FreeSign — Free e-signature

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "freesign-free-e-signature": {
      "type": "http",
      "url": "https://free-sign.com/mcp"
    }
  }
}

5 tools

• create_signing_envelope

  Create a FreeSign envelope from a PDF SHA-256 hash. Do not send PDF bytes. The created envelope is NOT yet session-bound — the browser that opens the returned signing_url generates an ECDSA P-256 keypair locally and POSTs the public JWK to /api/envelopes/{id}/session-bind before…

• verify_document_hash

  Find FreeSign receipts matching a local document SHA-256 hash.

• get_receipt

  Return the envelope record (including final_pdf_sha256, final_signature_base64url, final_payload_json), per-signer signing receipts, and OpenTimestamps anchor metadata. Evidence only, never PDF bytes.

• get_ots_proof

  Return the .ots proof (base64) for a given OpenTimestamps anchor on an envelope. Use the official `ots-cli` to verify offline against Bitcoin block headers. Each seal has two anchors: `kind: "byterange"` commits to the signed document, `kind: "signed_attrs"` commits to SHA-256…

• verify_audit_chain

  Return an envelope's append-only audit-event hash chain together with a server-computed integrity verdict: every event_hash is recomputed from its canonical material, and the prev_event_hash linkage and per-envelope seq contiguity are checked. Evidence only, never PDF bytes. The…

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