{
  "manageEntity": {
    "action": "Save",
    "entityId": "671602395",
    "entityType": "Track",
    "nonce": "0x133d4a8da2bffee0591a2612590a7530bd1397e7016f9bdcfc8d1d322be58f36",
    "signature": "0xa914159073abc55dfc1c4b9d0e787feecabbb687eef9fd259abbbd4d6307310668d18c408cca86aece7ec18bbcd6e7eeb91e44028213be7c269f0c32133ceb931c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}