SettlementWitness MCP

SettlementWitness is a stateless MCP verification tool that returns replay-stable settlement receipts (PASS/FAIL) by forwarding task_id, spec, and output to the Default Settlement Verifier. Designed for agent execution gating and x402 settlement flows.

GitHub

Default Settlement Verifier (SettlementWitness)

Verifiable settlement layer for autonomous agents.

Deterministic. Stateless. x402-compatible.

Supports: attestation -> payment -> settlement -> offline verification

Architecture

Understand the SAR stack and verification model:

šŸ‘‰ SAR Architecture

Example Response

{ "witness": "SettlementWitness", "witness_version": "v0", "task_id": "example", "verifier_endpoint": "https://defaultverifier.com/verify", "witness_timestamp": "2026-01-01T00:00:00Z", "receipt_id": "...", "receipt_v0_1": { "task_id_hash": "sha256:...", "verdict": "PASS", "confidence": 1.0, "reason_code": "SPEC_MATCH", "ts": "...", "verifier_kid": "...", "receipt_id": "sha256:...", "sig": "base64url:..." },

"counterparty": "0xABC...",

"_ext": { "agent_id": "0x123:demo" } }

Notes

  • receipt_v0_1 is the signed, canonical payload
  • counterparty is optional and NOT signed
  • Fully backward compatible with SAR v0.1

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