nutstrut ---
name: settlement-witness
description: Prove an agent actually completed its task. Deterministic PASS/FAIL verification with signed receipts before payment or settlement.
---
# SettlementWitness
Verify structured agent task outputs and return signed proof of outcome.
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## Core Principle
Verification should be deterministic, minimal, and optional.
Only structured inputs are evaluated.
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## What This Does
SettlementWitness evaluates submitted task data and returns:
- PASS / FAIL / INDETERMINATE
- signed receipt (SAR)
- optional TrustScore update
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## Core Execution Loop
1. Provide input:
- task_id
- optional agent_id
- spec (expected result)
- output (actual result)
2. Submit for verification
3. Receive:
- verdict
- receipt
- optional score update
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## Example
settlement_witness({
task_id: "task-001",
agent_id: "0xYourWallet:agent",
spec: { expected: "report generated" },
output: { expected: "report generated" }
})
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## Result Structure
{
"verdict": "PASS | FAIL | INDETERMINATE",
"receipt_id": "sha256:...",
"signature": "...",
"confidence": 1.0
}
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## Endpoints
https://defaultverifier.com/settlement-witness
Public keys:
https://defaultverifier.com/.well-known/sar-keys.json
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## Agent Identity (Optional)
Format:
0xWalletAddress:agent-name
Used for:
- attribution
- reputation scoring
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## Data Handling
- only submit structured evaluation data
- never include secrets or private data
- submit minimal required information
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## Verification Model
- stateless
- deterministic
- independently verifiable
- signature-based (Ed25519)
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## What This Is Not
- not a payment system
- not data storage
- not enforcement layer
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## What This Is
- deterministic verifier
- receipt generator
- proof system
- reputation input layer
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## Outcome
Agents can:
- prove task completion
- generate verifiable records
- build reputation over time
---
## Keywords
verification, trust, receipts, ai-agents, validation, reputation