{
  "manageEntity": {
    "action": "Save",
    "entityId": "515346915",
    "entityType": "Track",
    "nonce": "0x75fae09ca1a8780d040810e4b103de8d13c7792819504ad901e96729adf5cc39",
    "signature": "0x042e082aceb55ba52f6e23065788eb36cf3fcdf47b30f8244fcd2cee66cbad3142d4ad9c99b9dabe66023b62ef4e8f2dc7db4b2d8a7f4d5dfbf110cb991490b01c",
    "signer": "0x5A6DCd6E22135e4225594900c17114A7dAD01964",
    "userId": "580576096"
  }
}