{
  "manageEntity": {
    "action": "Save",
    "entityId": "643956167",
    "entityType": "Track",
    "nonce": "0x8b4c8ddafe7b8dd0930f234c7dff772986a1cdf7fab2c08441a9c6148910d9cc",
    "signature": "0x24899d7cb3b8ddc7cf2b7584878aea96ad48258e0968d9bcc71a7409df1df8ed318caa1d1c7b2f356e2bccc22a77be7d39bea2f209e119eafb25625d4b34d6ca1b",
    "signer": "0xE7A4a8f1d081B44C96Ed68610B6c3016ce8cD6E0",
    "userId": "464427506"
  }
}