Multihash digest verify

multihash-digest-verify · version 1.0.0 · Hashing & signatures · free, no key needed

Verify exact digest bytes and optional algorithm against a canonical multihash.

Use when you need to: verify digest matches multihash · detect multihash algorithm confusion · compare digest bytes with multihash.

Decide before calling

Read the versioned contract and the supported scope below. Reuse multihash-digest-verify@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use multihash-digest-verify@1.0.0 for verify digest matches multihash. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

• verify digest matches multihash
• detect multihash algorithm confusion
• compare digest bytes with multihash
• check multihash digest equality
• validate expected multihash algorithm
• audit content address digest envelope

Not supported

• hashing message content
• signature or identity verification

Behavior

• A well-typed mismatch, including an explicit different algorithm, returns valid false.
• Malformed or noncanonical multihashes throw invalid_input.
• Verification is security-sensitive; callers must separately enforce an acceptable algorithm policy.

Input

• multihash (string, required): max length 136; pattern ^(?:[0-9a-f]{2})*$
• digest (string, required): max length 128; pattern ^(?:[0-9a-f]{2})*$
• algorithm (one of "sha2-256", "sha2-512", "sha3-512", "sha3-384", "sha3-256", "sha3-224", "blake3", "blake2b-256", "blake2b-512", "blake2s-256", optional)

Output

• valid (boolean, required)
• algorithm (string, required)
• code (integer, required): min 0
• digest_size (integer, required): min 0; max 64
• standard (string, required)
• reference (string, required)
• data_version (string, required)

Limits

• max multihash bytes: 68
• max digest bytes: 64

Example

Request input:

{
  "multihash": "12200000000000000000000000000000000000000000000000000000000000000000",
  "digest": "0000000000000000000000000000000000000000000000000000000000000000"
}

Response:

{
  "result": {
    "valid": true,
    "algorithm": "sha2-256",
    "code": 18,
    "digest_size": 32,
    "standard": "Multiformats Multihash specification",
    "reference": "multihash = varint(code) || varint(size) || digest; unsigned LEB128 must be minimally encoded",
    "data_version": "multicodec-2026-10-24"
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "multihash-digest-verify",
  "version": "1.0.0",
  "input": {
    "multihash": "12200000000000000000000000000000000000000000000000000000000000000000",
    "digest": "0000000000000000000000000000000000000000000000000000000000000000"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/multihash-digest-verify/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"multihash":"12200000000000000000000000000000000000000000000000000000000000000000","digest":"0000000000000000000000000000000000000000000000000000000000000000"}'

The machine-readable contract is at /v1/tools/multihash-digest-verify/versions/1.0.0.

CLI

node cli.mjs run multihash-digest-verify 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Oci descriptor verify: Verify supplied bytes against an OCI descriptor digest and size.
• Multihash decode: Strictly decode a canonical bounded hexadecimal multihash.
• Xxh3 vector suite verify: Verify a bounded public suite of expected XXH3-64 and XXH3-128 known-answer vectors.
• Adler-32 chunks verify: Verify that an ordered chunk list and a whole message have identical Adler-32 checksums.
• Crc catalog check: Compare a claimed CRC with one pinned RevEng model, including CRC-12/UMTS.
• Hash digest verify: Recompute a fixed-length digest over encoded input bytes and compare it to an expected digest given in any encoding.