{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "123645",
    "entityType": "User",
    "nonce": "0xf87f81d9b457e83a47af795aa4234be21de410ae8edf31f1ae9ae8b24b6a02d3",
    "signature": "0x8931fb61357c104e40428592c64173bea17c281085dd897eafbac3726b9670073fc1234dc4f28efaf660be7689ffdad61973fc1ad0f213dfc7fb2473d58919891c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}