{
  "manageEntity": {
    "action": "Save",
    "entityId": "1519789457",
    "entityType": "Track",
    "nonce": "0x226b0d6030c59458c328460daeee214e34b1b742a471fcf3888528843a4cf38c",
    "signature": "0x65e6ecfb1912ee8c573c1cda412bec503f1dd62000a0663a809e4977e38538803ef1fc0d9933ec832f49cbe60fb2c489436877d0e1d67e3768034f34733e6af11b",
    "signer": "0x11EFeB5E02d1E5FF95b12f694953DC15ACEc8bbB",
    "userId": "191130508"
  }
}