{
  "manageEntity": {
    "action": "Save",
    "entityId": "540978066",
    "entityType": "Track",
    "nonce": "0x014e3dca4b48a143245aa188ea2eb27953ab6e4ee284005569c477f85d1633a0",
    "signature": "0x87cffc2a7a182f316c818e625939cd3fcfdbf428c66f2bab8b7d026d49626f4c05bd67c319bf571834278c729b25b6e97762a8a94aa3a715ec7d45a12433040b1b",
    "signer": "0x306495Aa3660C22f1D9875eb0dE750B688de5746",
    "userId": "1885753"
  }
}