(
-            cell_id=request.cell_id,
-            zome_name=request.zome_name,
-            fn_name=request.fn_name,
-            payload=request.payload,
-            provenance=provenance,
-            signature=signature,
-            nonce=nonce,
-            expires_at=expires_at,
-            cap_secret=cap_secret,
-        )
-
-        response = await self._exchange(request, tag_from_type(request))
-        assert response["type"] == "zome_called", f"response was: {response}"
-        return response["data"]
-
-    async def close(self):
-        await self.client.close()
-
-    async def _exchange(self, request: Any, tag: str) -> Any:
-        requestId = self.requestId
-        self.requestId += 1
-        req = create_wire_message_request(request, tag, requestId)
-        await self.client.send(req)
-
-        completed = asyncio.Event()
-        self.pendingRequestPool.add(requestId, completed)
-        await asyncio.wait_for(completed.wait(), self.defaultTimeout)
-
-        return self.pendingRequestPool.take_response(requestId)
diff --git a/holochain_client/api/app/types.py b/holochain_client/api/app/types.py
deleted file mode 100644
index b53fac9..0000000
--- a/holochain_client/api/app/types.py
+++ /dev/null
@@ -1,31 +0,0 @@
-import dataclasses
-from typing import Any
-
-from holochain_client.api.common.types import (
-    AgentPubKey,
-    CellId,
-    FunctionName,
-    ZomeName,
-)
-
-
-@dataclasses.dataclass
-class ZomeCallUnsigned:
-    cell_id: CellId
-    zome_name: ZomeName
-    fn_name: FunctionName
-    payload: Any
-
-
-@dataclasses.dataclass
-class CallZome:
-    cell_id: CellId
-    zome_name: ZomeName
-    fn_name: FunctionName
-    payload: bytes
-    provenance: AgentPubKey
-    signature: bytes
-    nonce: bytes
-    """Microseconds from unix epoch"""
-    expires_at: int
-    cap_secret: bytes
diff --git a/holochain_client/api/common/__init__.py b/holochain_client/api/common/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/holochain_client/api/common/pending_request_pool.py b/holochain_client/api/common/pending_request_pool.py
deleted file mode 100644
index b6d45e4..0000000
--- a/holochain_client/api/common/pending_request_pool.py
+++ /dev/null
@@ -1,39 +0,0 @@
-from typing import Any, Dict
-import asyncio
-import websockets
-import msgpack
-import dataclasses
-
-
-@dataclasses.dataclass
-class PendingRequest:
-    id: int
-    trigger: asyncio.Event
-
-
-class PendingRequestPool:
-    _requests: Dict[int, PendingRequest] = {}
-    _responses: Dict[int, Any] = {}
-
-    def __init__(self, client: websockets.WebSocketClientProtocol):
-        asyncio.create_task(self._handle_responses(client))
-
-    def add(self, id: int, trigger: asyncio.Event):
-        self._requests[id] = PendingRequest(id, trigger)
-
-    async def _handle_responses(self, client: websockets.WebSocketClientProtocol):
-        async for message in client:
-            data = msgpack.unpackb(message)
-            if "id" in data and "type" in data and data["type"] == "response":
-                id = data["id"]
-                if id in self._requests:
-                    data["data"] = msgpack.unpackb(data["data"])
-                    self._responses[id] = data
-                    self._requests[id].trigger.set()
-                    del self._requests[id]
-                else:
-                    # TODO logging
-                    print(f"Received response for unknown request id: {id}")
-
-    def take_response(self, id: int) -> Any:
-        return self._responses.pop(id)["data"]
diff --git a/holochain_client/api/common/request.py b/holochain_client/api/common/request.py
deleted file mode 100644
index 1b0764a..0000000
--- a/holochain_client/api/common/request.py
+++ /dev/null
@@ -1,38 +0,0 @@
-from typing import Any
-from holochain_client.api.admin.types import (
-    AdminRequest,
-    WireMessageRequest,
-)
-import msgpack
-import dataclasses
-import re
-
-
-def tag_from_type(req: Any) -> str:
-    # TODO compile
-    return re.sub(r"(?<!^)(?=[A-Z])", "_", req.__class__.__name__).lower()
-
-
-def _create_request(req: Any, tag: str) -> bytes:
-    if isinstance(req, list):
-        data = [dataclasses.asdict(x) for x in req]
-    elif isinstance(req, bytes):
-        data = req
-    else:
-        data = dataclasses.asdict(req)
-
-    if len(data) == 0:
-        # If there is no data, we should send None instead of an empty dict
-        data = None
-    elif isinstance(data, dict):
-        # Remove any None values from the data, no need to send fields without values
-        data = {k: v for k, v in data.items() if v is not None}
-    req = AdminRequest(tag, data)
-    # print("Sending request: ", req)  # TODO logging
-    return msgpack.packb(dataclasses.asdict(req))
-
-
-def create_wire_message_request(req: Any, tag: str, requestId: int) -> bytes:
-    data = _create_request(req, tag)
-    msg = WireMessageRequest(id=requestId, data=[x for x in data])
-    return msgpack.packb(dataclasses.asdict(msg))
diff --git a/holochain_client/api/common/signing.py b/holochain_client/api/common/signing.py
deleted file mode 100644
index be30ed6..0000000
--- a/holochain_client/api/common/signing.py
+++ /dev/null
@@ -1,90 +0,0 @@
-import dataclasses
-from typing import Dict, Optional
-from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
-from holochain_client.api.admin.client import AdminClient
-from holochain_client.api.admin.types import (
-    CapAccessAssigned,
-    GrantZomeCallCapability,
-    GrantedFunctions,
-    ZomeCallCapGrant,
-)
-from holochain_client.api.common.types import AgentPubKey, CellId
-import os
-import base64
-
-
-class SigningKeyWithIdentity:
-    _signing_key: Ed25519PrivateKey
-
-    """This will be recognised by Holochain as an agent public key but just contains the generated signing key associated with the signing keypair above."""
-    identity: AgentPubKey
-
-    def __init__(self, signing_key: Ed25519PrivateKey):
-        self._signing_key = signing_key
-
-        # The first 3 bytes are the constant AGENT_PREFIX from holochain/holochain and the last 4 bytes are the location bytes which
-        # are deliberately set to [0, 0, 0, 0] since this agent identity is only used for signing and so its location is not relevant.
-        self.identity = bytes(
-            [
-                132,
-                32,
-                36,
-                *signing_key.public_key().public_bytes_raw(),
-                0,
-                0,
-                0,
-                0,
-            ]
-        )
-        assert len(self.identity) == 39
-
-    def sign(self, data: bytes) -> bytes:
-        return self._signing_key.sign(data)
-
-
-@dataclasses.dataclass
-class SigningCredentials:
-    cap_secret: bytes
-    signing_key: SigningKeyWithIdentity
-
-
-def generate_signing_keypair() -> SigningKeyWithIdentity:
-    signing_key = Ed25519PrivateKey.generate()
-
-    return SigningKeyWithIdentity(signing_key)
-
-
-CREDS_STORE: Dict[str, SigningCredentials] = {}
-
-
-def _add_to_creds_store(cell_id: CellId, creds: SigningCredentials):
-    CREDS_STORE[base64.b64encode(bytes([*cell_id[0], *cell_id[1]]))] = creds
-
-
-def get_from_creds_store(cell_id: CellId) -> Optional[SigningCredentials]:
-    return CREDS_STORE.get(base64.b64encode(bytes([*cell_id[0], *cell_id[1]])))
-
-
-async def authorize_signing_credentials(
-    admin_client: AdminClient,
-    cell_id: CellId,
-    functions: Optional[GrantedFunctions] = None,
-):
-    signing_keypair = generate_signing_keypair()
-    cap_secret = os.urandom(64)
-    await admin_client.grant_zome_call_capability(
-        GrantZomeCallCapability(
-            cell_id=cell_id,
-            cap_grant=ZomeCallCapGrant(
-                tag="zome-call-signing-key",
-                functions=functions if functions else {"All": None},
-                access={
-                    "Assigned": CapAccessAssigned(
-                        secret=cap_secret, assignees=[signing_keypair.identity]
-                    )
-                },
-            ),
-        )
-    )
-
-    _add_to_creds_store(cell_id, SigningCredentials(cap_secret, signing_keypair))
diff --git a/holochain_client/api/common/types.py b/holochain_client/api/common/types.py
deleted file mode 100644
index 84afd9e..0000000
--- a/holochain_client/api/common/types.py
+++ /dev/null
@@ -1,8 +0,0 @@
-DnaHash = bytes
-AgentPubKey = bytes
-CellId = [DnaHash, AgentPubKey]
-ZomeName = str
-FunctionName = str
-RoleName = str
-MembraneProof = bytes
-NetworkSeed = str
diff --git a/holochain_client/app/__init__.py b/holochain_client/app/__init__.py
new file mode 100644
index 0000000..79ae909
--- /dev/null
+++ b/holochain_client/app/__init__.py
@@ -0,0 +1,4 @@
+from .client import AppClient
+from .types import AppSignal
+
+__all__ = ["AppClient", "AppSignal"]
diff --git a/holochain_client/app/client.py b/holochain_client/app/client.py
new file mode 100644
index 0000000..549b6db
--- /dev/null
+++ b/holochain_client/app/client.py
@@ -0,0 +1,128 @@
+"""The app interface client."""
+
+from __future__ import annotations
+
+from typing import Any, Callable, List, Optional, Union
+
+import msgpack
+
+from .._api import ApiClient
+from .._transport import ConductorError, DEFAULT_ORIGIN, WebsocketConnection
+from ..signing import CredentialStore, SigningCredentials, sign_zome_call
+from ..types.app import AppInfo
+from ..types.cell import CellId
+from ..types.common import AppAuthenticationToken, FunctionName, ZomeName
+from .types import AppSignal, SystemSignal
+
+SignalCallback = Callable[[Union[AppSignal, SystemSignal]], Any]
+
+
+class AppClient(ApiClient):
+    """Client for a conductor app websocket interface.
+
+    An app websocket must be authenticated with a token issued by the admin
+    interface (:meth:`AdminClient.issue_app_authentication_token`) before any
+    request will be answered.
+    """
+
+    def __init__(self, connection: WebsocketConnection):
+        super().__init__(connection)
+        self.credentials = CredentialStore()
+        self._signal_callbacks: List[SignalCallback] = []
+        connection.on_signal(self._handle_signal)
+
+    @classmethod
+    async def connect(
+        cls,
+        url: str,
+        token: AppAuthenticationToken,
+        *,
+        origin: str = DEFAULT_ORIGIN,
+    ) -> "AppClient":
+        connection = await WebsocketConnection.connect(url, origin=origin)
+        client = cls(connection)
+        await connection.authenticate({"token": token})
+        return client
+
+    # -- Signals ----------------------------------------------------------- #
+    def on_signal(self, callback: SignalCallback) -> None:
+        self._signal_callbacks.append(callback)
+
+    def _handle_signal(self, data: bytes) -> None:
+        signal = msgpack.unpackb(data, raw=False)
+        kind = signal.get("type")
+        value = signal.get("value")
+        if kind == "app":
+            decoded = AppSignal(
+                cell_id=CellId.__from_wire__(value["cell_id"]),
+                zome_name=value["zome_name"],
+                payload=msgpack.unpackb(value["signal"], raw=False),
+            )
+        elif kind == "system":
+            decoded = SystemSignal(value=value)
+        else:
+            return
+        for callback in self._signal_callbacks:
+            callback(decoded)
+
+    # -- App info ---------------------------------------------------------- #
+    async def app_info(self) -> Optional[AppInfo]:
+        return await self._send(
+            "app_info", response_type=Optional[AppInfo], expect="app_info"
+        )
+
+    # -- Zome calls -------------------------------------------------------- #
+    async def call_zome(
+        self,
+        cell_id: CellId,
+        zome_name: ZomeName,
+        fn_name: FunctionName,
+        payload: Any = None,
+        *,
+        credentials: Optional[SigningCredentials] = None,
+    ) -> Any:
+        """Sign and make a zome call, returning the MessagePack-decoded result."""
+        credentials = credentials or self.credentials.get(cell_id)
+        if credentials is None:
+            raise ConductorError(
+                f"no signing credentials authorized for cell {cell_id!r}"
+            )
+        signed = sign_zome_call(
+            cell_id=cell_id,
+            zome_name=zome_name,
+            fn_name=fn_name,
+            payload=payload,
+            provenance=credentials.signing_key.agent_pub_key,
+            signing_key=credentials.signing_key,
+            cap_secret=credentials.cap_secret,
+        )
+        result = await self._send(
+            "call_zome",
+            {"bytes": signed.bytes, "signature": signed.signature},
+            expect="zome_called",
+        )
+        # The result is the zome's return value as MessagePack bytes.
+        return msgpack.unpackb(result, raw=False)
+
+    # -- Network introspection (pass-through) ------------------------------ #
+    async def dump_network_metrics(
+        self,
+        *,
+        dna_hash: Optional[Any] = None,
+        include_dht_summary: bool = False,
+    ) -> Any:
+        return await self._send(
+            "dump_network_metrics",
+            {"dna_hash": dna_hash, "include_dht_summary": include_dht_summary},
+            expect="network_metrics_dumped",
+        )
+
+    async def dump_network_stats(self) -> Any:
+        return await self._send("dump_network_stats", expect="network_stats_dumped")
+
+    async def list_wasm_host_functions(self) -> List[str]:
+        return await self._send(
+            "list_wasm_host_functions",
+            response_type=List[str],
+            expect="list_wasm_host_functions",
+        )
diff --git a/holochain_client/app/types.py b/holochain_client/app/types.py
new file mode 100644
index 0000000..5d8325f
--- /dev/null
+++ b/holochain_client/app/types.py
@@ -0,0 +1,26 @@
+"""Types specific to the app interface."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any
+
+from ..types.cell import CellId
+from ..types.common import ZomeName
+
+
+@dataclass
+class AppSignal:
+    """An application signal emitted by a cell via ``emit_signal``."""
+
+    cell_id: CellId
+    zome_name: ZomeName
+    # The emitted payload, MessagePack-decoded.
+    payload: Any
+
+
+@dataclass
+class SystemSignal:
+    """A system-emitted signal."""
+
+    value: Any
diff --git a/holochain_client/hash.py b/holochain_client/hash.py
new file mode 100644
index 0000000..a526117
--- /dev/null
+++ b/holochain_client/hash.py
@@ -0,0 +1,129 @@
+"""Holochain ``HoloHash`` types.
+
+A HoloHash is 39 bytes: a 3-byte multihash type prefix, a 32-byte hash
+("core"), and a 4-byte DHT location. They are modelled here as subclasses of
+``bytes`` so they serialize transparently as msgpack ``bin`` while still
+carrying type information and validation.
+
+The human readable form is multibase base64url (no padding) with a leading
+``u``, e.g. ``uhCkk...`` for an :class:`ActionHash`.
+"""
+
+from __future__ import annotations
+
+import base64
+
+# 3-byte multihash prefixes, from holo_hash/src/hash_type/primitive.rs
+AGENT_PREFIX = bytes([0x84, 0x20, 0x24])
+ENTRY_PREFIX = bytes([0x84, 0x21, 0x24])
+DHTOP_PREFIX = bytes([0x84, 0x24, 0x24])
+WARRANT_PREFIX = bytes([0x84, 0x2C, 0x24])
+DNA_PREFIX = bytes([0x84, 0x2D, 0x24])
+ACTION_PREFIX = bytes([0x84, 0x29, 0x24])
+WASM_PREFIX = bytes([0x84, 0x2A, 0x24])
+EXTERNAL_PREFIX = bytes([0x84, 0x2F, 0x24])
+
+HASH_LENGTH = 39
+PREFIX_LENGTH = 3
+CORE_LENGTH = 32
+LOCATION_LENGTH = 4
+
+
+class HoloHash(bytes):
+    """Base class for all 39-byte Holochain hashes.
+
+    Subclasses pin a specific 3-byte ``prefix``. ``HoloHash`` itself accepts any
+    valid 39-byte hash regardless of prefix.
+    """
+
+    prefix: bytes | None = None
+
+    def __new__(cls, value: bytes):
+        if len(value) != HASH_LENGTH:
+            raise ValueError(
+                f"{cls.__name__} must be {HASH_LENGTH} bytes, got {len(value)}"
+            )
+        if cls.prefix is not None and bytes(value[:PREFIX_LENGTH]) != cls.prefix:
+            raise ValueError(
+                f"{cls.__name__} expects prefix {list(cls.prefix)}, "
+                f"got {list(value[:PREFIX_LENGTH])}"
+            )
+        return super().__new__(cls, value)
+
+    @property
+    def core(self) -> bytes:
+        """The 32-byte hash, without prefix or location."""
+        return bytes(self[PREFIX_LENGTH : PREFIX_LENGTH + CORE_LENGTH])
+
+    @property
+    def location(self) -> bytes:
+        """The 4-byte DHT location suffix."""
+        return bytes(self[-LOCATION_LENGTH:])
+
+    def to_b64(self) -> str:
+        """Multibase base64url (no padding) form with leading ``u``."""
+        return "u" + base64.urlsafe_b64encode(self).decode("ascii").rstrip("=")
+
+    @classmethod
+    def from_b64(cls, value: str):
+        if value.startswith("u"):
+            value = value[1:]
+        padding = "=" * (-len(value) % 4)
+        return cls(base64.urlsafe_b64decode(value + padding))
+
+    def __repr__(self) -> str:
+        return f"{type(self).__name__}({self.to_b64()})"
+
+
+class AgentPubKey(HoloHash):
+    prefix = AGENT_PREFIX
+
+
+class EntryHash(HoloHash):
+    prefix = ENTRY_PREFIX
+
+
+class DhtOpHash(HoloHash):
+    prefix = DHTOP_PREFIX
+
+
+class WarrantHash(HoloHash):
+    prefix = WARRANT_PREFIX
+
+
+class DnaHash(HoloHash):
+    prefix = DNA_PREFIX
+
+
+class ActionHash(HoloHash):
+    prefix = ACTION_PREFIX
+
+
+class WasmHash(HoloHash):
+    prefix = WASM_PREFIX
+
+
+class ExternalHash(HoloHash):
+    prefix = EXTERNAL_PREFIX
+
+
+# AnyDhtHash can be an Entry or Action hash; AnyLinkableHash adds External.
+AnyDhtHash = HoloHash
+AnyLinkableHash = HoloHash
+
+_PREFIX_TO_CLASS = {
+    AGENT_PREFIX: AgentPubKey,
+    ENTRY_PREFIX: EntryHash,
+    DHTOP_PREFIX: DhtOpHash,
+    WARRANT_PREFIX: WarrantHash,
+    DNA_PREFIX: DnaHash,
+    ACTION_PREFIX: ActionHash,
+    WASM_PREFIX: WasmHash,
+    EXTERNAL_PREFIX: ExternalHash,
+}
+
+
+def hash_from_raw(value: bytes) -> HoloHash:
+    """Build the most specific ``HoloHash`` subclass for ``value`` by prefix."""
+    cls = _PREFIX_TO_CLASS.get(bytes(value[:PREFIX_LENGTH]), HoloHash)
+    return cls(value)
diff --git a/holochain_client/serde.py b/holochain_client/serde.py
new file mode 100644
index 0000000..09f4650
--- /dev/null
+++ b/holochain_client/serde.py
@@ -0,0 +1,261 @@
+"""Type-driven (de)serialization between Python models and Holochain's wire format.
+
+Holochain serializes with MessagePack via ``serde``. The conventions we mirror:
+
+* structs become maps keyed by ``snake_case`` field names;
+* enums are *adjacently tagged* as ``{"type": <variant>, "value": <content>}``
+  (the ``value`` key is absent for unit variants);
+* byte sequences (including ``HoloHash``) are msgpack ``bin``;
+* ``Option<T>`` is either the encoded ``T`` or ``nil``.
+
+Encoding (:func:`encode`) walks a Python object and produces msgpack-ready
+primitives. Decoding (:func:`decode`) is *target-typed*: the caller supplies the
+expected type, so we never have to guess a structure from its shape — the
+failure mode that made the previous client unreliable.
+"""
+
+from __future__ import annotations
+
+import dataclasses
+import enum
+import typing
+from typing import Any, Union, get_args, get_origin
+
+from .hash import HoloHash
+
+NoneType = type(None)
+
+
+# --------------------------------------------------------------------------- #
+# Protocol hooks
+# --------------------------------------------------------------------------- #
+# A type may implement custom wire behaviour with:
+#   * instance method ``__to_wire__(self) -> Any``
+#   * classmethod ``__from_wire__(cls, data: Any) -> instance``
+# These take precedence over the generic dataclass handling below.
+
+
+def encode(obj: Any) -> Any:
+    """Convert ``obj`` into msgpack-ready primitives."""
+    if obj is None:
+        return None
+    if isinstance(obj, HoloHash):
+        return bytes(obj)
+    if isinstance(obj, (bytes, bytearray)):
+        return bytes(obj)
+    if isinstance(obj, bool) or isinstance(obj, (int, float, str)):
+        return obj
+    if hasattr(obj, "__to_wire__"):
+        return obj.__to_wire__()
+    if isinstance(obj, enum.Enum):
+        # Plain C-like enums serialize as their snake_case name.
+        return obj.value if isinstance(obj.value, str) else obj.name
+    if dataclasses.is_dataclass(obj) and not isinstance(obj, type):
+        out: dict[str, Any] = {}
+        for f in dataclasses.fields(obj):
+            if f.metadata.get("skip"):
+                continue
+            wire_name = f.metadata.get("rename", f.name)
+            value = getattr(obj, f.name)
+            if value is None and f.metadata.get("omit_none"):
+                continue
+            out[wire_name] = encode(value)
+        return out
+    if isinstance(obj, dict):
+        return {k: encode(v) for k, v in obj.items()}
+    if isinstance(obj, (list, tuple)):
+        return [encode(v) for v in obj]
+    raise TypeError(f"Cannot encode object of type {type(obj)!r}")
+
+
+def decode(data: Any, typ: Any) -> Any:
+    """Decode msgpack-decoded ``data`` into the expected ``typ``."""
+    if typ is None or typ is Any or typ is NoneType:
+        return data
+
+    # Custom hook.
+    from_wire = getattr(typ, "__from_wire__", None)
+    if from_wire is not None and isinstance(typ, type):
+        return from_wire(data)
+
+    origin = get_origin(typ)
+
+    # Optional / Union.
+    if origin is Union:
+        args = [a for a in get_args(typ) if a is not NoneType]
+        if data is None:
+            return None
+        if len(args) == 1:
+            return decode(data, args[0])
+        # Best-effort for genuine unions: try each until one fits.
+        for arg in args:
+            try:
+                return decode(data, arg)
+            except Exception:
+                continue
+        return data
+
+    if origin in (list, typing.List):
+        (item_t,) = get_args(typ) or (Any,)
+        return [decode(v, item_t) for v in data]
+
+    if origin in (tuple, typing.Tuple):
+        args = get_args(typ)
+        if not args:
+            return tuple(data)
+        if len(args) == 2 and args[1] is Ellipsis:
+            return tuple(decode(v, args[0]) for v in data)
+        return tuple(decode(v, t) for v, t in zip(data, args))
+
+    if origin in (dict, typing.Dict):
+        args = get_args(typ) or (Any, Any)
+        kt, vt = args
+        return {decode(k, kt): decode(v, vt) for k, v in data.items()}
+
+    if isinstance(typ, type) and issubclass(typ, HoloHash):
+        if typ is HoloHash:
+            # A generic hash (e.g. AnyLinkableHash): resolve by its prefix.
+            from .hash import hash_from_raw
+
+            return hash_from_raw(data)
+        return typ(data)
+
+    if isinstance(typ, type) and issubclass(typ, enum.Enum):
+        try:
+            return typ(data)
+        except ValueError:
+            return typ[data]
+
+    if isinstance(typ, type) and dataclasses.is_dataclass(typ):
+        return _decode_dataclass(data, typ)
+
+    # Primitives and anything we don't specialise.
+    return data
+
+
+def _decode_dataclass(data: Any, typ: type) -> Any:
+    hints = typing.get_type_hints(typ)
+    kwargs: dict[str, Any] = {}
+    for f in dataclasses.fields(typ):
+        wire_name = f.metadata.get("rename", f.name)
+        if isinstance(data, dict) and wire_name in data:
+            kwargs[f.name] = decode(data[wire_name], hints.get(f.name, Any))
+        elif f.default is not dataclasses.MISSING:
+            kwargs[f.name] = f.default
+        elif f.default_factory is not dataclasses.MISSING:  # type: ignore[misc]
+            kwargs[f.name] = f.default_factory()
+        else:
+            kwargs[f.name] = None
+    return typ(**kwargs)
+
+
+# --------------------------------------------------------------------------- #
+# Adjacently-tagged unions (Rust enums)
+# --------------------------------------------------------------------------- #
+def variant(union: type, tag: str):
+    """Register a dataclass as a ``tag`` variant of an adjacently-tagged union.
+
+    Usage::
+
+        class CellInfo(TaggedUnion): ...
+
+        @variant(CellInfo, "provisioned")
+        @dataclass
+        class ProvisionedCell: ...
+    """
+
+    def register(cls):
+        union._variants[tag] = cls  # type: ignore[attr-defined]
+        cls._tag = tag
+        cls._union = union
+        cls.__to_wire__ = to_tagged
+        return cls
+
+    return register
+
+
+class TaggedUnion:
+    """Base for Rust enums that carry a variant tag.
+
+    Subclass it to declare a union, then attach variant dataclasses with
+    :func:`variant`. Three ``serde`` tagging styles are supported via class
+    attributes on the subclass:
+
+    * ``"adjacent"`` (default) — ``{tag_key: <variant>, content_key: <content>}``,
+      e.g. ``#[serde(tag = "type", content = "value")]``. Unit variants omit the
+      content key.
+    * ``"internal"`` — ``{tag_key: <variant>, ...fields}``: the variant's struct
+      fields are flattened alongside the tag, e.g. ``#[serde(tag = "type")]`` as
+      used by ``Action``.
+    * ``"external"`` — a bare string for unit variants, or ``{<variant>: content}``
+      for data-carrying variants (serde's default), as used by ``RecordEntry``.
+
+    ``tag_key``/``content_key`` default to ``"type"``/``"value"`` and can be
+    overridden (``Entry`` uses ``"entry_type"``/``"entry"``).
+    """
+
+    _variants: dict[str, type] = {}
+    style: str = "adjacent"
+    tag_key: str = "type"
+    content_key: str = "value"
+
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        cls._variants = {}
+
+    @classmethod
+    def __from_wire__(cls, data: Any) -> Any:
+        if cls.style == "external":
+            if isinstance(data, str):
+                tag, content = data, None
+            else:
+                tag = next(iter(data))
+                content = data[tag]
+        else:
+            tag = data[cls.tag_key]
+            content = data if cls.style == "internal" else data.get(cls.content_key)
+
+        target = cls._variants.get(tag)
+        if target is None:
+            raise ValueError(f"Unknown {cls.__name__} variant {tag!r}")
+
+        fields = dataclasses.fields(target)
+        if not fields:
+            return target()
+        if len(fields) == 1 and fields[0].metadata.get("newtype"):
+            hints = typing.get_type_hints(target)
+            return target(decode(content, hints[fields[0].name]))
+        return _decode_dataclass(content, target)
+
+
+def to_tagged(obj: Any) -> dict:
+    """Encode a tagged-union variant instance to its union's wire form."""
+    union = getattr(obj, "_union")
+    tag = getattr(obj, "_tag")
+    fields = dataclasses.fields(obj)
+
+    is_newtype = len(fields) == 1 and fields[0].metadata.get("newtype")
+    if is_newtype:
+        content: Any = encode(getattr(obj, fields[0].name))
+    elif fields:
+        # Encode the variant's fields as a map directly; calling encode(obj)
+        # here would re-enter __to_wire__ and recurse forever.
+        content = {
+            f.metadata.get("rename", f.name): encode(getattr(obj, f.name))
+            for f in fields
+            if not f.metadata.get("skip")
+        }
+    else:
+        content = None
+
+    if union.style == "external":
+        return tag if not fields else {tag: content}
+    if union.style == "internal":
+        out = {union.tag_key: tag}
+        if isinstance(content, dict):
+            out.update(content)
+        return out
+    out = {union.tag_key: tag}
+    if fields:
+        out[union.content_key] = content
+    return out
diff --git a/holochain_client/signing.py b/holochain_client/signing.py
new file mode 100644
index 0000000..83d6f82
--- /dev/null
+++ b/holochain_client/signing.py
@@ -0,0 +1,121 @@
+"""Client-side zome-call signing.
+
+Holochain authorizes zome calls with an ephemeral ed25519 *signing key* (not the
+agent's real key) that has been granted a capability on the conductor. To sign a
+call we serialize the :class:`ZomeCallParams` with MessagePack, SHA-512 the
+bytes, sign the hash, and transmit ``{bytes, signature}`` — the conductor
+verifies by hashing the bytes it received, so our encoding need only round-trip
+through its ``serde`` deserializer.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import secrets
+import time
+from dataclasses import dataclass
+from typing import Dict, Optional
+
+from nacl.signing import SigningKey
+
+from .hash import AGENT_PREFIX, AgentPubKey
+from .serde import encode
+from .types.cell import CellId
+from .types.common import CapSecret
+
+# Zome calls expire 5 minutes after signing, matching the JS client.
+NONCE_EXPIRY_SECONDS = 5 * 60
+
+
+class SigningKeyPair:
+    """An ephemeral ed25519 keypair plus its Holochain ``AgentPubKey`` form."""
+
+    def __init__(self, signing_key: Optional[SigningKey] = None):
+        self._signing_key = signing_key or SigningKey.generate()
+        public_key = bytes(self._signing_key.verify_key)
+        # A signing key is presented to Holochain as a 39-byte AgentPubKey:
+        # the agent prefix, the 32-byte public key, and a zeroed DHT location
+        # (the location is irrelevant for a signing-only identity).
+        self.agent_pub_key = AgentPubKey(AGENT_PREFIX + public_key + bytes(4))
+
+    def sign(self, data: bytes) -> bytes:
+        """Return the 64-byte detached ed25519 signature of ``data``."""
+        return self._signing_key.sign(data).signature
+
+
+@dataclass
+class SigningCredentials:
+    """Credentials authorizing zome calls for a single cell."""
+
+    cap_secret: CapSecret
+    signing_key: SigningKeyPair
+
+
+def random_cap_secret() -> CapSecret:
+    return secrets.token_bytes(64)
+
+
+def random_nonce() -> bytes:
+    return secrets.token_bytes(32)
+
+
+def nonce_expires_at() -> int:
+    """Expiry timestamp in microseconds since the Unix epoch."""
+    return (int(time.time() * 1000) + NONCE_EXPIRY_SECONDS * 1000) * 1000
+
+
+@dataclass
+class SignedZomeCall:
+    """The ``ZomeCallParamsSigned`` payload sent to the conductor."""
+
+    bytes: bytes
+    signature: bytes
+
+
+def sign_zome_call(
+    *,
+    cell_id: CellId,
+    zome_name: str,
+    fn_name: str,
+    payload: object,
+    provenance: AgentPubKey,
+    signing_key: SigningKeyPair,
+    cap_secret: Optional[CapSecret],
+    nonce: Optional[bytes] = None,
+    expires_at: Optional[int] = None,
+) -> SignedZomeCall:
+    """Serialize and sign a set of zome-call parameters.
+
+    ``payload`` is the (already application-shaped) zome input; it is itself
+    MessagePack-encoded before being embedded in the params, matching Holochain's
+    ``ExternIO`` field.
+    """
+    import msgpack
+
+    params = {
+        "provenance": bytes(provenance),
+        "cell_id": [bytes(cell_id.dna_hash), bytes(cell_id.agent_pub_key)],
+        "zome_name": zome_name,
+        "fn_name": fn_name,
+        "cap_secret": cap_secret,
+        "payload": msgpack.packb(encode(payload), use_bin_type=True),
+        "nonce": nonce if nonce is not None else random_nonce(),
+        "expires_at": expires_at if expires_at is not None else nonce_expires_at(),
+    }
+    data = msgpack.packb(params, use_bin_type=True)
+    bytes_hash = hashlib.sha512(data).digest()
+    signature = signing_key.sign(bytes_hash)
+    return SignedZomeCall(bytes=data, signature=signature)
+
+
+class CredentialStore:
+    """In-memory store of :class:`SigningCredentials`, keyed by cell."""
+
+    def __init__(self):
+        self._store: Dict[CellId, SigningCredentials] = {}
+
+    def set(self, cell_id: CellId, credentials: SigningCredentials) -> None:
+        self._store[cell_id] = credentials
+
+    def get(self, cell_id: CellId) -> Optional[SigningCredentials]:
+        return self._store.get(cell_id)
diff --git a/holochain_client/api/__init__.py b/holochain_client/types/__init__.py
similarity index 100%
rename from holochain_client/api/__init__.py
rename to holochain_client/types/__init__.py
diff --git a/holochain_client/types/app.py b/holochain_client/types/app.py
new file mode 100644
index 0000000..5590c61
--- /dev/null
+++ b/holochain_client/types/app.py
@@ -0,0 +1,88 @@
+"""Application-level types: ``AppInfo``, ``AppStatus``, app interface info."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Dict, List, Optional
+
+from ..hash import AgentPubKey
+from ..serde import TaggedUnion, variant
+from .cell import CellInfo
+from .common import InstalledAppId, RoleName, Timestamp
+
+
+def _newtype(typ):
+    """Field for a single-payload (newtype) enum variant."""
+    return field(metadata={"newtype": True})
+
+
+class DisabledAppReason(TaggedUnion):
+    """Why an app is disabled."""
+
+
+@variant(DisabledAppReason, "never_started")
+@dataclass
+class NeverStarted:
+    pass
+
+
+@variant(DisabledAppReason, "not_started_after_providing_memproofs")
+@dataclass
+class NotStartedAfterProvidingMemproofs:
+    pass
+
+
+@variant(DisabledAppReason, "user")
+@dataclass
+class DisabledByUser:
+    pass
+
+
+@variant(DisabledAppReason, "error")
+@dataclass
+class DisabledByError:
+    message: str = _newtype(str)
+
+
+class AppStatus(TaggedUnion):
+    """An app's lifecycle status."""
+
+
+@variant(AppStatus, "enabled")
+@dataclass
+class AppEnabled:
+    pass
+
+
+@variant(AppStatus, "disabled")
+@dataclass
+class AppDisabled:
+    reason: DisabledAppReason = _newtype(DisabledAppReason)
+
+
+@variant(AppStatus, "awaiting_memproofs")
+@dataclass
+class AppAwaitingMemproofs:
+    pass
+
+
+@dataclass
+class AppInfo:
+    """Information about an installed app."""
+
+    installed_app_id: InstalledAppId
+    cell_info: Dict[RoleName, List[CellInfo]]
+    status: AppStatus
+    agent_pub_key: AgentPubKey
+    # The original ``AppManifest`` is left as a decoded structure (pass-through).
+    manifest: Any
+    installed_at: Timestamp
+
+
+@dataclass
+class AppInterfaceInfo:
+    """An attached app interface, as listed by ``list_app_interfaces``."""
+
+    port: int
+    allowed_origins: Any
+    installed_app_id: Optional[InstalledAppId] = None
diff --git a/holochain_client/types/capability.py b/holochain_client/types/capability.py
new file mode 100644
index 0000000..d778b2f
--- /dev/null
+++ b/holochain_client/types/capability.py
@@ -0,0 +1,67 @@
+"""Capability grant types for authorizing zome calls."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import List, Tuple
+
+from ..hash import AgentPubKey
+from ..serde import TaggedUnion, variant
+from .cell import CellId
+from .common import CapSecret, FunctionName, ZomeName
+
+GrantedFunction = Tuple[ZomeName, FunctionName]
+
+
+class GrantedFunctions(TaggedUnion):
+    """Which zome functions a capability grants access to."""
+
+
+@variant(GrantedFunctions, "all")
+@dataclass
+class GrantedFunctionsAll:
+    pass
+
+
+@variant(GrantedFunctions, "listed")
+@dataclass
+class GrantedFunctionsListed:
+    functions: List[GrantedFunction] = field(metadata={"newtype": True})
+
+
+class CapAccess(TaggedUnion):
+    """Access requirements for a capability grant."""
+
+
+@variant(CapAccess, "unrestricted")
+@dataclass
+class CapAccessUnrestricted:
+    pass
+
+
+@variant(CapAccess, "transferable")
+@dataclass
+class CapAccessTransferable:
+    secret: CapSecret
+
+
+@variant(CapAccess, "assigned")
+@dataclass
+class CapAccessAssigned:
+    secret: CapSecret
+    assignees: List[AgentPubKey]
+
+
+@dataclass
+class ZomeCallCapGrant:
+    """A capability grant for making zome calls."""
+
+    tag: str
+    access: CapAccess
+    functions: GrantedFunctions
+
+
+@dataclass
+class GrantZomeCallCapabilityPayload:
+    cell_id: CellId
+    cap_grant: ZomeCallCapGrant
diff --git a/holochain_client/types/cell.py b/holochain_client/types/cell.py
new file mode 100644
index 0000000..f7646f9
--- /dev/null
+++ b/holochain_client/types/cell.py
@@ -0,0 +1,75 @@
+"""Cell-related types: ``CellId``, DNA modifiers, and ``CellInfo``."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any, Optional
+
+from ..hash import AgentPubKey, DnaHash
+from ..serde import TaggedUnion, variant
+from .common import NetworkSeed
+
+# A clone cell identifier, formatted ``<role_name>.<index>``.
+CloneId = str
+
+
+@dataclass(frozen=True)
+class CellId:
+    """Identifies a cell: a ``(DnaHash, AgentPubKey)`` pair.
+
+    Serializes as a 2-element array, matching Rust's tuple-struct ``CellId``.
+    """
+
+    dna_hash: DnaHash
+    agent_pub_key: AgentPubKey
+
+    def __to_wire__(self) -> list:
+        return [bytes(self.dna_hash), bytes(self.agent_pub_key)]
+
+    @classmethod
+    def __from_wire__(cls, data: Any) -> "CellId":
+        return cls(DnaHash(data[0]), AgentPubKey(data[1]))
+
+
+@dataclass
+class DnaModifiers:
+    """Modifiers that, together with the integrity zomes, define a DNA hash."""
+
+    network_seed: NetworkSeed
+    # ``SerializedBytes`` of the DNA properties (msgpack-encoded), or ``None``.
+    properties: Optional[bytes] = None
+
+
+class CellInfo(TaggedUnion):
+    """Information about a cell, as returned in ``AppInfo``."""
+
+
+@variant(CellInfo, "provisioned")
+@dataclass
+class ProvisionedCell:
+    cell_id: CellId
+    dna_modifiers: DnaModifiers
+    name: str
+
+
+@variant(CellInfo, "cloned")
+@dataclass
+class ClonedCell:
+    cell_id: CellId
+    clone_id: CloneId
+    original_dna_hash: DnaHash
+    dna_modifiers: DnaModifiers
+    name: str
+    enabled: bool
+
+
+@variant(CellInfo, "stem")
+@dataclass
+class StemCell:
+    original_dna_hash: DnaHash
+    dna_modifiers: DnaModifiers
+    name: Optional[str] = None
+
+
+def decode_cell_info(data: Any) -> Any:
+    return CellInfo.__from_wire__(data)
diff --git a/holochain_client/types/common.py b/holochain_client/types/common.py
new file mode 100644
index 0000000..fe1e7dd
--- /dev/null
+++ b/holochain_client/types/common.py
@@ -0,0 +1,22 @@
+"""Common scalar type aliases shared across the conductor API.
+
+These mirror the Rust newtypes/aliases. They are documentation-only aliases:
+the wire representation is the underlying primitive.
+"""
+
+from __future__ import annotations
+
+# String identifiers.
+ZomeName = str
+FunctionName = str
+RoleName = str
+InstalledAppId = str
+NetworkSeed = str
+
+# Microseconds since the Unix epoch (Holochain ``Timestamp``).
+Timestamp = int
+
+# Raw byte secrets / tokens.
+CapSecret = bytes  # 64 bytes
+Nonce = bytes  # 32 bytes
+AppAuthenticationToken = bytes
diff --git a/holochain_client/types/record.py b/holochain_client/types/record.py
new file mode 100644
index 0000000..e5d3a78
--- /dev/null
+++ b/holochain_client/types/record.py
@@ -0,0 +1,327 @@
+"""Source-chain ``Record`` types: ``Action`` (and its variants), ``Entry``, and
+the wrappers that tie them together.
+
+Zome calls return application data as opaque MessagePack, so the client cannot
+type those results automatically. When a zome returns a ``Record`` (or a list of
+them), decode it explicitly::
+
+    from holochain_client.types.record import Record, decode_record
+
+    raw = await app.call_zome(cell_id, "my_zome", "get_thing", action_hash)
+    record = decode_record(raw)
+    record.signed_action.hashed.hash          # ActionHash
+    record.action()                            # the Action variant
+    record.entry                               # RecordEntry
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, List, Optional
+
+from ..hash import (
+    ActionHash,
+    AgentPubKey,
+    AnyLinkableHash,
+    DnaHash,
+    EntryHash,
+)
+from ..serde import TaggedUnion, decode, variant
+from .common import Timestamp
+
+# Entry visibility serializes as the bare string "Public" / "Private".
+EntryVisibility = str
+
+# A signature is 64 raw bytes; link tags are arbitrary bytes.
+Signature = bytes
+LinkTag = bytes
+
+
+def _newtype():
+    return field(metadata={"newtype": True})
+
+
+# --------------------------------------------------------------------------- #
+# Entry
+# --------------------------------------------------------------------------- #
+class MigrationTarget(TaggedUnion):
+    style = "external"
+
+
+@variant(MigrationTarget, "Dna")
+@dataclass
+class MigrationToDna:
+    dna_hash: DnaHash = _newtype()
+
+
+@variant(MigrationTarget, "Agent")
+@dataclass
+class MigrationToAgent:
+    agent: AgentPubKey = _newtype()
+
+
+@dataclass
+class AppEntryDef:
+    entry_index: int
+    zome_index: int
+    visibility: EntryVisibility
+
+
+class EntryType(TaggedUnion):
+    style = "external"
+
+
+@variant(EntryType, "AgentPubKey")
+@dataclass
+class EntryTypeAgentPubKey:
+    pass
+
+
+@variant(EntryType, "App")
+@dataclass
+class EntryTypeApp:
+    app_entry_def: AppEntryDef = _newtype()
+
+
+@variant(EntryType, "CapClaim")
+@dataclass
+class EntryTypeCapClaim:
+    pass
+
+
+@variant(EntryType, "CapGrant")
+@dataclass
+class EntryTypeCapGrant:
+    pass
+
+
+class Entry(TaggedUnion):
+    """A source-chain entry. Serialized with ``tag = "entry_type"``."""
+
+    tag_key = "entry_type"
+    content_key = "entry"
+
+
+@variant(Entry, "Agent")
+@dataclass
+class AgentEntry:
+    agent: AgentPubKey = _newtype()
+
+
+@variant(Entry, "App")
+@dataclass
+class AppEntry:
+    """App entry bytes (MessagePack of the application entry)."""
+
+    bytes: bytes = _newtype()
+
+
+@variant(Entry, "CapClaim")
+@dataclass
+class CapClaimEntry:
+    value: Any = _newtype()
+
+
+@variant(Entry, "CapGrant")
+@dataclass
+class CapGrantEntry:
+    value: Any = _newtype()
+
+
+# --------------------------------------------------------------------------- #
+# Action variants (internally tagged: {"type": <variant>, ...fields})
+# --------------------------------------------------------------------------- #
+class Action(TaggedUnion):
+    """A source-chain action."""
+
+    style = "internal"
+
+
+@variant(Action, "Dna")
+@dataclass
+class Dna:
+    author: AgentPubKey
+    timestamp: Timestamp
+    hash: DnaHash
+
+
+@variant(Action, "AgentValidationPkg")
+@dataclass
+class AgentValidationPkg:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    membrane_proof: Optional[bytes] = None
+
+
+@variant(Action, "InitZomesComplete")
+@dataclass
+class InitZomesComplete:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+
+
+@variant(Action, "CreateLink")
+@dataclass
+class CreateLink:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    base_address: AnyLinkableHash
+    target_address: AnyLinkableHash
+    zome_index: int
+    link_type: int
+    tag: LinkTag
+    weight: Any = None
+
+
+@variant(Action, "DeleteLink")
+@dataclass
+class DeleteLink:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    base_address: AnyLinkableHash
+    link_add_address: ActionHash
+
+
+@variant(Action, "CloseChain")
+@dataclass
+class CloseChain:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    new_target: Optional[MigrationTarget] = None
+
+
+@variant(Action, "OpenChain")
+@dataclass
+class OpenChain:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    prev_target: MigrationTarget
+    close_hash: ActionHash
+
+
+@variant(Action, "Create")
+@dataclass
+class Create:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    entry_type: EntryType
+    entry_hash: EntryHash
+    weight: Any = None
+
+
+@variant(Action, "Update")
+@dataclass
+class Update:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    original_action_address: ActionHash
+    original_entry_address: EntryHash
+    entry_type: EntryType
+    entry_hash: EntryHash
+    weight: Any = None
+
+
+@variant(Action, "Delete")
+@dataclass
+class Delete:
+    author: AgentPubKey
+    timestamp: Timestamp
+    action_seq: int
+    prev_action: ActionHash
+    deletes_address: ActionHash
+    deletes_entry_address: EntryHash
+    weight: Any = None
+
+
+# --------------------------------------------------------------------------- #
+# Record
+# --------------------------------------------------------------------------- #
+@dataclass
+class ActionHashed:
+    """An ``Action`` paired with its ``ActionHash`` (``HoloHashed<Action>``)."""
+
+    content: Action
+    hash: ActionHash
+
+
+@dataclass
+class SignedActionHashed:
+    hashed: ActionHashed
+    signature: Signature
+
+
+class RecordEntry(TaggedUnion):
+    """The entry component of a record: present, hidden, absent, or not stored."""
+
+    style = "external"
+
+
+@variant(RecordEntry, "Present")
+@dataclass
+class EntryPresent:
+    entry: Entry = _newtype()
+
+
+@variant(RecordEntry, "Hidden")
+@dataclass
+class EntryHidden:
+    pass
+
+
+@variant(RecordEntry, "NA")
+@dataclass
+class EntryNotApplicable:
+    pass
+
+
+@variant(RecordEntry, "NotStored")
+@dataclass
+class EntryNotStored:
+    pass
+
+
+@dataclass
+class Record:
+    """A chain record: a signed action and, if applicable, its entry."""
+
+    signed_action: SignedActionHashed
+    entry: RecordEntry
+
+    def action(self) -> Any:
+        """The decoded ``Action`` variant for this record."""
+        return self.signed_action.hashed.content
+
+    def action_hash(self) -> ActionHash:
+        return self.signed_action.hashed.hash
+
+    def entry_value(self) -> Optional[Entry]:
+        """The ``Entry`` if one is present, else ``None``."""
+        if isinstance(self.entry, EntryPresent):
+            return self.entry.entry
+        return None
+
+
+def decode_record(data: Any) -> Record:
+    """Decode raw MessagePack-decoded data into a :class:`Record`."""
+    return decode(data, Record)
+
+
+def decode_records(data: Any) -> List[Record]:
+    """Decode a list of records."""
+    return [decode_record(item) for item in data]
diff --git a/poetry.lock b/poetry.lock
deleted file mode 100644
index 451f8f2..0000000
--- a/poetry.lock
+++ /dev/null
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-    {file = "websockets-12.0-py3-none-any.whl", hash = "sha256:dc284bbc8d7c78a6c69e0c7325ab46ee5e40bb4d50e494d8131a07ef47500e9e"},
-    {file = "websockets-12.0.tar.gz", hash = "sha256:81df9cbcbb6c260de1e007e58c011bfebe2dafc8435107b0537f393dd38c8b1b"},
-]
-
-[metadata]
-lock-version = "2.0"
-python-versions = "^3.8"
-content-hash = "d515c8c47af8495ad8e9056cbcf9bb0737e1ad3d03f6f5c97cba0d7b6badca8e"
diff --git a/pyproject.toml b/pyproject.toml
index d0785be..90753e6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,20 +15,24 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.8"
+python = "^3.10"
 msgpack = "^1.0.7"
-websockets = "^12.0"
-holochain-serialization = "^0.1.0"
-cryptography = "^42.0.2"
-ruff = "^0.2.1"
-
-[tool.poetry.group.test.dependencies]
-pytest = "^7.0.0"
-
+websockets = "^13.0"
+pynacl = "^1.5.0"
 
 [tool.poetry.group.dev.dependencies]
-pytest-asyncio = "^0.23.4"
+ruff = "^0.6.0"
+pytest = "^8.0.0"
+pytest-asyncio = "^0.24.0"
 
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "session"
+testpaths = ["tests"]
+
+[tool.ruff]
+target-version = "py310"
diff --git a/holochain_client/api/admin/__init__.py b/tests/admin/__init__.py
similarity index 100%
rename from holochain_client/api/admin/__init__.py
rename to tests/admin/__init__.py
diff --git a/tests/admin/test_admin.py b/tests/admin/test_admin.py
new file mode 100644
index 0000000..51ed662
--- /dev/null
+++ b/tests/admin/test_admin.py
@@ -0,0 +1,44 @@
+"""Admin interface integration tests (require a running conductor)."""
+
+import pytest
+
+from holochain_client.hash import AgentPubKey, DnaHash
+from holochain_client.types.app import AppInfo
+from holochain_client.types.cell import CellId
+
+pytestmark = pytest.mark.asyncio(loop_scope="session")
+
+
+async def test_list_dnas(harness):
+    dnas = await harness.admin.list_dnas()
+    assert len(dnas) == 1
+    assert isinstance(dnas[0], DnaHash)
+
+
+async def test_list_cell_ids(harness):
+    cell_ids = await harness.admin.list_cell_ids()
+    assert harness.cell_id in cell_ids
+    assert all(isinstance(c, CellId) for c in cell_ids)
+
+
+async def test_list_apps(harness):
+    apps = await harness.admin.list_apps()
+    assert any(app.installed_app_id == harness.installed_app_id for app in apps)
+    assert all(isinstance(app, AppInfo) for app in apps)
+
+
+async def test_generate_agent_pub_key(harness):
+    key = await harness.admin.generate_agent_pub_key()
+    assert isinstance(key, AgentPubKey)
+    assert len(key) == 39
+
+
+async def test_get_dna_definition(harness):
+    definition = await harness.admin.get_dna_definition(harness.cell_id)
+    assert definition["name"] == "fixture"
+
+
+async def test_list_app_interfaces(harness):
+    interfaces = await harness.admin.list_app_interfaces()
+    assert len(interfaces) >= 1
+    assert all(i.port > 0 for i in interfaces)
diff --git a/tests/api/__init__.py b/tests/api/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/api/admin/__init__.py b/tests/api/admin/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/api/admin/client_test.py b/tests/api/admin/client_test.py
deleted file mode 100644
index d1efc80..0000000
--- a/tests/api/admin/client_test.py
+++ /dev/null
@@ -1,203 +0,0 @@
-import pytest
-from holochain_client.api.admin.types import (
-    AddAdminInterface,
-    DisableApp,
-    DnaModifiers,
-    EnableApp,
-    InterfaceDriverWebsocket,
-    InstallApp,
-    RegisterDnaPayloadHash,
-    RegisterDnaPayloadPath,
-    UninstallApp,
-)
-from holochain_client.api.admin.client import AdminClient
-from tests.harness import TestHarness
-
-
-@pytest.mark.asyncio
-async def test_add_admin_interface():
-    async with TestHarness() as harness:
-        # Get a free port
-        import socket
-
-        sock = socket.socket()
-        sock.bind(("", 0))
-        port = sock.getsockname()[1]
-        sock.close()
-
-        await harness.admin_client.add_admin_interfaces(
-            [AddAdminInterface(InterfaceDriverWebsocket(port))]
-        )
-
-        new_admin_client = await AdminClient.create(f"ws://localhost:{port}")
-
-        agent_pub_key = await new_admin_client.generate_agent_pub_key()
-        await new_admin_client.close()
-        assert len(agent_pub_key) == 39
-
-
-@pytest.mark.asyncio
-async def test_register_dna():
-    async with TestHarness() as harness:
-        dna_hash = await harness.admin_client.register_dna(
-            RegisterDnaPayloadPath(harness.fixture_dna_path)
-        )
-        assert len(dna_hash) == 39
-
-        dna_hash_alt = await harness.admin_client.register_dna(
-            RegisterDnaPayloadHash(dna_hash, DnaModifiers(network_seed="testing"))
-        )
-        assert len(dna_hash_alt) == 39
-        assert dna_hash != dna_hash_alt
-
-
-@pytest.mark.asyncio
-async def test_get_dna_definition():
-    async with TestHarness() as harness:
-        dna_hash = await harness.admin_client.register_dna(
-            RegisterDnaPayloadPath(harness.fixture_dna_path)
-        )
-        assert len(dna_hash) == 39
-
-        dna_def = await harness.admin_client.get_dna_definition(dna_hash)
-        assert "name" in dna_def
-        assert dna_def["name"] == "fixture"
-
-
-@pytest.mark.asyncio
-async def test_install_app():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        response = await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        assert response.installed_app_id == "test_app"
-
-
-@pytest.mark.asyncio
-async def test_uninstall_app():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        assert len(await harness.admin_client.list_apps()) == 1
-
-        await harness.admin_client.uninstall_app(UninstallApp("test_app"))
-
-        assert len(await harness.admin_client.list_apps()) == 0
-
-
-@pytest.mark.asyncio
-async def test_list_dnas():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        assert len(await harness.admin_client.list_dnas()) == 1
-
-
-@pytest.mark.asyncio
-async def test_list_cell_ids():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        # Lists running only, so should be empty before enabling
-        cell_ids = await harness.admin_client.list_cell_ids()
-        assert len(cell_ids) == 0
-
-        await harness.admin_client.enable_app(EnableApp("test_app"))
-
-        cell_ids = await harness.admin_client.list_cell_ids()
-        assert len(cell_ids) == 1
-        assert cell_ids[0][0] == (await harness.admin_client.list_dnas())[0]
-        assert cell_ids[0][1] == agent_pub_key
-
-
-@pytest.mark.asyncio
-async def test_list_apps():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        apps = await harness.admin_client.list_apps()
-        assert apps[0].agent_pub_key == agent_pub_key
-        assert apps[0].installed_app_id == "test_app"
-
-
-@pytest.mark.asyncio
-async def test_enable_and_disable_app():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        app_info = (await harness.admin_client.list_apps())[0]
-        assert "disabled" in app_info.status
-
-        await harness.admin_client.enable_app(EnableApp("test_app"))
-
-        app_info = (await harness.admin_client.list_apps())[0]
-        assert "running" in app_info.status
-
-        await harness.admin_client.disable_app(DisableApp("test_app"))
-
-        app_info = (await harness.admin_client.list_apps())[0]
-        assert "disabled" in app_info.status
-
-
-@pytest.mark.asyncio
-async def test_attach_app_interface():
-    async with TestHarness() as harness:
-        app_interface = await harness.admin_client.attach_app_interface()
-        assert app_interface.port > 0
-
-        listed = await harness.admin_client.list_app_interfaces()
-        assert app_interface.port in listed
-
-
-@pytest.mark.asyncio
-async def test_dump_network_stats():
-    async with TestHarness() as harness:
-        network_stats = await harness.admin_client.dump_network_stats()
-        print("network stats: ", network_stats)
diff --git a/tests/api/admin/signing_test.py b/tests/api/admin/signing_test.py
deleted file mode 100644
index c47d969..0000000
--- a/tests/api/admin/signing_test.py
+++ /dev/null
@@ -1,39 +0,0 @@
-from holochain_client.api.common.signing import (
-    authorize_signing_credentials,
-    generate_signing_keypair,
-)
-import pytest
-from holochain_client.api.admin.types import EnableApp, InstallApp
-
-from tests.harness import TestHarness
-
-
-def test_generate_signing_keypair():
-    signing_keypair = generate_signing_keypair()
-    assert len(signing_keypair.identity) == 39
-
-
-@pytest.mark.asyncio
-async def test_authorize_signing_credentials():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        response = await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        await harness.admin_client.enable_app(
-            EnableApp(installed_app_id=response.installed_app_id)
-        )
-
-        await authorize_signing_credentials(
-            harness.admin_client,
-            response.cell_info["fixture"][0]["provisioned"]["cell_id"],
-            None,
-        )
-
-        assert response.installed_app_id == "test_app"
diff --git a/tests/api/app/client_test.py b/tests/api/app/client_test.py
deleted file mode 100644
index f18d555..0000000
--- a/tests/api/app/client_test.py
+++ /dev/null
@@ -1,43 +0,0 @@
-import pytest
-from holochain_client.api.admin.types import (
-    EnableApp,
-    InstallApp,
-)
-from holochain_client.api.app.types import ZomeCallUnsigned
-from holochain_client.api.common.signing import authorize_signing_credentials
-from tests.harness import TestHarness
-import msgpack
-
-
-@pytest.mark.asyncio
-async def test_call_zome():
-    async with TestHarness() as harness:
-        agent_pub_key = await harness.admin_client.generate_agent_pub_key()
-
-        app_info = await harness.admin_client.install_app(
-            InstallApp(
-                agent_key=agent_pub_key,
-                installed_app_id="test_app",
-                path=harness.fixture_path,
-            )
-        )
-
-        await harness.admin_client.enable_app(EnableApp(app_info.installed_app_id))
-
-        cell_id = app_info.cell_info["fixture"][0]["provisioned"]["cell_id"]
-        await authorize_signing_credentials(harness.admin_client, cell_id)
-
-        response = await harness.app_client.call_zome(
-            ZomeCallUnsigned(
-                cell_id=cell_id,
-                zome_name="fixture",
-                fn_name="create_fixture",
-                payload=msgpack.packb({"name": "hello fixture"}),
-            )
-        )
-
-        response_struct = msgpack.unpackb(response)
-        assert (
-            response_struct["signed_action"]["hashed"]["content"]["author"]
-            == agent_pub_key
-        )
diff --git a/holochain_client/api/app/__init__.py b/tests/app/__init__.py
similarity index 100%
rename from holochain_client/api/app/__init__.py
rename to tests/app/__init__.py
diff --git a/tests/app/test_zome_call.py b/tests/app/test_zome_call.py
new file mode 100644
index 0000000..d2b365d
--- /dev/null
+++ b/tests/app/test_zome_call.py
@@ -0,0 +1,64 @@
+"""App interface and zome-call integration tests (require a running conductor)."""
+
+import asyncio
+
+import msgpack
+import pytest
+
+from holochain_client.hash import ActionHash
+from holochain_client.types.record import AppEntry, Create, decode_record
+
+pytestmark = pytest.mark.asyncio(loop_scope="session")
+
+
+async def test_echo(harness):
+    result = await harness.app.call_zome(harness.cell_id, "fixture", "echo", "hello")
+    assert result == "hello"
+
+
+async def test_app_info(harness):
+    info = await harness.app.app_info()
+    assert info is not None
+    assert info.installed_app_id == harness.installed_app_id
+    assert "fixture" in info.cell_info
+
+
+async def test_create_and_get_fixture(harness):
+    raw = await harness.app.call_zome(
+        harness.cell_id, "fixture", "create_fixture", {"value": "first"}
+    )
+    # The created Record decodes into typed Action/Entry models.
+    record = decode_record(raw)
+    assert isinstance(record.action(), Create)
+    assert isinstance(record.action_hash(), ActionHash)
+    entry = record.entry_value()
+    assert isinstance(entry, AppEntry)
+    assert msgpack.unpackb(entry.bytes, raw=False) == {"value": "first"}
+
+    fetched = decode_record(
+        await harness.app.call_zome(
+            harness.cell_id, "fixture", "get_fixture", record.action_hash()
+        )
+    )
+    assert fetched.action_hash() == record.action_hash()
+
+
+async def test_get_all_fixtures(harness):
+    await harness.app.call_zome(
+        harness.cell_id, "fixture", "create_fixture", {"value": "linked"}
+    )
+    links = await harness.app.call_zome(
+        harness.cell_id, "fixture", "get_all_fixtures", None
+    )
+    assert isinstance(links, list)
+    assert len(links) >= 1
+
+
+async def test_signal_delivery(harness):
+    received: asyncio.Queue = asyncio.Queue()
+    harness.app.on_signal(lambda signal: received.put_nowait(signal))
+
+    await harness.app.call_zome(harness.cell_id, "fixture", "emit", "ping")
+
+    signal = await asyncio.wait_for(received.get(), timeout=10)
+    assert signal.payload["value"] == "ping"
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..356e0d6
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,9 @@
+import pytest_asyncio
+
+from tests.harness import Harness
+
+
+@pytest_asyncio.fixture(loop_scope="session", scope="session")
+async def harness():
+    async with Harness() as h:
+        yield h
diff --git a/tests/harness.py b/tests/harness.py
index 89d0451..e0f7ef6 100644
--- a/tests/harness.py
+++ b/tests/harness.py
@@ -1,79 +1,121 @@
-from subprocess import Popen, run, PIPE
-import signal
-import re
+"""Test harness that boots a real Holochain conductor sandbox.
+
+Requires the ``hc`` and ``holochain`` binaries on ``PATH`` (provided by Holonix
+in CI). The fixture hApp must be built first (``cd fixture && npm run
+build:happ``).
+"""
+
+from __future__ import annotations
+
 import json
-from typing import Tuple
-from holochain_client.api.admin.client import AdminClient
+import os
+import re
+import signal
+import subprocess
 from pathlib import Path
-from os import path
+from typing import Optional, Tuple
 
-from holochain_client.api.app.client import AppClient
+from holochain_client.admin import AdminClient
+from holochain_client.app import AppClient
+from holochain_client.types.cell import CellId, ProvisionedCell
 
+FIXTURE_HAPP = (Path(__file__).parent / "../fixture/workdir/fixture.happ").resolve()
+PASSPHRASE = "test-phrase\n"
 
-class TestHarness:
-    admin_client: AdminClient
-    app_client: AppClient
-    fixture_path: str
 
-    async def __aenter__(self):
-        (self._sandbox_process, admin_port) = _start_holochain()
-        self.admin_client = await AdminClient.create(f"ws://localhost:{admin_port}")
+class Harness:
+    """A running conductor with the fixture app installed and connected."""
 
-        app_interface = await self.admin_client.attach_app_interface()
-        self.app_client = await AppClient.create(f"ws://localhost:{app_interface.port}")
+    admin: AdminClient
+    app: AppClient
+    cell_id: CellId
+    installed_app_id: str
 
-        fixture_path = (
-            Path(__file__).parent / "../fixture/workdir/fixture.happ"
-        ).resolve()
-        if not path.exists(fixture_path):
-            raise Exception(
-                "Fixture does not exist, please build it before running this test"
-            )
-        self.fixture_path = str(fixture_path)
-
-        fixture_dna_path = (
-            Path(__file__).parent / "../fixture/dnas/fixture/workdir/fixture.dna"
-        ).resolve()
-        if not path.exists(fixture_dna_path):
-            raise Exception(
-                "Fixture DNA does not exist, please build it before running this test"
+    def __init__(self):
+        self._process: Optional[subprocess.Popen] = None
+
+    async def __aenter__(self) -> "Harness":
+        if not FIXTURE_HAPP.exists():
+            raise RuntimeError(
+                f"fixture hApp not found at {FIXTURE_HAPP}; build it with "
+                "`cd fixture && npm run build:happ`"
             )
-        self.fixture_dna_path = str(fixture_dna_path)
+        # ``HC_ADMIN_PORT`` lets the suite run against an already-running
+        # conductor instead of spawning one (useful where spawning is awkward).
+        existing_port = os.environ.get("HC_ADMIN_PORT")
+        if existing_port:
+            admin_port = int(existing_port)
+        else:
+            self._process, admin_port = _start_conductor()
 
+        self.admin = await AdminClient.connect(f"ws://localhost:{admin_port}")
+        self.installed_app_id = "fixture"
+        try:
+            await self.admin.uninstall_app(self.installed_app_id, force=True)
+        except Exception:
+            pass
+        app_info = await self.admin.install_app(
+            _bundle_source(),
+            installed_app_id=self.installed_app_id,
+        )
+        await self.admin.enable_app(self.installed_app_id)
+
+        provisioned = app_info.cell_info["fixture"][0]
+        assert isinstance(provisioned, ProvisionedCell)
+        self.cell_id = provisioned.cell_id
+
+        app_port = await self.admin.attach_app_interface(allowed_origins="*")
+        token = await self.admin.issue_app_authentication_token(self.installed_app_id)
+        self.app = await AppClient.connect(f"ws://localhost:{app_port}", token.token)
+
+        credentials = await self.admin.authorize_signing_credentials(self.cell_id)
+        self.app.credentials.set(self.cell_id, credentials)
         return self
 
-    async def __aexit__(self, exc_type, exc, tb):
-        del exc_type, exc, tb
-        await self.app_client.close()
-        await self.admin_client.close()
-        self._sandbox_process.send_signal(signal.SIGINT)
+    async def __aexit__(self, exc_type, exc, tb) -> None:
+        try:
+            await self.app.close()
+            await self.admin.close()
+        finally:
+            if self._process is not None:
+                self._process.send_signal(signal.SIGINT)
+                try:
+                    self._process.wait(timeout=15)
+                except subprocess.TimeoutExpired:
+                    self._process.kill()
+
 
+def _bundle_source():
+    from holochain_client.admin.types import AppBundleBytes
 
-def _start_holochain() -> Tuple[Popen, int]:
-    ps = run(["hc", "sandbox", "clean"])
-    if ps.returncode != 0:
-        raise Exception("Failed to clean sandbox")
+    return AppBundleBytes(bundle=FIXTURE_HAPP.read_bytes())
 
-    ps = run(
+
+def _start_conductor() -> Tuple[subprocess.Popen, int]:
+    subprocess.run(["hc", "sandbox", "clean"], check=False)
+    created = subprocess.run(
         ["hc", "sandbox", "--piped", "create", "--in-process-lair"],
+        input=PASSPHRASE,
         text=True,
-        input="passphrase\n",
     )
-    if ps.returncode != 0:
-        raise Exception("Failed to create sandbox")
+    if created.returncode != 0:
+        raise RuntimeError("failed to create sandbox")
 
-    ps = Popen(["hc", "sandbox", "--piped", "run"], stdin=PIPE, stdout=PIPE, text=True)
-    ps.stdin.write("passphrase\n")
-    ps.stdin.flush()
+    process = subprocess.Popen(
+        ["hc", "sandbox", "--piped", "run"],
+        stdin=subprocess.PIPE,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+        text=True,
+    )
+    assert process.stdin is not None and process.stdout is not None
+    process.stdin.write(PASSPHRASE)
+    process.stdin.flush()
 
-    # TODO if the sandbox fails to start or print the expected magic line, this loop won't exit
-    admin_port = 0
     while True:
-        line = ps.stdout.readline()
+        line = process.stdout.readline()
+        if line == "":
+            raise RuntimeError("conductor exited before reporting its admin port")
         match = re.search(r"#!0 (.*)", line)
         if match:
-            info = json.loads(match.group(1))
-            admin_port = info["admin_port"]
-            break
-
-    return (ps, admin_port)
+            return process, json.loads(match.group(1))["admin_port"]
diff --git a/tests/test_record.py b/tests/test_record.py
new file mode 100644
index 0000000..1a219f2
--- /dev/null
+++ b/tests/test_record.py
@@ -0,0 +1,80 @@
+"""Unit tests for Record/Action/Entry decoding (no conductor required)."""
+
+import msgpack
+
+from holochain_client.hash import (
+    ACTION_PREFIX,
+    AGENT_PREFIX,
+    ENTRY_PREFIX,
+    ActionHash,
+    AgentPubKey,
+)
+from holochain_client.types.record import (
+    AppEntry,
+    Create,
+    EntryPresent,
+    EntryTypeApp,
+    decode_record,
+)
+
+
+def _hash(prefix):
+    return prefix + bytes(32) + bytes(4)
+
+
+def _create_record():
+    action_hash = _hash(ACTION_PREFIX)
+    return {
+        "signed_action": {
+            "hashed": {
+                "hash": action_hash,
+                "content": {
+                    "type": "Create",
+                    "author": _hash(AGENT_PREFIX),
+                    "timestamp": 1700000000000000,
+                    "action_seq": 5,
+                    "prev_action": action_hash,
+                    "entry_type": {
+                        "App": {
+                            "entry_index": 0,
+                            "zome_index": 1,
+                            "visibility": "Public",
+                        }
+                    },
+                    "entry_hash": _hash(ENTRY_PREFIX),
+                    "weight": {"bucket_id": 0, "units": 0},
+                },
+            },
+            "signature": bytes(64),
+        },
+        "entry": {
+            "Present": {
+                "entry_type": "App",
+                "entry": msgpack.packb({"value": "first"}, use_bin_type=True),
+            }
+        },
+    }
+
+
+def test_decode_record_action_is_typed():
+    record = decode_record(_create_record())
+    action = record.action()
+    assert isinstance(action, Create)
+    assert isinstance(action.author, AgentPubKey)
+    assert action.action_seq == 5
+    assert isinstance(record.action_hash(), ActionHash)
+
+
+def test_decode_record_internal_external_adjacent_tagging():
+    record = decode_record(_create_record())
+    # internal-tagged Action -> external-tagged EntryType -> nested struct.
+    assert isinstance(record.action().entry_type, EntryTypeApp)
+    assert record.action().entry_type.app_entry_def.zome_index == 1
+
+
+def test_decode_record_entry_roundtrips():
+    record = decode_record(_create_record())
+    assert isinstance(record.entry, EntryPresent)
+    entry = record.entry_value()
+    assert isinstance(entry, AppEntry)
+    assert msgpack.unpackb(entry.bytes, raw=False) == {"value": "first"}
diff --git a/tests/test_serde.py b/tests/test_serde.py
new file mode 100644
index 0000000..c10245c
--- /dev/null
+++ b/tests/test_serde.py
@@ -0,0 +1,79 @@
+"""Unit tests for the serde layer and hashes (no conductor required)."""
+
+from holochain_client.hash import (
+    AGENT_PREFIX,
+    DNA_PREFIX,
+    AgentPubKey,
+    DnaHash,
+    hash_from_raw,
+)
+from holochain_client.serde import decode, encode
+from holochain_client.types.app import AppDisabled, AppStatus, DisabledByError
+from holochain_client.types.capability import (
+    CapAccessAssigned,
+    GrantedFunctionsAll,
+    GrantedFunctionsListed,
+)
+from holochain_client.types.cell import CellId, CellInfo, ProvisionedCell
+
+
+def _dna() -> DnaHash:
+    return DnaHash(DNA_PREFIX + bytes(32) + bytes(4))
+
+
+def _agent() -> AgentPubKey:
+    return AgentPubKey(AGENT_PREFIX + bytes(32) + bytes(4))
+
+
+def test_holohash_roundtrip_and_b64():
+    dna = _dna()
+    assert len(dna) == 39
+    assert dna.to_b64().startswith("uhC0k")
+    assert DnaHash.from_b64(dna.to_b64()) == dna
+    assert isinstance(hash_from_raw(bytes(dna)), DnaHash)
+
+
+def test_cell_id_serializes_as_pair():
+    cell_id = CellId(_dna(), _agent())
+    wire = encode(cell_id)
+    assert wire == [bytes(_dna()), bytes(_agent())]
+    assert decode(wire, CellId) == cell_id
+
+
+def test_cell_info_provisioned_decode():
+    wire = {
+        "type": "provisioned",
+        "value": {
+            "cell_id": [bytes(_dna()), bytes(_agent())],
+            "dna_modifiers": {"network_seed": "seed", "properties": None},
+            "name": "fixture",
+        },
+    }
+    info = CellInfo.__from_wire__(wire)
+    assert isinstance(info, ProvisionedCell)
+    assert info.name == "fixture"
+    assert info.cell_id == CellId(_dna(), _agent())
+
+
+def test_app_status_nested_union():
+    status = decode(
+        {"type": "disabled", "value": {"type": "error", "value": "boom"}}, AppStatus
+    )
+    assert isinstance(status, AppDisabled)
+    assert isinstance(status.reason, DisabledByError)
+    assert status.reason.message == "boom"
+
+
+def test_granted_functions_encode():
+    assert encode(GrantedFunctionsAll()) == {"type": "all"}
+    assert encode(GrantedFunctionsListed(functions=[["zome", "fn"]])) == {
+        "type": "listed",
+        "value": [["zome", "fn"]],
+    }
+
+
+def test_cap_access_assigned_encode():
+    wire = encode(CapAccessAssigned(secret=bytes(64), assignees=[_agent()]))
+    assert wire["type"] == "assigned"
+    assert wire["value"]["secret"] == bytes(64)
+    assert wire["value"]["assignees"] == [bytes(_agent())]
diff --git a/tests/test_signing.py b/tests/test_signing.py
new file mode 100644
index 0000000..dc9d955
--- /dev/null
+++ b/tests/test_signing.py
@@ -0,0 +1,48 @@
+"""Unit tests for zome-call signing (no conductor required)."""
+
+import hashlib
+
+import msgpack
+from nacl.signing import VerifyKey
+
+from holochain_client.hash import AGENT_PREFIX, DNA_PREFIX, AgentPubKey, DnaHash
+from holochain_client.signing import SigningKeyPair, sign_zome_call
+from holochain_client.types.cell import CellId
+
+
+def test_signing_key_agent_pub_key_layout():
+    keypair = SigningKeyPair()
+    agent = keypair.agent_pub_key
+    assert isinstance(agent, AgentPubKey)
+    assert len(agent) == 39
+    assert bytes(agent[:3]) == AGENT_PREFIX
+    assert bytes(agent[-4:]) == bytes(4)  # zeroed location
+
+
+def test_sign_zome_call_is_verifiable():
+    keypair = SigningKeyPair()
+    cell_id = CellId(
+        DnaHash(DNA_PREFIX + bytes(32) + bytes(4)),
+        keypair.agent_pub_key,
+    )
+    signed = sign_zome_call(
+        cell_id=cell_id,
+        zome_name="fixture",
+        fn_name="echo",
+        payload="hello",
+        provenance=keypair.agent_pub_key,
+        signing_key=keypair,
+        cap_secret=bytes(64),
+    )
+    # The signature is over the SHA-512 of the transmitted bytes.
+    expected_hash = hashlib.sha512(signed.bytes).digest()
+    verify_key = VerifyKey(bytes(keypair.agent_pub_key[3:35]))
+    verify_key.verify(expected_hash, signed.signature)
+
+    # The transmitted bytes deserialize back to the params, with a
+    # double-encoded payload.
+    params = msgpack.unpackb(signed.bytes, raw=False)
+    assert params["zome_name"] == "fixture"
+    assert params["fn_name"] == "echo"
+    assert msgpack.unpackb(params["payload"], raw=False) == "hello"
+    assert len(params["nonce"]) == 32