{
  "manageEntity": {
    "action": "Save",
    "entityId": "819938668",
    "entityType": "Track",
    "nonce": "0xacc4bdf9d9396ce44397b6efb825324af0f5358b42592267739680ab9ff8b3a8",
    "signature": "0xe872120f835293327076aee87cb73fd44334d4040db462e3050f641fee984c676cc7f4127458b4867c520aa19b199839eda4d333499d7c29b48aa9c88eca241f1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}