{
  "manageEntity": {
    "action": "Save",
    "entityId": "540656",
    "entityType": "Track",
    "nonce": "0x84962b815443f439d31729d04a42ba7be4eb06acbf6002167785dbca5d24a5e6",
    "signature": "0x81490f2aac6d44f5b098bacfcf09d72f7332138548819a632ac4381b4bd38ca772e11ef0e9519004edda2da5b792256952f70fa21f01db4fdefb2cc0f48b81be1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}