diff --git a/Cargo.lock b/Cargo.lock
index 6fb0ee1..1f532e1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,23 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "adler2"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
+
+[[package]]
+name = "aes"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b169f7a6d4742236a0a00c541b845991d0ac43e546831af1249753ab4c3aa3a0"
+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.4"
@@ -19,9 +36,9 @@ checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
 [[package]]
 name = "anstream"
-version = "0.6.21"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43d5b281e737544384e969a5ccad3f1cdd24b48086a0fc1b2a5262a26b8f4f4a"
+checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -34,15 +51,15 @@ dependencies = [
 
 [[package]]
 name = "anstyle"
-version = "1.0.13"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5192cca8006f1fd4f7237516f40fa183bb07f8fbdfedaa0036de5ea9b0b45e78"
+checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"
 
 [[package]]
 name = "anstyle-parse"
-version = "0.2.7"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2"
+checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e"
 dependencies = [
  "utf8parse",
 ]
@@ -88,6 +105,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
 
+[[package]]
+name = "atomic-waker"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -116,6 +139,12 @@ version = "0.21.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
 
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "bech32"
 version = "0.11.1"
@@ -230,7 +259,7 @@ dependencies = [
  "bitcoincore-rpc",
  "log",
  "tempfile",
- "which",
+ "which 4.4.2",
 ]
 
 [[package]]
@@ -285,13 +314,30 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "bytes"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
+
+[[package]]
+name = "bzip2"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a53fac24f34a81bc9954b5d6cfce0c21e18ec6959f44f56e8e90e4bb7c346c"
+dependencies = [
+ "libbz2-rs-sys",
+]
+
 [[package]]
 name = "cc"
-version = "1.2.56"
+version = "1.2.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aebf35691d1bfb0ac386a69bac2fde4dd276fb618cf8bf4f5318fe285e821bb2"
+checksum = "43c5703da9466b66a946814e1adf53ea2c90f10063b86290cc9eb67ce3478a20"
 dependencies = [
  "find-msvc-tools",
+ "jobserver",
+ "libc",
  "shlex",
 ]
 
@@ -321,11 +367,21 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "cipher"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773f3b9af64447d2ce9850330c473515014aa235e6a783b02db81ff39e4a3dad"
+dependencies = [
+ "crypto-common",
+ "inout",
+]
+
 [[package]]
 name = "clap"
-version = "4.5.60"
+version = "4.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2797f34da339ce31042b27d23607e051786132987f595b02ba4f6a6dffb7030a"
+checksum = "b193af5b67834b676abd72466a96c1024e6a6ad978a1f484bd90b85c94041351"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -333,9 +389,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.60"
+version = "4.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24a241312cea5059b13574bb9b3861cabf758b879c15190b37b6d6fd63ab6876"
+checksum = "714a53001bf66416adb0e2ef5ac857140e7dc3a0c48fb28b2f10762fc4b5069f"
 dependencies = [
  "anstream",
  "anstyle",
@@ -345,9 +401,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.55"
+version = "4.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a92793da1a46a5f2a02a6f4c46c6496b28c43638adea8306fcb0caa1634f24e5"
+checksum = "1110bd8a634a1ab8cb04345d8d878267d57c3cf1b38d91b71af6686408bbca6a"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -357,15 +413,47 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "1.0.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a822ea5bc7590f9d40f1ba12c0dc3c2760f3482c6984db1573ad11031420831"
+checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
 
 [[package]]
 name = "colorchoice"
-version = "1.0.4"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
+
+[[package]]
+name = "constant_time_eq"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d52eff69cd5e647efe296129160853a42795992097e8af39800e1060caeea9b"
+
+[[package]]
+name = "core-foundation"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91e195e091a93c46f7102ec7818a2aa394e1e1771c3ab4825963fa03e45afb8f"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2a6cd9ae233e7f62ba4e9353e81a88df7fc8a5987b8d445b4d90c879bd156f6"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
 [[package]]
 name = "cpufeatures"
@@ -376,6 +464,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crossbeam-deque"
 version = "0.8.6"
@@ -422,6 +519,21 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "deflate64"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac6b926516df9c60bfa16e107b21086399f8285a44ca9711344b9e553c5146e2"
+
+[[package]]
+name = "deranged"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"
+dependencies = [
+ "powerfmt",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -430,6 +542,7 @@ checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
+ "subtle",
 ]
 
 [[package]]
@@ -444,6 +557,17 @@ dependencies = [
  "objc2",
 ]
 
+[[package]]
+name = "displaydoc"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "dotenvy"
 version = "0.15.7"
@@ -475,7 +599,7 @@ dependencies = [
  "electrum-client",
  "log",
  "nix 0.25.1",
- "which",
+ "which 4.4.2",
 ]
 
 [[package]]
@@ -515,6 +639,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75030f3c4f45dafd7586dd6780965a8c7e8e285a5ecb86713e63a79c5b2766f3"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -533,9 +666,20 @@ dependencies = [
 
 [[package]]
 name = "fastrand"
-version = "2.3.0"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f1f227452a390804cdb637b74a86990f2a7d7ba4b7d5693aac9b4dd6defd8d6"
+
+[[package]]
+name = "filetime"
+version = "0.2.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
+checksum = "f98844151eee8917efc50bd9e8318cb963ae8b297431495d3f758616ea5c57db"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "libredox",
+]
 
 [[package]]
 name = "find-msvc-tools"
@@ -543,12 +687,113 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
+[[package]]
+name = "flate2"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843fba2746e448b37e26a819579957415c8cef339bf08564fe8b7ddbd959573c"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+ "zlib-rs",
+]
+
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
+[[package]]
+name = "foreign-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
+dependencies = [
+ "foreign-types-shared",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb4cb245038516f5f85277875cdaa4f7d2c9a0fa0468de06ed190163b1581fcf"
+dependencies = [
+ "percent-encoding",
+]
+
+[[package]]
+name = "fs3"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb17cf6ed704f72485332f6ab65257460c4f9f3083934cf402bf9f5b3b600a90"
+dependencies = [
+ "libc",
+ "rustc_version",
+ "winapi",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07bbe89c50d7a535e539b8c17bc0b49bdb77747034daa8087407d655f3f7cc1d"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e3450815272ef58cec6d564423f6e755e25379b217b0bc688e295ba24df6b1d"
+
+[[package]]
+name = "futures-io"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cecba35d7ad927e23624b22ad55235f2239cfa44fd10428eecbeba6d6a717718"
+
+[[package]]
+name = "futures-sink"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c39754e157331b013978ec91992bde1ac089843443c49cbc7f46150b0fad0893"
+
+[[package]]
+name = "futures-task"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "037711b3d59c33004d3856fbdc83b99d4ff37a24768fa1be9ce3538a1cde4393"
+
+[[package]]
+name = "futures-util"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "389ca41296e6190b48053de0321d02a77f32f8a5d2461dd38762c0593805c6d6"
+dependencies = [
+ "futures-core",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "memchr",
+ "pin-project-lite",
+ "slab",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -572,6 +817,18 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi 5.3.0",
+ "wasip2",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.4.2"
@@ -579,10 +836,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
- "r-efi",
+ "r-efi 6.0.0",
  "wasip2",
  "wasip3",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -621,6 +880,25 @@ dependencies = [
  "walkdir",
 ]
 
+[[package]]
+name = "h2"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f44da3a8150a6703ed5d34e164b875fd14c2cdab9af1252a9a1020bde2bdc54"
+dependencies = [
+ "atomic-waker",
+ "bytes",
+ "fnv",
+ "futures-core",
+ "futures-sink",
+ "http",
+ "indexmap",
+ "slab",
+ "tokio",
+ "tokio-util",
+ "tracing",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
@@ -634,9 +912,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.16.1"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+checksum = "4f467dd6dccf739c208452f8014c75c18bb8301b050ad1cfb27153803edb0f51"
 
 [[package]]
 name = "heck"
@@ -665,6 +943,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3011d1213f159867b13cfd6ac92d2cd5f1345762c63be3554e84092d85a50bbd"
 
+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "home"
 version = "0.5.12"
@@ -675,150 +962,483 @@ dependencies = [
 ]
 
 [[package]]
-name = "id-arena"
-version = "2.3.0"
+name = "http"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
+checksum = "e3ba2a386d7f85a81f119ad7498ebe444d2e22c2af0b86b069416ace48b3311a"
+dependencies = [
+ "bytes",
+ "itoa",
+]
 
 [[package]]
-name = "ignore"
-version = "0.4.25"
+name = "http-body"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3d782a365a015e0f5c04902246139249abf769125006fbe7649e2ee88169b4a"
+checksum = "1efedce1fb8e6913f23e0c92de8e62cd5b772a67e7b3946df930a62566c93184"
 dependencies = [
- "crossbeam-deque",
- "globset",
- "log",
- "memchr",
- "regex-automata 0.4.14",
- "same-file",
- "walkdir",
- "winapi-util",
+ "bytes",
+ "http",
 ]
 
 [[package]]
-name = "indexmap"
-version = "2.13.0"
+name = "http-body-util"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
+checksum = "b021d93e26becf5dc7e1b75b1bed1fd93124b374ceb73f43d4d4eafec896a64a"
 dependencies = [
- "equivalent",
- "hashbrown 0.16.1",
- "serde",
- "serde_core",
+ "bytes",
+ "futures-core",
+ "http",
+ "http-body",
+ "pin-project-lite",
 ]
 
 [[package]]
-name = "is_terminal_polyfill"
-version = "1.70.2"
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+checksum = "19f132c84eca552bf34cab8ec81f1c1dcc229b811638f9d283dceabe58c5569e"
+
+[[package]]
+name = "plain"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
+
+[[package]]
+name = "potential_utf"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0103b1cef7ec0cf76490e969665504990193874ea05c85ff9bab8b911d0a0564"
+dependencies = [
+ "zerovec",
+]
+
+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
+[[package]]
+name = "ppmd-rust"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "efca4c95a19a79d1c98f791f10aebd5c1363b473244630bb7dbde1dc98455a24"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.21"
@@ -946,6 +1665,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "r-efi"
+version = "5.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
+
 [[package]]
 name = "r-efi"
 version = "6.0.0"
@@ -982,6 +1707,15 @@ dependencies = [
  "getrandom 0.2.17",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f450ad9c3b1da563fb6948a8e0fb0fb9269711c9c73d9ea1de5058c79c8d643a"
+dependencies = [
+ "bitflags 2.11.0",
+]
+
 [[package]]
 name = "regex"
 version = "1.12.3"
@@ -1028,6 +1762,48 @@ version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"
 
+[[package]]
+name = "reqwest"
+version = "0.12.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eddd3ca559203180a307f12d114c268abf583f59b03cb906fd0b3ff8646c1147"
+dependencies = [
+ "base64 0.22.1",
+ "bytes",
+ "encoding_rs",
+ "futures-channel",
+ "futures-core",
+ "futures-util",
+ "h2",
+ "http",
+ "http-body",
+ "http-body-util",
+ "hyper",
+ "hyper-rustls",
+ "hyper-tls",
+ "hyper-util",
+ "js-sys",
+ "log",
+ "mime",
+ "native-tls",
+ "percent-encoding",
+ "pin-project-lite",
+ "rustls-pki-types",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "sync_wrapper",
+ "tokio",
+ "tokio-native-tls",
+ "tower",
+ "tower-http",
+ "tower-service",
+ "url",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
 [[package]]
 name = "ring"
 version = "0.17.14"
@@ -1042,6 +1818,15 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
+dependencies = [
+ "semver 0.9.0",
+]
+
 [[package]]
 name = "rustix"
 version = "0.38.44"
@@ -1076,10 +1861,32 @@ checksum = "3f56a14d1f48b391359b22f731fd4bd7e43c97f3c50eee276f3aa09c94784d3e"
 dependencies = [
  "log",
  "ring",
- "rustls-webpki",
+ "rustls-webpki 0.101.7",
  "sct",
 ]
 
+[[package]]
+name = "rustls"
+version = "0.23.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69f9466fb2c14ea04357e91413efb882e2a6d4a406e625449bc0a5d360d53a21"
+dependencies = [
+ "once_cell",
+ "rustls-pki-types",
+ "rustls-webpki 0.103.12",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "rustls-pki-types"
+version = "1.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be040f8b0a225e40375822a563fa9524378b9d63112f53e19ffff34df5d33fdd"
+dependencies = [
+ "zeroize",
+]
+
 [[package]]
 name = "rustls-webpki"
 version = "0.101.7"
@@ -1090,12 +1897,29 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "rustls-webpki"
+version = "0.103.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8279bb85272c9f10811ae6a6c547ff594d6a7f3c6c6b02ee9726d1d0dcfcdd06"
+dependencies = [
+ "ring",
+ "rustls-pki-types",
+ "untrusted",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
+[[package]]
+name = "ryu"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
+
 [[package]]
 name = "same-file"
 version = "1.0.6"
@@ -1114,6 +1938,15 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "schannel"
+version = "0.1.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91c1b7e4904c873ef0710c1f407dde2e6287de2bebc1bbbf7d430bb7cbffd939"
+dependencies = [
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "sct"
 version = "0.7.1"
@@ -1168,11 +2001,49 @@ dependencies = [
  "secp256k1-sys",
 ]
 
+[[package]]
+name = "security-framework"
+version = "3.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7f4bc775c73d9a02cde8bf7b2ec4c9d12743edf609006c7facc23998404cd1d"
+dependencies = [
+ "bitflags 2.11.0",
+ "core-foundation 0.10.1",
+ "core-foundation-sys",
+ "libc",
+ "security-framework-sys",
+]
+
+[[package]]
+name = "security-framework-sys"
+version = "2.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ce2691df843ecc5d231c0b14ece2acc3efb62c0a398c7e1d875f3983ce020e3"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
 [[package]]
 name = "semver"
-version = "1.0.27"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d767eb0aabc880b29956c35734170f26ed551a859dbd361d140cdbeca61ab1e2"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+dependencies = [
+ "semver-parser",
+]
+
+[[package]]
+name = "semver"
+version = "1.0.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a7852d02fc848982e0c167ef163aaff9cd91dc640ba85e263cb1ce46fae51cd"
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
 [[package]]
 name = "serde"
@@ -1219,13 +2090,36 @@ dependencies = [
 
 [[package]]
 name = "serde_spanned"
-version = "1.0.4"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8bbf91e5a4d6315eee45e704372590b30e260ee83af6639d64557f51b067776"
+checksum = "6662b5879511e06e8999a8a235d848113e942c9124f211511b16466ee2995f26"
 dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "serde_urlencoded"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3491c14715ca2294c4d6a88f15e84739788c1d030eed8c110436aafdaa2f3fd"
+dependencies = [
+ "form_urlencoded",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "sha1"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "sha2"
 version = "0.10.9"
@@ -1243,6 +2137,12 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
+[[package]]
+name = "simd-adler32"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "703d5c7ef118737c72f1af64ad2f6f8c5e1921f818cdcb97b8fe6fc69bf66214"
+
 [[package]]
 name = "simplicity-lang"
 version = "0.7.0"
@@ -1288,21 +2188,41 @@ dependencies = [
  "simplicity-lang",
 ]
 
+[[package]]
+name = "slab"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c790de23124f9ab44544d7ac05d60440adc586479ce501c1d6d7da3cd8c9cf5"
+
+[[package]]
+name = "smallvec"
+version = "1.15.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
+
 [[package]]
 name = "smplx-build"
 version = "0.0.3"
 dependencies = [
+ "flate2",
+ "fs3",
  "glob",
  "globwalk",
+ "home",
  "pathdiff",
  "prettyplease",
  "proc-macro2",
  "quote",
+ "reqwest",
+ "semver 1.0.28",
  "serde",
  "simplicityhl",
  "syn",
+ "tar",
  "thiserror",
  "toml 0.9.12+spec-1.1.0",
+ "which 6.0.3",
+ "zip",
 ]
 
 [[package]]
@@ -1393,6 +2313,22 @@ dependencies = [
  "toml 0.9.12+spec-1.1.0",
 ]
 
+[[package]]
+name = "socket2"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
+dependencies = [
+ "libc",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "stable_deref_trait"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
+
 [[package]]
 name = "stacker"
 version = "0.1.23"
@@ -1412,6 +2348,12 @@ version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
+[[package]]
+name = "subtle"
+version = "2.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
+
 [[package]]
 name = "syn"
 version = "2.0.117"
@@ -1423,6 +2365,58 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "sync_wrapper"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bf256ce5efdfa370213c1dabab5935a12e49f2c58d15e9eac2870d3b4f27263"
+dependencies = [
+ "futures-core",
+]
+
+[[package]]
+name = "synstructure"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "system-configuration"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a13f3d0daba03132c0aa9767f98351b3488edc2c100cda2d2ec2b04f3d8d3c8b"
+dependencies = [
+ "bitflags 2.11.0",
+ "core-foundation 0.9.4",
+ "system-configuration-sys",
+]
+
+[[package]]
+name = "system-configuration-sys"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e1d1b10ced5ca923a1fcb8d03e96b8d3268065d724548c0211415ff6ac6bac4"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "tar"
+version = "0.4.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22692a6476a21fa75fdfc11d452fda482af402c008cdbaf3476414e122040973"
+dependencies = [
+ "filetime",
+ "libc",
+ "xattr",
+]
+
 [[package]]
 name = "target-triple"
 version = "1.0.0"
@@ -1431,9 +2425,9 @@ checksum = "591ef38edfb78ca4771ee32cf494cb8771944bee237a9b91fc9c1424ac4b777b"
 
 [[package]]
 name = "tempfile"
-version = "3.26.0"
+version = "3.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82a72c767771b47409d2345987fda8628641887d5466101319899796367354a0"
+checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
  "fastrand",
  "getrandom 0.4.2",
@@ -1471,11 +2465,41 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.47"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "743bd48c283afc0388f9b8827b976905fb217ad9e647fae3a379a9283c4def2c"
+dependencies = [
+ "deranged",
+ "js-sys",
+ "num-conv",
+ "powerfmt",
+ "serde_core",
+ "time-core",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7694e1cfe791f8d31026952abf09c69ca6f6fa4e1a1229e18988f06a04a12dca"
+
+[[package]]
+name = "tinystr"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8323304221c2a851516f22236c5722a72eaa19749016521d6dff0824447d96d"
+dependencies = [
+ "displaydoc",
+ "zerovec",
+]
+
 [[package]]
 name = "tinyvec"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa5fdc3bce6191a1dbc8c02d5c8bffcf557bafa17c124c5264a458f1b0613fa"
+checksum = "3e61e67053d25a4e82c844e8424039d9745781b3fc4f32b8d55ed50f5f667ef3"
 dependencies = [
  "tinyvec_macros",
 ]
@@ -1488,25 +2512,63 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.50.0"
+version = "1.51.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27ad5e34374e03cfffefc301becb44e9dc3c17584f414349ebe29ed26661822d"
+checksum = "f66bf9585cda4b724d3e78ab34b73fb2bbaba9011b9bfdf69dc836382ea13b8c"
 dependencies = [
+ "bytes",
+ "libc",
+ "mio",
  "pin-project-lite",
+ "socket2",
  "tokio-macros",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
 name = "tokio-macros"
-version = "2.6.1"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c55a2eff8b69ce66c84f85e1da1c233edc36ceb85a2058d11b0d6a3c7e7569c"
+checksum = "385a6cb71ab9ab790c5fe8d67f1645e6c450a7ce006a33de03daa956cf70a496"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "tokio-native-tls"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbae76ab933c85776efabc971569dd6119c580d8f5d448769dec1764bf796ef2"
+dependencies = [
+ "native-tls",
+ "tokio",
+]
+
+[[package]]
+name = "tokio-rustls"
+version = "0.26.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1729aa945f29d91ba541258c8df89027d5792d85a8841fb65e8bf0f4ede4ef61"
+dependencies = [
+ "rustls 0.23.38",
+ "tokio",
+]
+
+[[package]]
+name = "tokio-util"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ae9cec805b01e8fc3fd2fe289f89149a9b66dd16786abd8b19cfa7b48cb0098"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "toml"
 version = "0.9.12+spec-1.1.0"
@@ -1519,22 +2581,22 @@ dependencies = [
  "toml_datetime 0.7.5+spec-1.1.0",
  "toml_parser",
  "toml_writer",
- "winnow",
+ "winnow 0.7.15",
 ]
 
 [[package]]
 name = "toml"
-version = "1.0.4+spec-1.1.0"
+version = "1.1.2+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c94c3321114413476740df133f0d8862c61d87c8d26f04c6841e033c8c80db47"
+checksum = "81f3d15e84cbcd896376e6730314d59fb5a87f31e4b038454184435cd57defee"
 dependencies = [
  "indexmap",
  "serde_core",
  "serde_spanned",
- "toml_datetime 1.0.0+spec-1.1.0",
+ "toml_datetime 1.1.1+spec-1.1.0",
  "toml_parser",
  "toml_writer",
- "winnow",
+ "winnow 1.0.1",
 ]
 
 [[package]]
@@ -1548,9 +2610,9 @@ dependencies = [
 
 [[package]]
 name = "toml_datetime"
-version = "1.0.0+spec-1.1.0"
+version = "1.1.1+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32c2555c699578a4f59f0cc68e5116c8d7cabbd45e1409b989d4be085b53f13e"
+checksum = "3165f65f62e28e0115a00b2ebdd37eb6f3b641855f9d636d3cd4103767159ad7"
 dependencies = [
  "serde_core",
 ]
@@ -1565,23 +2627,93 @@ dependencies = [
  "toml_datetime 0.7.5+spec-1.1.0",
  "toml_parser",
  "toml_writer",
- "winnow",
+ "winnow 0.7.15",
 ]
 
 [[package]]
 name = "toml_parser"
-version = "1.0.9+spec-1.1.0"
+version = "1.1.2+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "702d4415e08923e7e1ef96cd5727c0dfed80b4d2fa25db9647fe5eb6f7c5a4c4"
+checksum = "a2abe9b86193656635d2411dc43050282ca48aa31c2451210f4202550afb7526"
 dependencies = [
- "winnow",
+ "winnow 1.0.1",
 ]
 
 [[package]]
 name = "toml_writer"
-version = "1.0.6+spec-1.1.0"
+version = "1.1.1+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "756daf9b1013ebe47a8776667b466417e2d4c5679d441c26230efd9ef78692db"
+
+[[package]]
+name = "tower"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebe5ef63511595f1344e2d5cfa636d973292adc0eec1f0ad45fae9f0851ab1d4"
+dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project-lite",
+ "sync_wrapper",
+ "tokio",
+ "tower-layer",
+ "tower-service",
+]
+
+[[package]]
+name = "tower-http"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4e6559d53cc268e5031cd8429d05415bc4cb4aefc4aa5d6cc35fbf5b924a1f8"
+dependencies = [
+ "bitflags 2.11.0",
+ "bytes",
+ "futures-util",
+ "http",
+ "http-body",
+ "iri-string",
+ "pin-project-lite",
+ "tower",
+ "tower-layer",
+ "tower-service",
+]
+
+[[package]]
+name = "tower-layer"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
+
+[[package]]
+name = "tower-service"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8df9b6e13f2d32c91b9bd719c00d1958837bc7dec474d94952798cc8e69eeec3"
+
+[[package]]
+name = "tracing"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63e71662fa4b2a2c3a26f570f037eb95bb1f85397f3cd8076caed2f026a6d100"
+dependencies = [
+ "pin-project-lite",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db97caf9d906fbde555dd62fa95ddba9eecfd14cb388e4f491a66d74cd5fb79a"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "try-lock"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab16f14aed21ee8bfd8ec22513f7287cd4a91aa92e44edfe2c17ddd004e92607"
+checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
 [[package]]
 name = "trybuild"
@@ -1595,9 +2727,15 @@ dependencies = [
  "serde_json",
  "target-triple",
  "termcolor",
- "toml 1.0.4+spec-1.1.0",
+ "toml 1.1.2+spec-1.1.0",
 ]
 
+[[package]]
+name = "typed-path"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e28f89b80c87b8fb0cf04ab448d5dd0dd0ade2f8891bae878de66a75a28600e"
+
 [[package]]
 name = "typenum"
 version = "1.19.0"
@@ -1621,9 +2759,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-segmentation"
-version = "1.12.0"
+version = "1.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6ccf251212114b54433ec949fd6a7841275f9ada20dddd2f29e9ceea4501493"
+checksum = "9629274872b2bfaf8d66f5f15725007f635594914870f65218920345aa11aa8c"
 
 [[package]]
 name = "unicode-xid"
@@ -1637,12 +2775,36 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
+[[package]]
+name = "url"
+version = "2.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff67a8a4397373c3ef660812acab3268222035010ab8680ec4215f38ba3d0eed"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+ "serde",
+]
+
+[[package]]
+name = "utf8_iter"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
+
 [[package]]
 name = "utf8parse"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "vcpkg"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
+
 [[package]]
 name = "version_check"
 version = "0.9.5"
@@ -1659,6 +2821,15 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "want"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa7760aed19e106de2c7c0b581b509f2f25d3dacaf737cb82ac61bc6d760b0e"
+dependencies = [
+ "try-lock",
+]
+
 [[package]]
 name = "wasi"
 version = "0.11.1+wasi-snapshot-preview1"
@@ -1685,9 +2856,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.114"
+version = "0.2.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6532f9a5c1ece3798cb1c2cfdba640b9b3ba884f5db45973a6f442510a87d38e"
+checksum = "0bf938a0bacb0469e83c1e148908bd7d5a6010354cf4fb73279b7447422e3a89"
 dependencies = [
  "cfg-if",
  "once_cell",
@@ -1696,11 +2867,21 @@ dependencies = [
  "wasm-bindgen-shared",
 ]
 
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f371d383f2fb139252e0bfac3b81b265689bf45b6874af544ffa4c975ac1ebf8"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.114"
+version = "0.2.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18a2d50fcf105fb33bb15f00e7a77b772945a2ee45dcf454961fd843e74c18e6"
+checksum = "eeff24f84126c0ec2db7a449f0c2ec963c6a49efe0698c4242929da037ca28ed"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -1708,9 +2889,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.114"
+version = "0.2.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03ce4caeaac547cdf713d280eda22a730824dd11e6b8c3ca9e42247b25c631e3"
+checksum = "9d08065faf983b2b80a79fd87d8254c409281cf7de75fc4b773019824196c904"
 dependencies = [
  "bumpalo",
  "proc-macro2",
@@ -1721,9 +2902,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.114"
+version = "0.2.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75a326b8c223ee17883a4251907455a2431acc2791c98c26279376490c378c16"
+checksum = "5fd04d9e306f1907bd13c6361b5c6bfc7b3b3c095ed3f8a9246390f8dbdee129"
 dependencies = [
  "unicode-ident",
 ]
@@ -1759,7 +2940,17 @@ dependencies = [
  "bitflags 2.11.0",
  "hashbrown 0.15.5",
  "indexmap",
- "semver",
+ "semver 1.0.28",
+]
+
+[[package]]
+name = "web-sys"
+version = "0.3.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f2dfbb17949fa2088e5d39408c48368947b86f7834484e87b73de55bc14d97d"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -1780,6 +2971,34 @@ dependencies = [
  "rustix 0.38.44",
 ]
 
+[[package]]
+name = "which"
+version = "6.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4ee928febd44d98f2f459a4a79bd4d928591333a494a10a868418ac1b39cf1f"
+dependencies = [
+ "either",
+ "home",
+ "rustix 0.38.44",
+ "winsafe",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
 [[package]]
 name = "winapi-util"
 version = "0.1.11"
@@ -1789,12 +3008,47 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
+[[package]]
+name = "windows-registry"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02752bf7fbdcce7f2a27a742f798510f3e5ad88dbe84871e5168e2120c3d5720"
+dependencies = [
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -1895,6 +3149,18 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winnow"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09dac053f1cd375980747450bfc7250c264eaae0583872e845c0c7cd578872b5"
+
+[[package]]
+name = "winsafe"
+version = "0.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d135d17ab770252ad95e9a872d365cf3090e3be864a34ab46f48555993efc904"
+
 [[package]]
 name = "wit-bindgen"
 version = "0.51.0"
@@ -1975,7 +3241,7 @@ dependencies = [
  "id-arena",
  "indexmap",
  "log",
- "semver",
+ "semver 1.0.28",
  "serde",
  "serde_derive",
  "serde_json",
@@ -1983,28 +3249,200 @@ dependencies = [
  "wasmparser",
 ]
 
+[[package]]
+name = "writeable"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
+
+[[package]]
+name = "xattr"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32e45ad4206f6d2479085147f02bc2ef834ac85886624a23575ae137c8aa8156"
+dependencies = [
+ "libc",
+ "rustix 1.1.4",
+]
+
+[[package]]
+name = "yoke"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abe8c5fda708d9ca3df187cae8bfb9ceda00dd96231bed36e445a1a48e66f9ca"
+dependencies = [
+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke-derive"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de844c262c8848816172cef550288e7dc6c7b7814b4ee56b3e1553f275f1858e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
 [[package]]
 name = "zerocopy"
-version = "0.8.40"
+version = "0.8.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a789c6e490b576db9f7e6b6d661bcc9799f7c0ac8352f56ea20193b2681532e5"
+checksum = "eed437bf9d6692032087e337407a86f04cd8d6a16a37199ed57949d415bd68e9"
 dependencies = [
  "zerocopy-derive",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.8.40"
+version = "0.8.48"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70e3cd084b1788766f53af483dd21f93881ff30d7320490ec3ef7526d203bad4"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zerofrom"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69faa1f2a1ea75661980b013019ed6687ed0e83d069bc1114e2cc74c6c04c4df"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11532158c46691caf0f2593ea8358fed6bbf68a0315e80aae9bd41fbade684a1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97154e67e32c85465826e8bcc1c59429aaaf107c1e4a9e53c8d8ccd5eff88d0"
+
+[[package]]
+name = "zerotrie"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f9152d31db0792fa83f70fb2f83148effb5c1f5b8c7686c3459e361d9bc20bf"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.11.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90f911cbc359ab6af17377d242225f4d75119aec87ea711a880987b18cd7b239"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f65c489a7071a749c849713807783f70672b28094011623e200cb86dcb835953"
+checksum = "625dc425cab0dca6dc3c3319506e6593dcb08a9f387ea3b284dbd52a92c40555"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "zip"
+version = "8.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcab981e19633ebcf0b001ddd37dd802996098bc1864f90b7c5d970ce76c1d59"
+dependencies = [
+ "aes",
+ "bzip2",
+ "constant_time_eq",
+ "crc32fast",
+ "deflate64",
+ "flate2",
+ "getrandom 0.4.2",
+ "hmac",
+ "indexmap",
+ "lzma-rust2",
+ "memchr",
+ "pbkdf2",
+ "ppmd-rust",
+ "sha1",
+ "time",
+ "typed-path",
+ "zeroize",
+ "zopfli",
+ "zstd",
+]
+
+[[package]]
+name = "zlib-rs"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3be3d40e40a133f9c916ee3f9f4fa2d9d63435b5fbe1bfc6d9dae0aa0ada1513"
+
 [[package]]
 name = "zmij"
 version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
+
+[[package]]
+name = "zopfli"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f05cd8797d63865425ff89b5c4a48804f35ba0ce8d125800027ad6017d2b5249"
+dependencies = [
+ "bumpalo",
+ "crc32fast",
+ "log",
+ "simd-adler32",
+]
+
+[[package]]
+name = "zstd"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e91ee311a569c327171651566e07972200e76fcfe2242a4fa446149a3881c08a"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f49c4d5f0abb602a93fb8736af2a4f4dd9512e36f7f570d66e65ff867ed3b9d"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.16+zstd.1.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91e19ebc2adc8f83e43039e79776e3fda8ca919132d68a1fed6a5faca2683748"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/crates/build/Cargo.toml b/crates/build/Cargo.toml
index fdc82dd..11a3dfb 100644
--- a/crates/build/Cargo.toml
+++ b/crates/build/Cargo.toml
@@ -21,3 +21,11 @@ pathdiff = { version = "0.2.3" }
 prettyplease = { version = "0.2.37" }
 glob = { version = "0.3.3"}
 globwalk = { version = "0.9.1"}
+zip = "8.5.1"
+semver = "1.0"
+fs3 = "0.5"
+flate2 = "1.0"
+tar = "0.4"
+reqwest = { version = "0.12", features = ["blocking", "json"] }
+which = "6.0"
+home = "0.5"
diff --git a/crates/build/src/compiler/constants.rs b/crates/build/src/compiler/constants.rs
new file mode 100644
index 0000000..c52caab
--- /dev/null
+++ b/crates/build/src/compiler/constants.rs
@@ -0,0 +1,9 @@
+pub const REPO_OWNER: &str = "BlockstreamResearch";
+pub const REPO_NAME: &str = "SimplicityHL";
+pub const GITHUB_API_RELEASES_URL: &str = "https://api.github.com/repos/BlockstreamResearch/SimplicityHL/releases";
+pub const USER_AGENT: &str = "smplx-framework";
+pub const SMPLX_CACHE_DIR: &str = ".simplex";
+pub const COMPILERS_DIR_NAME: &str = "compilers";
+pub const DOWNLOAD_LOCK_FILE: &str = ".download.lock";
+pub const MIN_SUPPORTED_COMPILER_VERSION: &str = "0.3.0";
+pub const MAX_SUPPORTED_COMPILER_VERSION: &str = "0.4.1";
diff --git a/crates/build/src/compiler/downloader.rs b/crates/build/src/compiler/downloader.rs
new file mode 100644
index 0000000..58f57aa
--- /dev/null
+++ b/crates/build/src/compiler/downloader.rs
@@ -0,0 +1,250 @@
+use fs3::FileExt;
+use reqwest::blocking::Client;
+use semver::Version;
+use std::env;
+use std::fs::{self, File};
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+#[cfg(unix)]
+use std::os::unix::fs::PermissionsExt;
+
+use flate2::read::GzDecoder;
+use tar::Archive;
+use zip::ZipArchive;
+
+use super::constants;
+use crate::error::BuildError;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum PlatformBinary {
+    WindowsAmd,
+    LinuxAmd,
+    LinuxArm,
+    MacosAmd,
+    MacosArm,
+}
+
+impl PlatformBinary {
+    /// Detects the current platform based on OS and Architecture
+    pub fn current() -> Result<Self, BuildError> {
+        match (env::consts::OS, env::consts::ARCH) {
+            ("windows", "x86_64") => Ok(PlatformBinary::WindowsAmd),
+            ("linux", "x86_64") => Ok(PlatformBinary::LinuxAmd),
+            ("linux", "aarch64") => Ok(PlatformBinary::LinuxArm),
+            ("macos", "x86_64") => Ok(PlatformBinary::MacosAmd),
+            ("macos", "aarch64") => Ok(PlatformBinary::MacosArm),
+            (os, arch) => Err(BuildError::VersionResolution(format!(
+                "Unsupported OS/Arch combination: {}-{}",
+                os, arch
+            ))),
+        }
+    }
+
+    /// Returns the expected executable filename
+    pub fn filename(&self) -> &'static str {
+        if matches!(self, PlatformBinary::WindowsAmd) {
+            "simc.exe"
+        } else {
+            "simc"
+        }
+    }
+
+    /// Formats the GitHub Release asset name (e.g., "simc-macos-aarch64.tar.gz")
+    pub fn asset_name(&self) -> &'static str {
+        match self {
+            PlatformBinary::WindowsAmd => "simc-windows-x86_64.zip",
+            PlatformBinary::LinuxAmd => "simc-linux-x86_64.tar.gz",
+            PlatformBinary::LinuxArm => "simc-linux-aarch64.tar.gz",
+            PlatformBinary::MacosAmd => "simc-macos-x86_64.tar.gz",
+            PlatformBinary::MacosArm => "simc-macos-aarch64.tar.gz",
+        }
+    }
+}
+
+pub struct CompilerInfo {
+    pub binary_path: PathBuf,
+}
+
+pub struct CompilerDownloader {
+    platform: PlatformBinary,
+    compilers_dir: PathBuf,
+}
+
+impl CompilerDownloader {
+    pub fn new(compilers_dir: PathBuf) -> Self {
+        Self {
+            platform: PlatformBinary::current().expect("Unsupported platform"),
+            compilers_dir,
+        }
+    }
+
+    /// Checks if a compiler version is downloaded locally
+    pub fn is_compiler_downloaded(&self, version: &str) -> bool {
+        self.get_download_path(version).exists()
+    }
+
+    /// Retrieves the cached compiler binary path for execution
+    pub fn get_compiler_binary(&self, version: &str) -> Result<CompilerInfo, BuildError> {
+        let binary_path = self.get_download_path(version);
+        if !binary_path.exists() {
+            return Err(BuildError::VersionResolution(format!(
+                "Compiler binary for version {} not found in cache at {}",
+                version,
+                binary_path.display()
+            )));
+        }
+        Ok(CompilerInfo { binary_path })
+    }
+
+    /// Safely downloads the compiler using a multi-process lock
+    pub fn download_compiler(&self, version: &str, verify: bool) -> Result<(), BuildError> {
+        if self.is_compiler_downloaded(version) {
+            return Ok(());
+        }
+
+        fs::create_dir_all(&self.compilers_dir)?;
+        let lock_file_path = self.compilers_dir.join(constants::DOWNLOAD_LOCK_FILE);
+        let lock_file = File::create(&lock_file_path)?;
+
+        lock_file.lock_exclusive()?;
+
+        if self.is_compiler_downloaded(version) {
+            lock_file.unlock()?;
+            return Ok(());
+        }
+
+        println!("--> Downloading compiler v{}...", version);
+
+        let download_path = match self.perform_download(version) {
+            Ok(path) => path,
+            Err(e) => {
+                lock_file.unlock()?;
+                return Err(e);
+            }
+        };
+
+        #[allow(clippy::collapsible_if)]
+        if verify {
+            if let Err(e) = self.post_process_compiler(&download_path) {
+                let _ = fs::remove_file(&download_path);
+                lock_file.unlock()?;
+                return Err(e);
+            }
+        }
+
+        lock_file.unlock()?;
+        Ok(())
+    }
+
+    /// Returns a list of all compiler versions currently cached locally.
+    pub fn get_downloaded_versions(&self) -> Vec<String> {
+        let mut versions = Vec::new();
+
+        if let Ok(entries) = fs::read_dir(&self.compilers_dir) {
+            for entry in entries.flatten() {
+                if entry.path().is_dir() {
+                    let dir_name = entry.file_name().into_string().unwrap_or_default();
+
+                    let path = self.get_download_path(&dir_name);
+
+                    if let Some(ver) = Version::parse(&dir_name).ok().filter(|_| path.exists()) {
+                        versions.push(ver.to_string());
+                    }
+                }
+            }
+        }
+
+        versions
+    }
+
+    fn perform_download(&self, version: &str) -> Result<PathBuf, BuildError> {
+        let binary_path = self.get_download_path(version);
+        let cache_dir = binary_path.parent().unwrap();
+
+        fs::create_dir_all(cache_dir)?;
+
+        let asset = self.platform.asset_name();
+
+        let url = format!(
+            "https://github.com/{}/{}/releases/download/simplicityhl-{}/{}",
+            constants::REPO_OWNER,
+            constants::REPO_NAME,
+            version,
+            asset
+        );
+
+        let client = Client::builder()
+            .user_agent(constants::USER_AGENT)
+            .build()
+            .map_err(BuildError::Download)?;
+
+        let response = client.get(&url).send().map_err(BuildError::Download)?;
+
+        if !response.status().is_success() {
+            return Err(BuildError::VersionResolution(format!(
+                "Failed to download from GitHub. HTTP {}",
+                response.status()
+            )));
+        }
+
+        if asset.ends_with(".tar.gz") {
+            let tar = GzDecoder::new(response);
+            let mut archive = Archive::new(tar);
+            archive.unpack(cache_dir)?;
+        } else if asset.ends_with(".zip") {
+            let zip_data = response.bytes().map_err(BuildError::Download)?;
+            let reader = std::io::Cursor::new(zip_data);
+            let mut archive = ZipArchive::new(reader)
+                .map_err(|e| BuildError::Io(std::io::Error::other(format!("Failed to read zip archive: {}", e))))?;
+            archive
+                .extract(cache_dir)
+                .map_err(|e| BuildError::Io(std::io::Error::other(format!("Failed to extract zip archive: {}", e))))?;
+        } else {
+            return Err(BuildError::VersionResolution(format!(
+                "Unsupported archive format for asset: {}",
+                asset
+            )));
+        }
+
+        Ok(binary_path)
+    }
+
+    fn post_process_compiler(&self, path: &Path) -> Result<(), BuildError> {
+        #[cfg(unix)]
+        {
+            let mut perms = fs::metadata(path)
+                .map_err(|e| {
+                    BuildError::VersionResolution(format!("File missing or inaccessible at {:?}: {}", path, e))
+                })?
+                .permissions();
+
+            perms.set_mode(0o755);
+            fs::set_permissions(path, perms)
+                .map_err(|e| BuildError::VersionResolution(format!("Failed to set executable permissions: {}", e)))?;
+        }
+
+        let output = Command::new(path)
+            .arg("--help")
+            .output()
+            .map_err(|e| BuildError::VersionResolution(format!("OS refused to execute binary {:?}: {}", path, e)))?;
+
+        if !output.status.success() {
+            let stderr = String::from_utf8_lossy(&output.stderr);
+            let stdout = String::from_utf8_lossy(&output.stdout);
+
+            return Err(BuildError::VersionResolution(format!(
+                "Compiler executed but crashed! \nExit code: {:?}\nStdout: {}\nStderr: {}",
+                output.status.code(),
+                stdout,
+                stderr
+            )));
+        }
+
+        Ok(())
+    }
+
+    fn get_download_path(&self, version: &str) -> PathBuf {
+        self.compilers_dir.join(version).join(self.platform.filename())
+    }
+}
diff --git a/crates/build/src/compiler/mod.rs b/crates/build/src/compiler/mod.rs
new file mode 100644
index 0000000..fff1dc7
--- /dev/null
+++ b/crates/build/src/compiler/mod.rs
@@ -0,0 +1,182 @@
+use reqwest::blocking::Client;
+use serde::Deserialize;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+use crate::error::BuildError;
+
+mod constants;
+mod downloader;
+mod versioning;
+
+use downloader::CompilerDownloader;
+
+/// Represents an executable instance of the Simplicity compiler.
+#[derive(Clone)]
+pub struct Simc {
+    pub binary_path: PathBuf,
+}
+
+#[derive(Deserialize)]
+struct GithubRelease {
+    tag_name: String,
+}
+
+impl Simc {
+    /// Lists all locally installed Simplicity compiler versions
+    pub fn list_downloaded_versions() -> Result<Vec<String>, BuildError> {
+        let cache_dir = home::home_dir()
+            .ok_or_else(|| BuildError::VersionResolution("No home dir".into()))?
+            .join(constants::SMPLX_CACHE_DIR)
+            .join(constants::COMPILERS_DIR_NAME);
+
+        let downloader = CompilerDownloader::new(cache_dir);
+        Ok(downloader.get_downloaded_versions())
+    }
+
+    fn fetch_available_versions() -> Result<Vec<String>, BuildError> {
+        let client = Client::builder()
+            .user_agent(constants::USER_AGENT)
+            .build()
+            .map_err(BuildError::Download)?;
+
+        let response: Vec<GithubRelease> = client
+            .get(constants::GITHUB_API_RELEASES_URL)
+            .send()
+            .map_err(BuildError::Download)?
+            .json()
+            .map_err(|e| {
+                BuildError::VersionResolution(format!("Failed to parse GitHub releases API response: {}", e))
+            })?;
+
+        let versions = response
+            .into_iter()
+            .filter_map(|release| release.tag_name.strip_prefix("simplicityhl-").map(|v| v.to_string()))
+            .collect();
+
+        Ok(versions)
+    }
+
+    /// Resolves the correct compiler version.
+    /// It checks for a native installation first, then falls back to downloading.
+    pub fn resolve(version_req: &str) -> Result<Self, BuildError> {
+        if let Some(native_path) = Self::try_native(version_req) {
+            println!("--> Using native compiler at {}", native_path.display());
+            return Ok(Self {
+                binary_path: native_path,
+            });
+        }
+
+        let cache_dir = home::home_dir()
+            .ok_or_else(|| BuildError::VersionResolution("No home dir".into()))?
+            .join(constants::SMPLX_CACHE_DIR)
+            .join(constants::COMPILERS_DIR_NAME);
+
+        let downloader = CompilerDownloader::new(cache_dir);
+
+        let known_releases = match Self::fetch_available_versions() {
+            Ok(versions) => versions,
+            Err(_) => {
+                let local_versions = downloader.get_downloaded_versions();
+                if local_versions.is_empty() {
+                    return Err(BuildError::VersionResolution(
+                        "Offline and no local compilers found.".into(),
+                    ));
+                }
+                println!("--> WARNING: Could not fetch releases from GitHub. Using local cache.");
+                local_versions
+            }
+        };
+
+        let exact_target = versioning::resolve_target_version(version_req, &known_releases)?;
+
+        let min_supported = semver::Version::parse(constants::MIN_SUPPORTED_COMPILER_VERSION).unwrap();
+        let resolved_version = semver::Version::parse(&exact_target)
+            .map_err(|e| BuildError::VersionResolution(format!("Invalid resolved version: {}", e)))?;
+        if resolved_version < min_supported {
+            return Err(BuildError::VersionResolution(format!(
+                "Resolved compiler version v{} is below the minimum supported version v{}.",
+                exact_target,
+                constants::MIN_SUPPORTED_COMPILER_VERSION
+            )));
+        }
+
+        let max_supported = semver::Version::parse(constants::MAX_SUPPORTED_COMPILER_VERSION).unwrap();
+        if resolved_version > max_supported {
+            println!(
+                "--> WARNING: Resolved compiler version v{} is higher than the maximum tested version v{}. You may experience ABI generation issues.",
+                exact_target,
+                constants::MAX_SUPPORTED_COMPILER_VERSION
+            );
+        }
+
+        if version_req != exact_target {
+            println!(
+                "--> Resolved floating requirement {} to exact version v{}",
+                version_req, exact_target
+            );
+        }
+
+        if !downloader.is_compiler_downloaded(&exact_target) {
+            downloader.download_compiler(&exact_target, true)?;
+        }
+
+        let compiler_info = downloader.get_compiler_binary(&exact_target)?;
+
+        Ok(Self {
+            binary_path: compiler_info.binary_path,
+        })
+    }
+
+    /// Executes the compilation of a single .simf file
+    pub fn compile(&self, src: &Path, out: &Path) -> Result<(), BuildError> {
+        let output = Command::new(&self.binary_path)
+            .arg(src)
+            .output()
+            .map_err(BuildError::Io)?;
+
+        if !output.status.success() {
+            let stderr = String::from_utf8_lossy(&output.stderr);
+            return Err(BuildError::CompilationFailed(format!(
+                "Failed to compile '{}'. Exit code: {}.\n\n{}",
+                src.display(),
+                output.status.code().unwrap_or(1),
+                stderr.trim()
+            )));
+        }
+
+        std::fs::write(out, &output.stdout).map_err(BuildError::Io)?;
+
+        Ok(())
+    }
+
+    /// Attempts to find `simc` in the system PATH that matches the version requirement
+    fn try_native(version_req: &str) -> Option<PathBuf> {
+        let native_path = which::which("simc").ok()?;
+
+        let output = Command::new(&native_path).arg("--version").output().ok()?;
+        if !output.status.success() {
+            return None;
+        }
+
+        let version_str = String::from_utf8_lossy(&output.stdout)
+            .split_whitespace()
+            .last()?
+            .trim_start_matches('v')
+            .to_string();
+
+        let native_version = semver::Version::parse(&version_str).ok()?;
+        let req = semver::VersionReq::parse(version_req).ok()?;
+
+        let min_supported = semver::Version::parse(constants::MIN_SUPPORTED_COMPILER_VERSION).ok()?;
+        if native_version < min_supported {
+            return None;
+        }
+
+        if req.matches(&native_version) {
+            Some(native_path)
+        } else {
+            None
+        }
+    }
+}
diff --git a/crates/build/src/compiler/versioning.rs b/crates/build/src/compiler/versioning.rs
new file mode 100644
index 0000000..aa9dcac
--- /dev/null
+++ b/crates/build/src/compiler/versioning.rs
@@ -0,0 +1,103 @@
+use crate::error::BuildError;
+use semver::{Version, VersionReq};
+
+/// Resolves the highest available version that satisfies the given semver requirement.
+pub fn resolve_target_version(req_str: &str, available_versions: &[String]) -> Result<String, BuildError> {
+    let req =
+        VersionReq::parse(req_str).map_err(|e| BuildError::VersionResolution(format!("Invalid semver: {}", e)))?;
+
+    let mut best_match: Option<Version> = None;
+
+    for v_str in available_versions {
+        if let Some(version) = Version::parse(v_str).ok().filter(|v| req.matches(v)) {
+            match &best_match {
+                Some(current) if version > *current => best_match = Some(version),
+                None => best_match = Some(version),
+                _ => {}
+            }
+        }
+    }
+
+    best_match
+        .map(|v| v.to_string())
+        .ok_or_else(|| BuildError::VersionResolution(format!("No available compiler versions satisfy {}", req_str)))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn get_mock_versions() -> Vec<String> {
+        vec![
+            "0.3.0".to_string(),
+            "0.3.1".to_string(),
+            "0.4.0".to_string(),
+            "0.4.1".to_string(),
+            "0.4.2".to_string(),
+            "0.5.0".to_string(),
+            "1.0.0".to_string(),
+            "1.0.1".to_string(),
+            "1.1.0".to_string(),
+            "2.0.0".to_string(),
+        ]
+    }
+
+    #[test]
+    fn test_resolve_caret() {
+        let versions = get_mock_versions();
+        // For < 1.0.0, caret allows patch updates but locks the minor version
+        assert_eq!(resolve_target_version("^0.4.0", &versions).unwrap(), "0.4.2");
+        assert_eq!(resolve_target_version("^0.3.0", &versions).unwrap(), "0.3.1");
+        // For >= 1.0.0, caret allows minor and patch updates but locks the major version
+        assert_eq!(resolve_target_version("^1.0.0", &versions).unwrap(), "1.1.0");
+    }
+
+    #[test]
+    fn test_resolve_caret_prevents_breaking_changes() {
+        let versions = get_mock_versions();
+        // ^0.4.0 must NOT jump to 0.5.0
+        assert_eq!(resolve_target_version("^0.4.0", &versions).unwrap(), "0.4.2");
+        // ^1.0.0 must NOT jump to 2.0.0
+        assert_eq!(resolve_target_version("^1.0.0", &versions).unwrap(), "1.1.0");
+    }
+
+    #[test]
+    fn test_resolve_tilde() {
+        let versions = get_mock_versions();
+        assert_eq!(resolve_target_version("~0.4.0", &versions).unwrap(), "0.4.2");
+        // Tilde always restricts to patch-level updates when major/minor are specified
+        assert_eq!(resolve_target_version("~1.0.0", &versions).unwrap(), "1.0.1");
+    }
+
+    #[test]
+    fn test_resolve_greater_than_equal() {
+        let versions = get_mock_versions();
+        // Should pick the absolute highest available version
+        assert_eq!(resolve_target_version(">=0.4.0", &versions).unwrap(), "2.0.0");
+    }
+
+    #[test]
+    fn test_resolve_exact() {
+        let versions = get_mock_versions();
+        assert_eq!(resolve_target_version("=1.0.0", &versions).unwrap(), "1.0.0");
+    }
+
+    #[test]
+    fn test_resolve_wildcard() {
+        let versions = get_mock_versions();
+        assert_eq!(resolve_target_version("*", &versions).unwrap(), "2.0.0");
+    }
+
+    #[test]
+    fn test_resolve_multiple_conditions() {
+        let versions = get_mock_versions();
+        assert_eq!(resolve_target_version(">=0.3.0, <0.4.1", &versions).unwrap(), "0.4.0");
+        assert_eq!(resolve_target_version(">=1.0.0, <2.0.0", &versions).unwrap(), "1.1.0");
+    }
+
+    #[test]
+    fn test_resolve_no_match() {
+        let versions = get_mock_versions();
+        assert!(resolve_target_version(">=3.0.0", &versions).is_err());
+    }
+}
diff --git a/crates/build/src/error.rs b/crates/build/src/error.rs
index 140b89a..47a9e9c 100644
--- a/crates/build/src/error.rs
+++ b/crates/build/src/error.rs
@@ -30,4 +30,19 @@ pub enum BuildError {
 
     #[error("Failed to find prefix for a file: {0}")]
     NoBasePathForGeneration(#[from] std::path::StripPrefixError),
+
+    #[error("Failed to download compiler: {0}")]
+    Download(#[from] reqwest::Error),
+
+    #[error("Could not resolve compiler version: {0}")]
+    VersionResolution(String),
+
+    #[error("Compiler verification failed after download")]
+    VerificationFailed,
+
+    #[error("Compilation failed with exit code: {0}")]
+    CompilationFailed(String),
+
+    #[error("Missing compiler version in '{0}'. Please add `#![compiler_version(\"...\")]` to the top of the file.")]
+    MissingCompilerVersion(PathBuf),
 }
diff --git a/crates/build/src/generator.rs b/crates/build/src/generator.rs
index 7e6a38b..b584334 100644
--- a/crates/build/src/generator.rs
+++ b/crates/build/src/generator.rs
@@ -14,6 +14,7 @@ use crate::macros::codegen::{
 use crate::macros::parse::SimfContent;
 
 use super::error::BuildError;
+use crate::compiler::Simc;
 
 pub struct ArtifactsGenerator {}
 
@@ -30,8 +31,9 @@ impl ArtifactsGenerator {
         simfs: &[impl AsRef<Path>],
     ) -> Result<(), BuildError> {
         let tree = Self::build_directory_tree(&base_dir, simfs)?;
+        let mut compilers_cache = HashMap::new();
 
-        Self::generate_bindings(out_dir.as_ref(), tree)?;
+        Self::generate_bindings(out_dir.as_ref(), tree, &mut compilers_cache)?;
 
         Ok(())
     }
@@ -76,13 +78,17 @@ impl ArtifactsGenerator {
         Ok(root)
     }
 
-    fn generate_bindings(out_dir: &Path, path_tree: TreeNode) -> Result<Vec<String>, BuildError> {
+    fn generate_bindings(
+        out_dir: &Path,
+        path_tree: TreeNode,
+        compilers: &mut HashMap<String, Simc>,
+    ) -> Result<Vec<String>, BuildError> {
         fs::create_dir_all(out_dir)?;
 
-        let mut mod_filenames = Self::generate_simfs(out_dir, &path_tree.files)?;
+        let mut mod_filenames = Self::generate_simfs(out_dir, &path_tree.files, compilers)?;
 
         for (dir_name, tree_node) in path_tree.dirs.into_iter() {
-            Self::generate_bindings(&out_dir.join(&dir_name), tree_node)?;
+            Self::generate_bindings(&out_dir.join(&dir_name), tree_node, compilers)?;
             mod_filenames.push(dir_name);
         }
 
@@ -91,34 +97,64 @@ impl ArtifactsGenerator {
         Ok(mod_filenames)
     }
 
-    fn generate_simfs(out_dir: impl AsRef<Path>, simfs: &[impl AsRef<Path>]) -> Result<Vec<String>, BuildError> {
+    fn generate_simfs(
+        out_dir: impl AsRef<Path>,
+        simfs: &[impl AsRef<Path>],
+        compilers: &mut HashMap<String, Simc>,
+    ) -> Result<Vec<String>, BuildError> {
         let mut module_files = Vec::with_capacity(simfs.len());
 
         for simf_file_path in simfs {
-            let mod_name = Self::generate_simf_file(out_dir.as_ref(), simf_file_path)?;
+            let mod_name = Self::generate_simf_file(out_dir.as_ref(), simf_file_path, compilers)?;
             module_files.push(mod_name);
         }
 
         Ok(module_files)
     }
 
-    fn generate_simf_file(out_dir: impl AsRef<Path>, simf_file_path: impl AsRef<Path>) -> Result<String, BuildError> {
+    fn generate_simf_file(
+        out_dir: impl AsRef<Path>,
+        simf_file_path: impl AsRef<Path>,
+        compilers: &mut HashMap<String, Simc>,
+    ) -> Result<String, BuildError> {
         let simf_file_buf = PathBuf::from(simf_file_path.as_ref());
+
         let simf_content =
             SimfContent::extract_content_from_path(&simf_file_buf).map_err(BuildError::FailedToExtractContent)?;
 
+        let raw_req = simf_content
+            .extract_version()
+            .ok_or_else(|| BuildError::MissingCompilerVersion(simf_file_buf.clone()))?;
+
+        let simc = if let Some(cached) = compilers.get(&raw_req) {
+            cached.clone()
+        } else {
+            println!(
+                "--> Detected compiler requirement: {} (for {})",
+                raw_req,
+                simf_file_buf.display()
+            );
+            let resolved = Simc::resolve(&raw_req)?;
+            compilers.insert(raw_req.clone(), resolved.clone());
+            resolved
+        };
+
         let contract_name = simf_content.contract_name.clone();
-        let output_file = out_dir.as_ref().join(format!("{}.rs", &contract_name));
 
+        let output_rs_file = out_dir.as_ref().join(format!("{}.rs", &contract_name));
         let mut file = fs::OpenOptions::new()
             .create(true)
             .write(true)
             .truncate(true)
-            .open(&output_file)?;
-        let code = Self::generate_simf_binding_code(simf_content, simf_file_buf)?;
+            .open(&output_rs_file)?;
 
+        let code = Self::generate_simf_binding_code(simf_content, simf_file_buf.clone())?;
         Self::expand_file(code, &mut file)?;
 
+        let output_bin_file = out_dir.as_ref().join(format!("{}.bin", &contract_name));
+        println!("Compiling {}...", simf_file_buf.display());
+        simc.compile(&simf_file_buf, &output_bin_file)?;
+
         Ok(contract_name)
     }
 
diff --git a/crates/build/src/lib.rs b/crates/build/src/lib.rs
index 06ccd25..34c39ad 100644
--- a/crates/build/src/lib.rs
+++ b/crates/build/src/lib.rs
@@ -1,3 +1,4 @@
+pub mod compiler;
 pub mod config;
 pub mod error;
 pub mod generator;
diff --git a/crates/build/src/macros/parse.rs b/crates/build/src/macros/parse.rs
index 3cdd34d..3f5fcd3 100644
--- a/crates/build/src/macros/parse.rs
+++ b/crates/build/src/macros/parse.rs
@@ -151,6 +151,20 @@ impl SimfContent {
         syn::parse_str::<syn::Ident>(s).is_err()
     }
 
+    /// Extracts the compiler version requirement from the loaded content
+    pub fn extract_version(&self) -> Option<String> {
+        for line in self.content.lines() {
+            if let Some(version) = line
+                .trim()
+                .strip_prefix("#![compiler_version(\"")
+                .and_then(|r| r.strip_suffix("\")]"))
+            {
+                return Some(version.to_string());
+            }
+        }
+        None
+    }
+
     pub fn extract_content_from_path(path: &PathBuf) -> std::io::Result<SimfContent> {
         let contract_name = {
             let name = path
diff --git a/crates/cli/src/cli.rs b/crates/cli/src/cli.rs
index 54aa53d..a40e947 100644
--- a/crates/cli/src/cli.rs
+++ b/crates/cli/src/cli.rs
@@ -5,6 +5,7 @@ use clap::Parser;
 use crate::commands::Command;
 use crate::commands::build::Build;
 use crate::commands::clean::Clean;
+use crate::commands::compilers::Compilers;
 use crate::commands::init::Init;
 use crate::commands::regtest::Regtest;
 use crate::commands::test::Test;
@@ -64,6 +65,7 @@ impl Cli {
 
                 Ok(Clean::run(loaded_config.build)?)
             }
+            Command::Compilers => Ok(Compilers::run()?),
         }
     }
 }
diff --git a/crates/cli/src/commands/build.rs b/crates/cli/src/commands/build.rs
index 337e7f2..3999458 100644
--- a/crates/cli/src/commands/build.rs
+++ b/crates/cli/src/commands/build.rs
@@ -10,10 +10,8 @@ impl Build {
         let src_dir = ArtifactsResolver::resolve_local_dir(&config.src_dir)?;
         let files_to_build = ArtifactsResolver::resolve_files_to_build(&config.src_dir, &config.simf_files)?;
 
-        Ok(ArtifactsGenerator::generate_artifacts(
-            &output_dir,
-            &src_dir,
-            &files_to_build,
-        )?)
+        tokio::task::block_in_place(|| ArtifactsGenerator::generate_artifacts(&output_dir, &src_dir, &files_to_build))?;
+
+        Ok(())
     }
 }
diff --git a/crates/cli/src/commands/compilers.rs b/crates/cli/src/commands/compilers.rs
new file mode 100644
index 0000000..b4e41cb
--- /dev/null
+++ b/crates/cli/src/commands/compilers.rs
@@ -0,0 +1,22 @@
+use smplx_build::compiler::Simc;
+
+use crate::commands::error::CommandError;
+
+pub struct Compilers {}
+
+impl Compilers {
+    pub fn run() -> Result<(), CommandError> {
+        let versions = Simc::list_downloaded_versions()?;
+
+        if versions.is_empty() {
+            println!("No Simplicity compilers are currently installed.");
+        } else {
+            println!("Installed Simplicity compilers:");
+            for v in versions {
+                println!("  - v{}", v);
+            }
+        }
+
+        Ok(())
+    }
+}
diff --git a/crates/cli/src/commands/core.rs b/crates/cli/src/commands/core.rs
index 5a08505..1f9a311 100644
--- a/crates/cli/src/commands/core.rs
+++ b/crates/cli/src/commands/core.rs
@@ -23,6 +23,8 @@ pub enum Command {
     Build,
     /// Clean Simplex artifacts in the current directory
     Clean,
+    /// Lists locally installed Simplicity compiler versions
+    Compilers,
 }
 
 #[derive(Debug, Args, Copy, Clone)]
diff --git a/crates/cli/src/commands/mod.rs b/crates/cli/src/commands/mod.rs
index 50cb5fb..089c436 100644
--- a/crates/cli/src/commands/mod.rs
+++ b/crates/cli/src/commands/mod.rs
@@ -1,5 +1,6 @@
 pub mod build;
 pub mod clean;
+pub mod compilers;
 pub mod core;
 pub mod error;
 pub mod init;