{
  "manageEntity": {
    "action": "Save",
    "entityId": "1453845468",
    "entityType": "Track",
    "nonce": "0x3a9d8de7dc12a03d5b66fdee15eef8f3c5d29b3837b29864b6210a488d9d2b83",
    "signature": "0xc13e24374994248ba12b5ff991216fc4e7315bb2c3e426179173bd9615faee6e77e03a08d54bc25b74f28473a413e1a859fdd9460c47d0d09169990705f4b85c1b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}