modbender --- name: settlement-witness description: "Generate a signed delivery receipt in under 30 seconds."
SettlementWitness
Generate a signed delivery receipt in under 30 seconds.
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settlement_witness({ task_id: "quickstart-001", spec: { value: 1 }, output: { value: 1 } })
You should receive:
PASS
SPEC_MATCH
receipt_id starting with sha256:
sig starting with base64url:
Example (truncated):
{ "receipt_v0_1": { "verdict": "PASS", "reason_code": "SPEC_MATCH", "receipt_id": "sha256:3adb22d0...", "sig": "base64url:AbC..." } }
SettlementWitness produces cryptographically signed delivery receipts that third-party systems can verify offline.
Common Failure Modes
If you see 422
Missing required field. Ensure task_id, spec, and output are present.
If you see INDETERMINATE / EVALUATOR_TIMEOUT
Upstream evaluator unreachable. This is still a valid signed receipt.
If you see FAIL / SPEC_MISMATCH
Your output does not match your spec. Compare structures.
Live Examples / Fixtures
See working PASS, FAIL, and INDETERMINATE examples here:
fixtures/
Endpoints
MCP:
POST https://defaultverifier.com/mcp
Direct REST:
POST https://defaultverifier.com/settlement-witness
Safety Notes
Never send secrets in spec or output. Keep inputs deterministic.