{
  "manageEntity": {
    "action": "Save",
    "entityId": "1450973028",
    "entityType": "Track",
    "nonce": "0x78c2ee8a719be2106be5757d0fafde6514065ac0cf9b890e181d4005b617a1f8",
    "signature": "0xf02de9c13b5fe481e0cd10607371efe4e20ece9a9dd571516c4a2dab0111caf8314ceac6895f2026e703d139a90f43111dd4f8964a1a4252ebb7d8f83c3fb0ad1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}