{
  "manageEntity": {
    "action": "Save",
    "entityId": "472911841",
    "entityType": "Track",
    "nonce": "0x24573836c69f92359fbecce8aec35c4787d030e27176e28f39fc1422eae2c70a",
    "signature": "0x6583dfdb6cfddbbe655667066d11c156f749ad2be1f3eaed9af41948cc57a42143dba2cad331aef987637d3e37d93d52254f69033726464a4715a31e4c4f060b1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}