{
  "manageEntity": {
    "action": "Save",
    "entityId": "1583013115",
    "entityType": "Track",
    "nonce": "0x6ff0bb741be67cf9a4af392bd97946d4b7fe8a25cbea253ae5899631d5e5e33c",
    "signature": "0x03a6951b3de496eb2f92d79a915fb3b31e268eb04b005cc70c09d493f99eafaa7df11dd322a9753e327123dba5a2c6a56fabd9c8a559105801850e14b8747dbc1b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}