FreeSign

FreeSign is a free e-signature (electronic signature, esignature) service that runs entirely in the user's browser - no upload, no account, no monthly cap, no watermark. It produces a real, standards-based PAdES-B-T electronic signature legally recognised under US ESIGN/UETA and EU eIDAS (Advanced Electronic Signature).

该来源不提供完整文件导出（国内平台多为平台内托管），仅存元数据与原链

接入信息

传输形态: http
鉴权方式: 鉴权未知
端点: https://sign.run.tools

鉴权方式未标注，请核对官方文档后再接入——不要直接使用以下片段

{
  "mcpServers": {
    "FreeSign": {
      "url": "https://sign.run.tools"
    }
  }
}

能力清单

工具	说明
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 any protected request will succeed. AI agents calling this tool just hand the signing_url to a human, who continues in a browser.
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.
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 raw events are included verbatim so the caller can independently re-derive the verdict instead of trusting `chain.valid`.

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