{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900901343",
    "entityType": "Track",
    "nonce": "0x95a1884a44a3f504c0bb6acb76053dc8c5898609977b21293a0cda0b760a4e35",
    "signature": "0x8a201283d273ff198941d0f2e82f08c7e0cb790d8d7ac409168f9de6b1aef10a43cb0e794bf5a82cf2016b217b201bfc765cbd85070ebd6165921e188d2e47ad1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}