FreeSign — Free e-signature

• 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 s
• 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 m
• 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. Eac
• 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 mat

No long description beyond the summary.