{
  "manageEntity": {
    "action": "Save",
    "entityId": "354463894",
    "entityType": "Track",
    "nonce": "0xd371f51fd87ed089c5223e9c508dffb5d719d7140784fdd471f41892fc8746c6",
    "signature": "0xe6f1d31c61171f981e446f6ad8b79d7d1147c7326c6ac435962b764dd1a471fd4c859c6a4fd7b616b9faae28939c968a96d475e81a6d9c3d03533293ab6814071b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}