{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "540529323",
    "entityType": "User",
    "nonce": "0x40b4b99ce1eb7d53ae49e3bffd661ab5dd14721df4623e3c223be5ccb1147359",
    "signature": "0xf6516c3dd5d75930dd0b0514c63cb32973b954992340820c1cf365e34d8eb538513fae345e70be31f3d5177f446f93b408f6da70c3dcb3c2447c4f995cb91a781c",
    "signer": "0xa603e9487Ed7C3C62E8acb85f8f32acFf5d6349b",
    "userId": "278135553"
  }
}