{
  "manageEntity": {
    "action": "Save",
    "entityId": "613188396",
    "entityType": "Track",
    "nonce": "0x2f85c3fd246b2a6a5566f3ef00e2fc4cb5ba774c4cc053f1e784ee257f9dc0e4",
    "signature": "0x9a2fe14ee51820d81f332d2a6c372d13f5d266434def5534f0bba63553d7bb7d25ca3fec79a393b160618943b4396e9fbc0a5cd138f5157ce8ec2d03e7be86a21b",
    "signer": "0x5D4848bCf5c4abA1a0Fdf2B61408c9e4288aDb0E",
    "userId": "305415280"
  }
}