{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x990ec3928a567c884f95967db9ef99eef765507dc015bb08a5f183be85487112",
    "signature": "0xbc963244b96eabb87ce7f2c89342616696d44d4926d1a1404c4a42c67e1ee89d0dd7747af165da90c86d21e4a314dda22f5cf551cb30a16b9e98d71032ca8da81c",
    "signer": "0x5Af531A9cDF9747df40f57531227d70F1bdD2ed7",
    "userId": "511108744"
  }
}