{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573280801",
    "entityType": "Track",
    "nonce": "0x83b6f473de88e69064af3b4f958d411608759544f66471123ad0463f6adb8d62",
    "signature": "0xb3775334b3f01f0636257a1e4860ac933902b818ab98eed692c967d17c3f101810fc48a06725cf0b2f343da1e5101df4856b94fa50a90e0dd07d810ebb0a8f5f1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}