{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "999548897",
    "entityType": "User",
    "nonce": "0x9686675f185563cda0af54a3ce0ab9e82aef6532f5e341e24250588f5f2189db",
    "signature": "0x8d5cc7e5c9d67cc4c55869678afb543714b05c147be412637ca2024df39b7a09291bddfefc6046f2f8d7e13166781c52ee28fdca66b6242282152ae773321fa51b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}