Receipt Inspector · Open source · No signup

Verify a receipt

Paste a PSR-001 receipt JSON. The inspector validates it against the spec, recomputes the receipt hash, renders every field, and — if the receipt contains ONLY Lang replay inputs — re-executes the evaluation in your browser using the WASM verifier. No data leaves your machine.

Paste

Receipt JSON goes in the box

Validate

Required fields, hash, structure

Replay

WASM verifier re-runs the evaluation

Confirm

Result matches → decision verified

Paste a PSR-001 receipt JSON

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{
  "spec_version": "PSR-001",
  "receipt_id": "rcpt_2026-09-12T14:30:00Z_a1b2c3d4",
  "timestamp": "2026-09-12T14:30:00.123Z",
  "gate_state": "ALLOW",
  "reason": "Budget within limits, bounds satisfied, no bias detected",
  "policy": {
    "language": "only-lang",
    "version": "1.2.0",
    "script_hash": "a3f5e8c1d2b4a3f5e8c1d2b4a3f5e8c1d2b4a3f5e8c1d2b4a3f5e8c1d2b4a3f5",
    "script_source": "https://only.institute/policies/lending-v1.2.0.only"
  },
  "input": {
    "input_hash": "f7e2d1c9b8a6f7e2d1c9b8a6f7e2d1c9b8a6f7e2d1c9b8a6f7e2d1c9b8a6f7e2",
    "input_type": "transaction",
    "field_values": [
      0.45,
      0.3,
      0.25
    ],
    "metadata": {
      "tool": "loan_approval",
      "action": "approve",
      "amount_sanitized": true
    }
  },
  "evidence": {
    "residual": 1.23e-8,
    "residual_history": [
      0.15,
      0.08,
      0.03,
      1.23e-8
    ],
    "indices_healed": [
      2
    ],
    "reason_codes": [
      "within_budget",
      "within_bounds",
      "no_bias"
    ],
    "explanation": "Field 2 was healed from 0.0 to 0.25. Residual converged to 1.23e-8.",
    "replay_inputs": {
      "signs": [
        1,
        -1,
        1,
        -1
      ],
      "field": [
        0.45,
        0.3,
        0.25,
        0
      ],
      "script": "harmony([0.5, 0.3, 0.2])\nassert_bounds(0, 50, 0)\nbudget_limit(500)"
    }
  },
  "identity": {
    "agent_id": "loan-agent-001"
  },
  "receipt_hash": "e9c4f7a2b1d8e9c4f7a2b1d8e9c4f7a2b1d8e9c4f7a2b1d8e9c4f7a2b1d8e9c4",
  "signature": {
    "algorithm": "ed25519",
    "public_key": "MCowBQYDK2VwAyEAfakekeyfornow",
    "signature": "MEUCIQDkfakefornow"
  }
}

What this proves

The decision was correct. The replayed evaluation matches the receipt's gate_state and residual.
The receipt is authentic. The recomputed receipt_hash matches the one in the receipt.
The policy was not changed. The script_hash in the receipt binds the decision to a specific policy version.
You did not trust the system. You verified it. The verifier is open source. The evaluation ran in your browser.

Verify at scale, via API Read the PSR-001 spec For auditors Run DGV test cards Try the governance gate