{
  "manageEntity": {
    "action": "Save",
    "entityId": "639285215",
    "entityType": "Track",
    "nonce": "0x29eabf9a7ff2a21925d1bdbff08b90ee368aa7d83e9ab9a848aa8bfd67b05c7b",
    "signature": "0x0a9c244dd25c80c19462193e77bd07008f57835e1ccaf14bd3db94f3706ec84874ac7fe9487974a184b6b31ff479bd8747bf88e886a5f627b601ff1a956cf60d1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}