{
  "manageEntity": {
    "action": "Save",
    "entityId": "186904051",
    "entityType": "Track",
    "nonce": "0x7f0a43e7ddb4a73c278e1be666cf6c12cd860ccf8801d6d9cfda7a8523fc503f",
    "signature": "0x15d4f11afff6cf797d7581a2898ba9515842417de17a982805aedf972e2e53c13751602cf584a9b44f6c3c9dfe196ba3c012edf91e63bd8ccf7ea52d736a9c4c1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}