Default Settlement

Find the right surface

Default Settlement is a router into public evidence, technical specifications, and integration paths. It shows when an agent activated, whether execution was verified, whether continuity was maintained, how evidence was chained, and where trust can be independently inspected.

What problem this solves

An agent can claim it completed work. A platform can display success. A payment rail can move funds. But without independent verification, the claim itself is still trusted instead of proven.

• Outputs may not match the agreed specification.
• Verification logic may be opaque, mutable, or platform-specific.
• Settlement may happen before anyone can independently verify delivery.

Default Settlement makes autonomous system trust inspectable, replayable, and independently verifiable across the full evidence loop: activation, SAR receipt, continuity receipt, chained evidence, Agent Profile, badge verification, and Public Trust Report.

Public verification network

The Explorer is the live proof surface for Default Settlement. Use it to inspect Public Trust Reports, lookup signed evidence, follow chained provenance, and verify receipt cryptography in the browser.

The execution boundary layer

Default Settlement sits at the boundary between autonomous agent claims and public trust decisions.

Learn more about Continuity →

Try a live signed receipt

Generate a cryptographically signed SAR receipt in under 5 seconds.

curl -s https://defaultverifier.com/settlement-witness/attest \
-H 'Content-Type: application/json' \
-d '{"task_id":"demo-curl-pass","agent_id":"demo-agent","counterparty":"demo-counterparty","spec":{"deliverable":"hello"},"output":{"deliverable":"hello"}}' \
| jq '{verdict: .payload.verdict, receipt_id: .payload.receipt_id, kid: .kid}'

{
  "verdict": "PASS",
  "receipt_id": "sha256:...",
  "kid": "sar-prod-ed25519-03"
}

Get started in 30 seconds

Try it in 2 minutes: View full demo

1. Send a request to /settlement-witness
2. Receive a signed settlement receipt (SAR)

A SAR is a signed, portable receipt proving whether a task satisfied its specification — verifiable by anyone, offline, forever.

3. Verify receipt_v0_1 offline
4. Trigger payment only after PASS

No account. No API key. Deterministic and replayable.

Integrations

SettlementWitness integrates across the autonomous agent stack to verify delivery before settlement.

Execution systems produce outputs. Identity systems attest actors. Payment systems move funds.

SettlementWitness closes the trust gap — issuing deterministic receipts that confirm whether delivery occurred before funds release.

No custody. No enforcement. Attestations only.

Attestation → Payment → Settlement → Reputation

V1 Integrations

Shipped scope: compatibility positioning. Logos can be added after permissions are confirmed.

Settlement Endpoint (Canonical)

curl -X POST https://defaultverifier.com/settlement-witness \
-H "Content-Type: application/json" \
-d '{
  "task_id": "quickstart-001",
  "agent_id": "0x123:demo",
  "counterparty": "0xABCDEF1234567890",
  "spec": {"expected": "hello"},
  "output": {"result": "hello"}
}'

{
  "witness": "SettlementWitness",
  "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": "0xABCDEF1234567890",
  "_ext": {
    "agent_id": "0x123:demo"
  }
}

Note: receipt_v0_1 is the signed payload. When counterparty is present, it is included in signature scope and receipt_id derivation.

This is the primary endpoint for signed settlement receipts.

POST https://defaultverifier.com/settlement-witness

Verification Endpoint (Low-Level)

POST https://defaultverifier.com/verify

curl -X POST https://defaultverifier.com/verify \
-H "Content-Type: application/json" \
-d '{
  "task_id": "example-001",
  "spec": { "expected": "foo" },
  "output": { "result": "foo" }
}'

{
  "verdict": "PASS",
  "confidence": 1.0,
  "signature": "0x...",
  "fee_due": "0.001",
  "fee_enforced": false
}

MCP Access

• MCP Server: https://defaultverifier.com/mcp
• Tool: settlement_witness
• Arguments: task_id, spec, output
• Returns: replay-stable receipt JSON (verbatim)

Standards & Compatibility

• Verifier Interface v0.1 — Public interface for independently verifiable agent settlement evidence
• SAR v0.1 — Settlement Attestation Receipt format and fixture surface
• Continuity v0.1 — Pre/post execution continuity and chained receipt semantics
• ERC-8004 — Agent identity and verifier compatibility
• MCP — Compatible invocation semantics
• x402 — Agent-native payment workflow compatibility
• Agent Governance — Alignment with emerging governance vocabulary and interoperability work

Trust & Neutrality

This verifier is intentionally simple, stateless, and neutral.

It can be used as a verification gate to reduce fraudulent or unverifiable agent settlements.

No custody. No discretionary overrides. No privileged actors. Attestations only.

About Default Settlement

Default Settlement Inc. is the steward of SettlementWitness, DefaultVerifier, SAR Explorer, and related continuity verification surfaces.

The system is SAR-compatible and participates in the broader SAR ecosystem. It does not claim ownership of sarprotocol.org, which is maintained separately.

Default Settlement is machine trust infrastructure for autonomous systems, providing portable evidence for agent activation, verified execution, continuity, chained provenance, badge verification, and public trust inspection.