# TaskHawk Kevros Provenance Attestation

> TaskHawk Kevros Provenance Attestation is a paid API for AI agents from governance.taskhawktech.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-12).

Creates a hash-chained attestation record proving what an agent did, linking each action into a verifiable provenance chain

## Facts

- Endpoint: POST https://governance.taskhawktech.com/governance/attest?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/taskhawk-kevros-provenance-attestation-6191f6c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Cl-uSTpLCaerQVGuwhGaX

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability taskhawk-kevros-provenance-attestation-6191f6c2 -d '<json body>'
```

Example prompt: Record a hash-chained provenance attestation for agent 'agent_xyz' proving it just executed a data transfer action — the action description is 'transferred 500 records from source DB to destination warehouse'.

## When to prefer this

Use this endpoint when you need cryptographic, hash-chained proof of what an AI agent did — not just a log entry, but a verifiable provenance record where each action is linked to the previous one. Ideal for compliance, audit trails, multi-step agent workflows requiring tamper-evident records, or when downstream systems need to verify agent behavior. Prefer this over generic logging when the integrity and unchainability of the record matters.

## Known failure modes

- Missing agent_id returns 400 with validation error
- Malformed action_payload object returns 400
- Chain integrity failure if prior hash is corrupted returns 500
- Payment not received returns 402 requiring x402 micropayment of $0.02 USDC
- Service unavailable returns 503 if hashing backend is down

## How this service works

Prove what you did — hash-chained provenance attestation

## Output

Returns a JSON object containing the current action's hash (hash_curr), the previous chain link hash (hash_prev, all zeros if first entry), the cumulative chain_length, and a unique attestation_id — together proving the action's place in an immutable provenance chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "agent_id",
      "action_description",
      "action_payload"
     ],
     "properties": {
      "agent_id": {
       "type": "string",
       "description": "Agent identifier"
      },
      "action_payload": {
       "type": "object",
       "description": "Action details"
      },
      "action_description": {
       "type": "string",
       "description": "What was done"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "hash_curr": "a1b2c3d4e5f6...",
  "hash_prev": "0000000000000000",
  "chain_length": 1,
  "attestation_id": "att_001"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/taskhawk-kevros-provenance-attestation-6191f6c2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from governance.taskhawktech.com](https://www.zero.xyz/host/governance.taskhawktech.com/llms.txt)