# PriorSeal Evidence Receipt Check

> PriorSeal Evidence Receipt Check is a paid API for AI agents from priorseal.xyz, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Verifies the current status and validity of a previously issued PriorSeal evidence receipt, confirming finality state and receipt authenticity on EVM or Solana.

## Facts

- Endpoint: GET https://priorseal.xyz/v1/evidence/receipts/%7BreceiptId%7D/check?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/priorseal-evidence-receipt-check-71481aab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HG0raRu5VVIChDwl1kkt0

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 priorseal-evidence-receipt-check-71481aab
```

Example prompt: Can you check the current status and finality of PriorSeal evidence receipt psc_abc123def456 and tell me whether it's been confirmed and the verification came back valid?

## When to prefer this

Use this endpoint when you need to independently verify that a PriorSeal evidence receipt is authentic, confirmed, and finalized — especially in multi-party workflows where one party needs cryptographic assurance that a pre-execution authorization actually corresponds to observed on-chain execution. Prefer this over general blockchain explorers when you need portable, signed evidence that a third party can verify without trusting the original issuer directly.

## Known failure modes

- Receipt ID not found — returns an error if the receiptId does not correspond to any known receipt
- Receipt pending — status may be non-final if the underlying transaction has not yet reached finality
- Invalid receiptId format — if receiptId exceeds 512 characters or is empty, the request is rejected
- Receipt tampered or invalid — receiptVerification.valid returns false if the receipt signature does not pass
- Service unavailable — network or upstream blockchain node issues may cause transient failures

## How this service works

Connect explicit, pre-execution authorization to observed EVM and Solana execution with portable evidence another party can verify independently.

## Output

Returns a JSON object containing the issuer (priorseal.xyz), the schema version, a unique checkId, the current status (e.g. CONFIRMED) and finalityState (e.g. FINALIZED) of the receipt, the signing algorithm used (e.g. Ed25519), and a receiptVerification object with a code (e.g. OK) and a boolean valid flag.

## 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",
    "pathParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "receiptId"
     ],
     "properties": {
      "receiptId": {
       "type": "string",
       "maxLength": 512,
       "minLength": 1
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "format": {
     "type": "string"
    },
    "example": {}
   },
   "additionalProperties": false
  }
 },
 "additionalProperties": false
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "format": "priorseal.fresh-evidence-check.v1",
 "example": {
  "issuer": "priorseal.xyz",
  "schema": "priorseal.fresh-evidence-check.v1",
  "checkId": "psc_example",
  "current": {
   "status": "CONFIRMED",
   "finalityState": "FINALIZED"
  },
  "algorithm": "Ed25519",
  "receiptVerification": {
   "code": "OK",
   "valid": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/priorseal-evidence-receipt-check-71481aab/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from priorseal.xyz](https://www.zero.xyz/host/priorseal.xyz/llms.txt)