anchorregistry

Trustless Python client for the AnchorRegistry provenance chain on Base (Ethereum L2).

anchorregistry reads provenance records directly from the Base blockchain — no intermediary API, no account, no API key. It is the same library used in AnchorRegistry's own production backend.

Verify what existed, when, and who registered it — directly from the chain.

DAPX-Anchor: anchorregistry.ai/AR-2026-0000001

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Installation

pip install anchorregistry

# With DataFrame support
pip install anchorregistry[analytics]

Requires Python 3.11+

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Quickstart

from anchorregistry import get_by_arid

record = get_by_arid("AR-2026-Pvdp0W5")
print(record["title"])        # DeFiPy GitHub
print(record["author"])       # Ian Moore
print(record["manifest_hash"])
print(record["data"]["language"])  # Python

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Usage

Query by AR-ID

from anchorregistry import get_by_arid

record = get_by_arid("AR-2026-Pvdp0W5")

Query by registrant wallet

from anchorregistry import get_by_registrant

records = get_by_registrant("0xc7a7afde1177fbf0bb265ea5a616d1b8d7ed8c44")

Query by tree

from anchorregistry import get_by_tree

records = get_by_tree("ar-operator-v1")

Query by artifact type

from anchorregistry import get_by_type
from anchorregistry.enums import ArtifactType

records = get_by_type(ArtifactType.CODE)

Full registry harvest

from anchorregistry import get_all

records = get_all()                                          # full registry
records = get_all(from_block=10000000)                       # from block
records = get_all(from_block=10000000, to_block=10500000)    # block range

Verify file integrity

from anchorregistry import verify

result = verify("AR-2026-Pvdp0W5")                          # record only
result = verify("AR-2026-Pvdp0W5", file_path="./myfile.py") # + SHA256 check
print(result["hash_match"])  # True / False

Generate watermark tag

from anchorregistry import watermark

line = watermark("AR-2026-Pvdp0W5", artifact_type="CODE")
# → "SPDX-Anchor: anchorregistry.ai/AR-2026-Pvdp0W5"

line = watermark("AR-2026-Pvdp0W5", artifact_type="RESEARCH")
# → "DAPX-Anchor: anchorregistry.ai/AR-2026-Pvdp0W5"

# Resolves type from chain if not provided
line = watermark("AR-2026-Pvdp0W5")

Analytics — load into DataFrame

from anchorregistry import get_all, to_dataframe

df = to_dataframe(get_all())
df[df.artifact_type_name == "CODE"]
df[df.author == "Ian Moore"]
df.groupby("artifact_type_name").count()

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Network Configuration

Works identically against Base mainnet and Sepolia testnet.

from anchorregistry import configure

# Mainnet (default)
configure(network="base")

# Sepolia testnet
configure(network="sepolia")

# Custom RPC
configure(network="base", rpc_url="https://my-rpc-node.com")

Or via environment variables:

export NETWORK=sepolia
export BASE_RPC_URL=https://my-rpc-node.com
export ANCHOR_REGISTRY_ADDRESS=0x...

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Record Structure

Every record follows a consistent two-level structure regardless of artifact type:

{
    # Universal fields — identical for every type
    "ar_id":                "AR-2026-Pvdp0W5",
    "registered":           True,
    "artifact_type_index":  0,
    "artifact_type_name":   "CODE",
    "tx":                   "0xe36116...",
    "block":                10533679,
    "registrant":           "0xc7a7af...",
    "manifest_hash":        "3e2d69...",
    "parent_ar_id":         "",
    "descriptor":           "DeFiPy: Python SDK for DeFi Analytics and Agents",
    "title":                "DeFiPy GitHub",
    "author":               "Ian Moore",
    "tree_id":              "ar-operator-v1",

    # Type-specific fields — only fields for this artifact type
    "data": {
        "git_hash":  "18afe3d...",
        "license":   "MIT",
        "language":  "Python",
        "version":   "v1.0.0",
        "url":       "https://github.com/defipy-devs/defipy"
    }
}

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Watermark Standards

AnchorRegistry defines two watermark standards for embedding a provenance signal in any artifact:

SPDX-Anchor — for software (code, packages, repositories)

SPDX-Anchor: anchorregistry.ai/AR-2026-XXXXXXX

DAPX-Anchor — for all other artifacts (research, data, models, media, legal, proofs)

DAPX-Anchor: anchorregistry.ai/AR-2026-XXXXXXX

One line signals membership in a provenance tree — queryable by humans and AI agents alike.

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Exported Constants

from anchorregistry import ARTIFACT_TYPE_MAP, READ_ABI, CONTRACT_ADDRESS, DEPLOY_BLOCK

ARTIFACT_TYPE_MAP and READ_ABI are the canonical source of truth for AnchorRegistry type ordering and ABI — used by AnchorRegistry's production backend directly.

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Design

• Trustless. Reads directly from Base blockchain events via RPC. No AnchorRegistry servers involved.
• Read-only. Registration happens through anchorregistry.com. This package only reads.
• No auth required. Verification is open and free to anyone with an RPC endpoint.
• Production parity. The same library powering the AnchorRegistry backend — not a wrapper.
• Network-agnostic. Works identically against Base mainnet and Sepolia testnet.
• Built on Base. Base settles to Ethereum mainnet — provenance anchors inherit Ethereum-grade finality.

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Testing

Unit tests (no RPC required)

python3 -m pytest tests/ -v --ignore=tests/test_client.py

Full suite with Sepolia integration tests

Create a .env file with your Sepolia RPC endpoint:

SEPOLIA_RPC_URL=https://sepolia.infura.io/v3/YOUR_KEY

Then run:

set -a && source .env && set +a && python3 -m pytest tests/ -v

Integration tests in test_client.py are automatically skipped when SEPOLIA_RPC_URL is not set.

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Status

Alpha. Core library under active development against Sepolia testnet. API surface stable per spec. Not yet published to PyPI.

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License

Business Source License 1.1 (BUSL-1.1)
Change Date: March 12, 2028 → Apache License 2.0
Licensor: Ian Moore

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Links

• Website: anchorregistry.com
• Verify: anchorregistry.ai
• Docs: anchorregistry.readthedocs.io
• PyPI: pypi.org/project/anchorregistry
• Source: github.com/anchorregistry/ar-python