{
  "manageEntity": {
    "action": "Save",
    "entityId": "40449977",
    "entityType": "Track",
    "nonce": "0x794f48d518c9f1031bcd061323f389ce95f31e0a4ca23bd7cca7bc7094544b2e",
    "signature": "0x00b1b803341a20a72f1da2f862af557d9abb2f98688a10736afa6fd016fe699e61456d033f6788aecdea9b5596f6ad7329d0f1ddd5bfe6b4f71be53244e38fa61c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}