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C# Bitcoin tutorial based on Mixin Network: Receive and send Bitcoin in Mixin Messenger

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Mixin Network
Published
2022/04/29
Updated
2019/05/25
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C# Bitcoin tutorial based on Mixin Network: Receive and send Bitcoin in Mixin Messenger

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In the previous chapter, we created our first app, when user sends "Hello,world!", the bot reply the same message.

Program.cs

using System;
using System.Collections.Generic;
using MixinSdk;
using MixinSdk.Bean;
using Newtonsoft.Json;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Prng;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;

namespace echo_bot
{
    class Program
    {
        static void Main(string[] args)
        {
            MixinApi mixinApi = new MixinApi();
            mixinApi.Init(USRCONFIG.ClientId, USRCONFIG.ClientSecret, USRCONFIG.SessionId, USRCONFIG.PinToken, USRCONFIG.PrivateKey);


            mixinApi.WebSocketConnect(HandleOnRecivedMessage).Wait();

            mixinApi.StartRecive();

            do
            {
                var msg = Console.ReadLine();


            } while (true);

        }


        static void HandleOnRecivedMessage(object sender, EventArgs args, string message)
        {
            var incomingMessage = JsonConvert.DeserializeObject<RecvWebSocketMessage>(message);
            Console.WriteLine(incomingMessage);
            if ( (incomingMessage.action == "CREATE_MESSAGE") && (incomingMessage.data != null) ) {
                // Console.WriteLine(incomingMessage.data.conversation_id);
                MixinApi callback = (MixinApi)sender;
                //send ack for every Create Message!
                callback.SendMessageResponse(incomingMessage.data.message_id).Wait();
                if (incomingMessage.data.category == "PLAIN_TEXT") {
                  byte[] strOriginal = Convert.FromBase64String(incomingMessage.data.data);
                  string clearText = System.Text.Encoding.UTF8.GetString(strOriginal);
                  Console.WriteLine(clearText);
                  string thisMessageId = Guid.NewGuid().ToString();
                  System.Console.WriteLine("Send echo with message id:" + thisMessageId);
                  if (clearText == "a") {
                    AppCard appCard      = new AppCard();
                    appCard.title        = "Pay BTC 0.0001";
                    appCard.icon_url     = "https://images.mixin.one/HvYGJsV5TGeZ-X9Ek3FEQohQZ3fE9LBEBGcOcn4c4BNHovP4fW4YB97Dg5LcXoQ1hUjMEgjbl1DPlKg1TW7kK6XP=s128";
                    appCard.description  = "hi";
                    appCard.action       = "https://mixin.one/pay?recipient=" +
                                                           USRCONFIG.ClientId  + "&asset=" +
                                                           "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
                                                           "&amount=" + "0.001" +
                                                           "&trace="  + System.Guid.NewGuid().ToString() +
                                                           "&memo=";
                    callback.SendAppCardMessage(incomingMessage.data.conversation_id,appCard);
                  } else if (clearText == "g") {
                    List<AppButton> appBtnList = new List<AppButton>();
                    string payLinkEOS = "https://mixin.one/pay?recipient=" +
                                                     USRCONFIG.ClientId  + "&asset=" +
                                                     "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"   +
                                                     "&amount=" + "0.1" +
                                                     "&trace="  + System.Guid.NewGuid().ToString() +
                                                     "&memo=";
                        string payLinkBTC = "https://mixin.one/pay?recipient=" +
                                                     USRCONFIG.ClientId  + "&asset=" +
                                                     "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
                                                     "&amount=" + "0.001" +
                                                     "&trace="  + System.Guid.NewGuid().ToString() +
                                                     "&memo=";
                    AppButton btnBTC = new AppButton();
                    btnBTC.label     = "Pay BTC 0.001";
                    btnBTC.color     = "#0080FF";
                    btnBTC.action    = payLinkBTC;

                    AppButton btnEOS = new AppButton();
                    btnEOS.label     = "Pay EOS 0.1";
                    btnEOS.color     = "#8000FF";
                    btnEOS.action    = payLinkEOS;
                    appBtnList.Add(btnBTC);
                    appBtnList.Add(btnEOS);
                          callback.SendAppButtonGroupMessage(incomingMessage.data.conversation_id,appBtnList);
                  } else  callback.SendTextMessage(incomingMessage.data.conversation_id, clearText,thisMessageId);

                }
                if (incomingMessage.data.category == "SYSTEM_ACCOUNT_SNAPSHOT") {
                  byte[] strOriginal = Convert.FromBase64String(incomingMessage.data.data);
                  string clearText = System.Text.Encoding.UTF8.GetString(strOriginal);
                  Console.WriteLine(clearText);
                  Transfer trsInfo = JsonConvert.DeserializeObject<Transfer>(clearText);
                  Console.WriteLine(trsInfo.asset_id);
                  Console.WriteLine(trsInfo.opponent_id);
                  Console.WriteLine(trsInfo.amount);

                  Transfer reqInfo = callback.Transfer(trsInfo.asset_id,
                                                      trsInfo.opponent_id,
                                                      trsInfo.amount,
                                                      USRCONFIG.PinCode,
                                                      System.Guid.NewGuid().ToString(),
                                                      "");
                  Console.WriteLine(reqInfo);
                }
            }
            // Console.WriteLine(incomingMessage);
            if (incomingMessage.action == "ACKNOWLEDGE_MESSAGE_RECEIPT")
            {
                if (incomingMessage.data != null) {
                  System.Console.WriteLine("The message delivery status: " +
                                            incomingMessage.data.message_id + " "
                                            + incomingMessage.data.status);
                }
            }
            if (incomingMessage.action == "LIST_PENDING_MESSAGES")
            {
                System.Console.WriteLine("The bot is listening!");
            }
        }

    }
}

Hello Bitcoin!

Build and execute in the project directory.

  • dot build build the project.
  • dotnet bin/Debug/netcoreapp2.0/echo_bot.dll run it.
wenewzha:echo_bot wenewzhang$ dotnet build
Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 154.16 ms for /Users/wenewzhang/Documents/sl/mixin_labs-csharp-bot/echo_bot/echo_bot.csproj.
  Restore completed in 154.19 ms for /Users/wenewzhang/Documents/sl/mixin_labs-csharp-bot/mixin-csharp-sdk/mixin-csharp-sdk/mixin-csharp-sdk.csproj.
  mixin-csharp-sdk -> /Users/wenewzhang/Documents/sl/mixin_labs-csharp-bot/mixin-csharp-sdk/mixin-csharp-sdk/bin/Debug/netstandard2.0/mixin-csharp-sdk.dll
  Created package at /Users/wenewzhang/Documents/sl/mixin_labs-csharp-bot/mixin-csharp-sdk/mixin-csharp-sdk/bin/Debug/MixinCSharpSdk.0.1.0.nupkg.
  echo_bot -> /Users/wenewzhang/Documents/sl/mixin_labs-csharp-bot/echo_bot/bin/Debug/netcoreapp2.0/echo_bot.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:03.33
wenewzha:echo_bot wenewzhang$ dotnet bin/Debug/netcoreapp2.0/echo_bot.dll

{"id":"dd52dfe5-7f12-4c0e-bb44-d1865308e628","action":"LIST_PENDING_MESSAGES","data":null}
The bot is listening!

Developer can send Bitcoin to their bots in message panel. The bot receive the Bitcoin and then send back immediately. transfer and tokens

User can pay 0.001 Bitcoin to bot by click the button and the 0.001 Bitcoin will be refunded in 1 second,In fact, user can pay any coin either. pay-link

Source code summary

  if (incomingMessage.data.category == "SYSTEM_ACCOUNT_SNAPSHOT") {
    byte[] strOriginal = Convert.FromBase64String(incomingMessage.data.data);
    string clearText = System.Text.Encoding.UTF8.GetString(strOriginal);
    Transfer trsInfo = JsonConvert.DeserializeObject<Transfer>(clearText);
  if ( Int32.Parse(trsInfo.amount) > 0 ) {
    Transfer reqInfo = callback.Transfer(trsInfo.asset_id,
                                        trsInfo.opponent_id,
                                        trsInfo.amount,
                                        USRCONFIG.PinCode,
                                        System.Guid.NewGuid().ToString(),
                                        "");
    Console.WriteLine(reqInfo);
  }
  • trsInfo.amount is negative if bot sends Bitcoin to user successfully.
  • trsInfo.amount is positive if bot receive Bitcoin from user. Call callback.Transfer to refund the coins back to user.

Advanced usage

APP_BUTTON_GROUP

In some payment scenario, for example: The coin exchange provides coin-exchange service which transfer BTC to EOS ETH, BCH etc, you want show the clients many pay links with different amount, APP_BUTTON_GROUP can help you here.

  List<AppButton> appBtnList = new List<AppButton>();
  string payLinkEOS = "https://mixin.one/pay?recipient=" +
                     USRCONFIG.ClientId  + "&asset=" +
                     "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"   +
                     "&amount=" + "0.1" +
                     "&trace="  + System.Guid.NewGuid().ToString() +
                     "&memo=";
  string payLinkBTC = "https://mixin.one/pay?recipient=" +
                     USRCONFIG.ClientId  + "&asset=" +
                     "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
                     "&amount=" + "0.001" +
                     "&trace="  + System.Guid.NewGuid().ToString() +
                     "&memo=";
  AppButton btnBTC = new AppButton();
  btnBTC.label     = "Pay BTC 0.001";
  btnBTC.color     = "#0080FF";
  btnBTC.action    = payLinkBTC;

  AppButton btnEOS = new AppButton();
  btnEOS.label     = "Pay EOS 0.1";
  btnEOS.color     = "#8000FF";
  btnEOS.action    = payLinkEOS;
  appBtnList.Add(btnBTC);
  appBtnList.Add(btnEOS);
  callback.SendAppButtonGroupMessage(incomingMessage.data.conversation_id,appBtnList);

Here show clients two buttons for EOS and BTC, you can add more buttons in this way.

APP_CARD

Maybe a group of buttons too simple for you, try a pay link which show a icon: APP_CARD.

  AppCard appCard      = new AppCard();
  appCard.title        = "Pay BTC 0.0001";
  appCard.icon_url     = "https://images.mixin.one/HvYGJsV5TGeZ-X9Ek3FEQohQZ3fE9LBEBGcOcn4c4BNHovP4fW4YB97Dg5LcXoQ1hUjMEgjbl1DPlKg1TW7kK6XP=s128";
  appCard.description  = "hi";
  appCard.action       = "https://mixin.one/pay?recipient=" +
                           USRCONFIG.ClientId  + "&asset=" +
                           "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
                           "&amount=" + "0.001" +
                           "&trace="  + System.Guid.NewGuid().ToString() +
                           "&memo=";
  callback.SendAppCardMessage(incomingMessage.data.conversation_id,appCard);

APP_CARD

Full code is here

How to create a Bitcoin wallet based on Mixin Network API

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