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")
}))