{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "348321",
    "entityType": "User",
    "nonce": "0x57ef79a62efc99b220ccf60dc93629dda60aaefd929aa7f02f779597e1b8fe50",
    "signature": "0xd4a64f380066e4633cbcfcbe8dac6e2eeafccc52aefd5f34e3d5aaa9db63ebf87a5e8d156b3cd93d9ad295dbc91e264ca39df1eb956f0f0eb2b87cadd46238961b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}