{
  "manageEntity": {
    "action": "Save",
    "entityId": "1225783773",
    "entityType": "Track",
    "nonce": "0x59a9fb712aab6690109260077dcefc03e7b650a6ca7bc67bbcc2c4dbe688c5c8",
    "signature": "0x8211100cba2b8700c45e1bcd6d73582b2ab10ef769f439aec9a78bb3aaaa9ce21334b8f4d66a7cf729c35e833681a3cd8765312398dd6481268d58b5e83f06881c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}