{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://azzle.protocol/xmtp/envelope/v1",
  "title": "AzzleXmtpEnvelope",
  "type": "object",
  "required": [
    "schemaVersion",
    "type",
    "negotiationId",
    "sequence",
    "previousHash",
    "timestamp",
    "sender",
    "payload"
  ],
  "properties": {
    "schemaVersion": { "const": "azzle-xmtp-v1" },
    "type": { "type": "string", "minLength": 1 },
    "negotiationId": { "type": "string", "format": "uuid" },
    "taskId": { "type": "string" },
    "sequence": { "type": "integer", "minimum": 1 },
    "previousHash": { "type": "string", "pattern": "^0x[a-fA-F0-9]{64}$" },
    "timestamp": { "type": "string", "format": "date-time" },
    "sender": {
      "type": "object",
      "required": ["evmAddress", "xmtpPublicKey"],
      "properties": {
        "evmAddress": { "type": "string", "pattern": "^0x[a-fA-F0-9]{40}$" },
        "xmtpPublicKey": { "type": "string" }
      }
    },
    "payload": { "type": "object" }
  }
}