{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "54508",
    "entityType": "User",
    "nonce": "0x7207200117ffbd0fc82f84c526b52e23fb82c285915d7bbd466adf2b32088810",
    "signature": "0x0c1907cd43232a7ffb670a8e6607966915dd503fea0cfa8511a945715e3220cd63b69a949055657b9fd9e4a2626b4eabe2ea418c7bc9e42607c353d37880d72f1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}