{
  "manageEntity": {
    "action": "Save",
    "entityId": "1637136909",
    "entityType": "Track",
    "nonce": "0x3820b9f3253eeed5fd4f996dbbb8469d51a67cfcbf4a9927fcd50555ee300d2a",
    "signature": "0x29d514faecb29fc1e4acfd63cfc027b328af2de8def79dd530d0c6c7aef982182d06873d660460368e6c0836dfedfaa85330000cb49a0e8edfe0e0ba5752873f1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}