{
  "manageEntity": {
    "action": "Save",
    "entityId": "25351336",
    "entityType": "Track",
    "nonce": "0x3e2d4790a4cc036de52e0449ae14cc07532c44e54e804d14e7913ec1095956ae",
    "signature": "0x471cd3493a076143c0309a5a6f60751fa4fd787e6bd26b1f53250f8a8d23f01a26466c152cf632a67496a8845369fbad13b921e92ab2f52bddd23f4526f18ea31c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}