{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "3407",
    "entityType": "User",
    "nonce": "0x3e281f892dbeffc1f2cb876ba335d262d8cd4070537da7900e82fc2b721f0319",
    "signature": "0x375c02749135b5f9d9fb73eaacee8a8825450cab70da0e9168c0f82093d53cee6b397050b2f45eaf5761f57bc7be9201075616cda8d56fb5d6c90d11f6da99c71b",
    "signer": "0x1523dBDd49A653271BD1F378eF3fc77B20b4f2C1",
    "userId": "315268152"
  }
}