{
  "manageEntity": {
    "action": "Save",
    "entityId": "374268061",
    "entityType": "Track",
    "nonce": "0x47ff0a6cb0bfb3f3f1d72f2cad64e970e943cb1e1c6c7ec254021da47c007375",
    "signature": "0x715c08aace3e2bc0c1c19290a202d7c2344e607a603a63638fe64c5a0b71dedd3fc3334dbdbe518f1505f25da381fb4f40248d8d9605d71e2ecf34497361ea821c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}