{
  "manageEntity": {
    "action": "Save",
    "entityId": "1493354891",
    "entityType": "Track",
    "nonce": "0xbbb6f4f9696307b110e7d46be7f714c0d4af262d1d6d4dbb95419807cefbde29",
    "signature": "0x0638897e4d1d9b65097de85b9541c6c70466a20e7a83f04038e1bba3bbebc280780dcc7d171feae0ffab012db13a6c4deaabcb113cf26de8f57948bcb1176b0b1c",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}