{
  "manageEntity": {
    "action": "Save",
    "entityId": "1340801964",
    "entityType": "Track",
    "nonce": "0x7189b46305af1724039fdaa87a8726fa51d9699bb9d8ba29b51eedbff117802c",
    "signature": "0x8e460c8b43c3583e22d0ec9201faf29694bd78ce5c9f002a497b7d2d47d0979f51aa89017d03eed7189bab404de50ba707aedefdc1a98fb04d2329c57d2027891c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}