{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "123",
    "entityType": "User",
    "nonce": "0xcb99a973ab9622f7ddb6e869f3527cd75baf201496aacbfaf13994df4d7032fb",
    "signature": "0xa16bb53964aced00463b56ace88e9dcc4c693d9a7c820c66516bd3c5cf131dd602c5d1aa6e660ab9e9db81cad9814e74f9fdc0fc5464f08b8b3e5d81e6f589fd1b",
    "signer": "0x07691D0C34E03020A13BE4B5a411B64CcFff5556",
    "userId": "9014"
  }
}