{
  "manageEntity": {
    "action": "Save",
    "entityId": "535340650",
    "entityType": "Track",
    "nonce": "0xdd31d67503e57adb17138207a6af1282a9373bf0a54eee3bec3253111cfc51bb",
    "signature": "0x94cb6fb0da0120c1aad38951ec674bca1b790e8b9b342c6a13cdfb428b6233523fb822f08673b58223306023b6ed18800b9faef1589e81fe98dcdc8d153d3a171b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}