{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://veritasacta.com/schemas/receipt-v2.json",
  "title": "Veritas Acta Decision Receipt (v2 envelope)",
  "description": "Expected shape of a protect-mcp@0.7.4 receipt. Mirrors draft-farley-acta-signed-receipts; the decision facts live in payload, signed as a unit.",
  "type": "object",
  "required": [
    "v",
    "type",
    "algorithm",
    "kid",
    "issuer",
    "issued_at",
    "payload",
    "signature"
  ],
  "properties": {
    "v": {
      "type": "integer",
      "const": 2
    },
    "type": {
      "type": "string",
      "enum": [
        "decision_receipt",
        "gateway_restraint"
      ]
    },
    "algorithm": {
      "type": "string",
      "const": "ed25519"
    },
    "kid": {
      "type": "string"
    },
    "issuer": {
      "type": "string"
    },
    "issued_at": {
      "type": "string",
      "format": "date-time"
    },
    "payload": {
      "type": "object",
      "required": [
        "tool",
        "decision"
      ],
      "properties": {
        "tool": {
          "type": "string"
        },
        "decision": {
          "type": "string",
          "enum": [
            "allow",
            "deny"
          ]
        },
        "reason_code": {
          "type": "string"
        },
        "policy_digest": {
          "type": "string"
        },
        "request_id": {
          "type": "string"
        },
        "spec": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "signature": {
      "type": "string",
      "minLength": 32
    }
  },
  "additionalProperties": true
}