{
  "manageEntity": {
    "action": "Save",
    "entityId": "1612918640",
    "entityType": "Track",
    "nonce": "0xe049cacac7711a4898fc0769bc9d2a3bb668ec0060d8dc3db4d45279eb4cee2b",
    "signature": "0xb2c7773567fc7f59e7852f0997767d2b4fef6637086e6e4ca7c835612fd29a354bbb068bda9a5c0693dfbad238d70efc03e894546780f5bf5faaf1e8acb7cade1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}