{
  "manageEntity": {
    "action": "Save",
    "entityId": "20191812",
    "entityType": "Track",
    "nonce": "0x6573afe18af68815158802478c6afc95b08aa2e2b0d95d8654fec415cf6be148",
    "signature": "0x7629857f8dd3925807c175c26c2841eec384baa96308e1b1fca89f80ef34ab6535caede9f2a1048df7e1d231b3f9a7b03b3adc9623b1313ab44b271890ca88471c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}