# FreeSign — Free e-signature MCP server

Agent View of the PolicyLayer registry record for FreeSign — Free e-signature: identity, probed posture, risk grade, and all 5 tools classified. HTML page: https://policylayer.com/tools/com-free-sign-signing

## Facts

- Server id: `https://free-sign.com/mcp`
- Homepage: https://github.com/https://free-sign.com/mcp
- Registry record: grade C, identity unverified
- Lifecycle: active
- Auth posture: open
- CORS policy: *
- Rate-limited: no
- Tools: 5 (5 with introspected schema)
- Tool categories present: Read, Write
- Context-window cost: 581 tokens per request — https://policylayer.com/token-cost/com-free-sign-signing
- Tags: com free sign signing
- Record last modified: 2026-08-18T05:06:07.242Z

## Tools (5)

| Tool | Category | Risk | Record |
| --- | --- | --- | --- |
| `get_ots_proof` | Read | Low | https://policylayer.com/tools/com-free-sign-signing/get-ots-proof.md |
| `get_receipt` | Read | Low | https://policylayer.com/tools/com-free-sign-signing/get-receipt.md |
| `verify_audit_chain` | Read | Low | https://policylayer.com/tools/com-free-sign-signing/verify-audit-chain.md |
| `verify_document_hash` | Read | Low | https://policylayer.com/tools/com-free-sign-signing/verify-document-hash.md |
| `create_signing_envelope` | Write | Medium | https://policylayer.com/tools/com-free-sign-signing/create-signing-envelope.md |

## Tool descriptions

- `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:…
- `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.
- `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 ch…
- `verify_document_hash` — Find FreeSign receipts matching a local document SHA-256 hash.
- `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 …

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=com-free-sign-signing · API: https://policylayer.com/registry/api · Recommended policies for every tool: https://policylayer.com/policies/com-free-sign-signing