{
  "manageEntity": {
    "action": "Save",
    "entityId": "301686778",
    "entityType": "Track",
    "nonce": "0x89363627137097757d82fdc0a8353d1a3ba26ff076c3b9cc3540d6dad1f66f46",
    "signature": "0xaf728adc8d06d657c4f986476298e7ceaf70749c7dbe731d120c0debbdf27525616fa122c63f6a9f85e44959879ef7d82c679ae3a2c2c6801f39f7e219704c781c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}