{
  "manageEntity": {
    "action": "Save",
    "entityId": "639758",
    "entityType": "Track",
    "nonce": "0x78281929cee7cf52811e20fed0b66cb049a849bd32fb4695d2449efe0c882a78",
    "signature": "0xb4ae6e0bb990f14169efea6db717507993f27d5c1d872a953b26cfe1415ccc27528cfd9f0d921e8aafca81a7e4b5f78de8751f0698598b7ca27e8e115f9ad1731c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}