Settlement Witness MCP server

What it does

Settlement Witness is an MCP adapter that emits cryptographically signed Settlement Attestation Receipts (SARs) proving whether an AI agent completed a task according to its specification. It is for developers who need to verify task completion and maintain a public receipt registry.

• Submit a task with expected output conditions and receive a signed receipt confirming pass/fail/indeterminate verdict.
• Retrieve and verify previously issued receipts using public Ed25519 keys and local verification code.
• Query recent verification receipts by wallet address to audit task completion history.

Tools this server exposes

Tool	Does
create_receipt	Submit a task verification request with task_id, specification checks, output, and optional counterparty; returns a signed SAR receipt.
retrieve_receipt	Fetch a previously issued receipt by its receipt_id (sha256 hash).
query_wallet_receipts	Retrieve recent receipts associated with a specific wallet address.
get_verification_keys	Fetch the current set of public Ed25519 keys (JWKS format) used to verify receipt signatures.
get_key_registry	Retrieve the SAR protocol key registry showing active and retired signer keys by verifier_kid.

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.