ComputeFirst

Multihash decode

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

Strictly decode a canonical bounded hexadecimal multihash.

Use when you need to: decode canonical multihash bytes · inspect multihash algorithm code · extract digest from multihash.

Decide before calling

Read the versioned contract and the supported scope below. Reuse multihash-decode@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-decode@1.0.0 for decode canonical multihash bytes. 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

Not supported

Behavior

Input

Output

Limits

Example

Request input:

{
  "multihash": "12200000000000000000000000000000000000000000000000000000000000000000"
}

Response:

{
  "result": {
    "algorithm": "sha2-256",
    "code": 18,
    "digest": "0000000000000000000000000000000000000000000000000000000000000000",
    "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-decode",
  "version": "1.0.0",
  "input": {
    "multihash": "12200000000000000000000000000000000000000000000000000000000000000000"
  }
}

HTTP (no key)

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

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

CLI

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

Get the client at /clients/cli/.