{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "657",
    "entityType": "User",
    "nonce": "0x6826058ce2399a84fe8ebdf52c92f01846c03ccc40e9009b961140bcd48930d3",
    "signature": "0x375e6e880c5054f5098fa97322987f20d2486d63b508d17eb254399a1a5866d54e8b8b7d3fb49074dc77b4b4f76ac7aa05e11979a8c9c80f7e1b911617b47b221c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}