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io.github.Mlartab2/canonicalhash

by Mlartab2 · remote · no sign-in to list tools · v1.0.0 · published by GitHub user Mlartab2

Deterministic JSON hashing and EIP-712 attestations for AI agents via x402.

Changes · 5
CompareRegistry entry

5 tools: 5 change things.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http canonicalhash https://canonicalhash-production.up.railway.app/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Changes things 5Claude Code: ask
  • batch_canonicalizeBatch canonicalize up to 1000 JSON payloads in one call.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Batch canonicalize up to 1000 JSON payloads in one call.

    Annotations the server declares

    • paymentHint: true
  • canonicalizeCanonicalize JSON with RFC 8785 and return a SHA-256 hash plus an EIP-712 signed attestation.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Canonicalize JSON with RFC 8785 and return a SHA-256 hash plus an EIP-712 signed attestation.

    Annotations the server declares

    • paymentHint: true
  • create_receiptGenerate a tamper-evident EIP-712 action receipt for an agent decision.No findings

    Why it is in this group

    • The name "create_receipt" says "create": a word for a change.
    Description, as the server wrote it
    Generate a tamper-evident EIP-712 action receipt for an agent decision.

    Annotations the server declares

    • paymentHint: true
  • structure_extractionExtract structured JSON from messy text (emails, logs, tickets) using regex or Needle 3.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Extract structured JSON from messy text (emails, logs, tickets) using regex or Needle 3.

    Annotations the server declares

    • paymentHint: true
  • verify_attestationVerify an EIP-712 attestation against the published public key.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Verify an EIP-712 attestation against the published public key. Always free.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http canonicalhash https://canonicalhash-production.up.railway.app/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__canonicalhash__canonicalize",
      "mcp__canonicalhash__batch_canonicalize",
      "mcp__canonicalhash__create_receipt",
      "mcp__canonicalhash__structure_extraction",
      "mcp__canonicalhash__verify_attestation"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as canonicalhash. Review it before you use it.