{
  "manageEntity": {
    "action": "Save",
    "entityId": "2005708781",
    "entityType": "Track",
    "nonce": "0x87b7e38218863cdb482568086fefa39a28fec127af312e37897dd910bc6bc9ef",
    "signature": "0x789f3b405ae4a1c9f5ced32ba1ebe967f8ed7ecfd8d31fe008f1ec8fffe95d13019a6f247874cbdece6aa4f0671a2bb64c02503c25f36034934b5d5ac75d040e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}