{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616374847",
    "entityType": "Track",
    "nonce": "0xe1bf2b28559c947a7782d695545541939982699cd764ed920ba5440dd73f009a",
    "signature": "0x5a9eff3bbf12e85d1753b74040fa8969c81e4599583efc7005cfe4f7b9b8254e2618a6e1c7ccd3da6db709318bafaedbcd7c592ab2b5ccf4291a294f1604e4d21b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}