{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://agent-receipts.dev/schemas/receipt-v1.schema.json",
  "title": "agent-receipts/v1 receipt",
  "type": "object",
  "required": [
    "schema",
    "id",
    "vault_id",
    "sequence",
    "issued_at",
    "action",
    "payload_hash",
    "prev_receipt_hash",
    "key_id",
    "public_key",
    "signature"
  ],
  "properties": {
    "schema": { "const": "agent-receipts/v1" },
    "id": { "type": "string", "pattern": "^rcpt_[a-z0-9]+$" },
    "vault_id": { "type": "string", "pattern": "^vlt_[a-z0-9]+$" },
    "sequence": { "type": "integer", "minimum": 1 },
    "issued_at": { "type": "string", "format": "date-time" },
    "action": {
      "type": "object",
      "required": ["type", "summary"],
      "properties": {
        "type": { "type": "string", "minLength": 1 },
        "summary": { "type": "string", "minLength": 1 },
        "actor": { "type": "string" },
        "principal": { "type": "string" },
        "context": { "type": "object", "additionalProperties": { "type": "string" } }
      },
      "additionalProperties": false
    },
    "payload_hash": {
      "oneOf": [{ "type": "null" }, { "type": "string", "pattern": "^sha256:[0-9a-f]{64}$" }]
    },
    "prev_receipt_hash": {
      "oneOf": [{ "type": "null" }, { "type": "string", "pattern": "^sha256:[0-9a-f]{64}$" }]
    },
    "key_id": { "type": "string", "pattern": "^key_[0-9a-f]{16}$" },
    "public_key": {
      "type": "string",
      "description": "Base64 SPKI DER encoding of the issuer's Ed25519 public key"
    },
    "signature": {
      "type": "string",
      "description": "Base64 Ed25519 signature over the JCS-canonical JSON of all fields except this one"
    }
  },
  "additionalProperties": false
}