let signRequest =SignRequest()signRequest.message ="Messages that need to be signed, [it could be random which come from dapp server]"// DApp CallbackUrl// param:{"protocol": "", "version": "", "message": "", "sign": "", "ref": "", "account": ""}// return: same as SimpleWallet {"code": [0-2], "message": ""}signRequest.callbackUrl ="https://dappserver.xxx.url"MYKEYWallet.shared.sign(signRequest: signRequest, response: MYKEYResponse.init(success: { (response) in self.view.makeToast("success")}, failure: { (errorValue) in self.view.makeToast("failure")}, cancelled: { self.view.makeToast("cancelled")}))