上一章介绍了 Exincore，你可以 1 秒完成资产的市价买卖。如果你想限定价格买卖，或者买卖一些 exincore 不支持的资产，你需要 OceanOne。

方案二: 在去中心化交易所 OceanOne 上挂单买卖 Bitcoin

Ocean.one 是基于 Mixin Network 的去中心化交易所，它性能一流。
你可以在 OceanOne 上交易任何资产，只需要将你的币转给 OceanOne, 将交易信息写在交易的 memo 里，OceanOne 会在市场里列出你的交易需求，
交易成功后，会将目标币转入到你的 MixinNetwork 帐上，它有三大特点与优势：

• 不需要在 OceanOne 注册
• 不需要存币到交易所
• 支持所有 Mixin Network 上能够转账的资产，所有的 ERC20 EOS 代币。

预备知识:

你先需要创建一个机器人, 方法在 教程一.

安装依赖包

我们需要依赖 MsgPack.Cli and mixin-csharp-sdk , 第四章 已经做过介绍, 你应该先安装过它了.

充币到 Mixin Network, 并读出它的余额.

此处演示用 USDT 购买 BTC 或者 用 BTC 购买 USDT。交易前，先检查一下钱包地址。
完整的步骤如下:

• 检查比特币或 USDT 的余额，钱包地址。并记下钱包地址。
• 从第三方交易所或者你的冷钱包中，将币充到上述钱包地址。
• 再检查一下币的余额，看到帐与否。(比特币的到帐时间是 5 个区块的高度，约 100 分钟)。

比特币与 USDT 的充值地址是一样的。

if (cmd == "aw") {// Console.WriteLine(mixinApi.VerifyPIN(USRCONFIG.PinCode.ToString()).ToString());
    MixinApi mixinApiNewUser = GetWalletSDK();
    var assets = mixinApiNewUser.ReadAssets();
    string wuuid = GetWalletUUID();
    Console.WriteLine("Current wallet uuid is" + wuuid);
    foreach (Asset asset in assets)
    {if (asset.symbol == "EOS") {
       Console.WriteLine(asset.symbol + "Public Address is:" +
                         asset.account_name + " " +
                         asset.account_tag +
                         "Balance is:" + asset.balance);
     } else Console.WriteLine(asset.symbol + "Public Address is:" +
                              asset.public_key + "Balance is:" +
                              asset.balance);
    Console.WriteLine();}
}

取得 Ocean.one 的市场价格信息

如何来查询 Ocean.one 市场的价格信息呢？你要先了解你交易的基础币是什么，如果你想买比特币，卖出 USDT, 那么基础货币就是 USDT; 如果你想买 USDT, 卖出比特币，那么基础货币就是比特币.

public class MarketInfoOcean
{public Omarket data { get; set;}
}
public class Omarket {public string market { get; set;}
  public string timestamp  {get; set;}
  public Side data {get; set;}
}
public class Side {public List<order> asks  { get; set;}
  public List<order> bids  {get; set;}
}
public class order {public string amount { get; set;}
  public string funds {get; set;}
  public string price {get; set;}
  public string side {get; set;}
}

if (cmdo == "1") {string jsonData = FetchOceanMarketPrice(USRCONFIG.XIN_ASSET_ID,USRCONFIG.ASSET_ID_USDT);
  // string jsonData = FetchMarketPrice("c6d0c728-2624-429b-8e0d-d9d19b6592fa");
  var marketObj = JsonConvert.DeserializeObject<MarketInfoOcean>(jsonData);
  Console.WriteLine("--Price--Amount---Funds---Side----");
  foreach (order value in marketObj.data.data.asks)
  {Console.WriteLine(value.price + "" + value.amount +" "+ value.funds +" " + value.side);
  }
  foreach (order value in marketObj.data.data.bids)
  {Console.WriteLine(value.price + "" + value.amount +" "+ value.funds +" " + value.side);
  }
}
public static string FetchOceanMarketPrice(string asset_id, string base_asset)
{return FetchOceanMarketPriceAsync(asset_id,base_asset).Result;
}
public static async Task<string> FetchOceanMarketPriceAsync(string asset_id, string base_asset)
{HttpClient client = new HttpClient();
  string baseUrl = "https://events.ocean.one/markets/" + asset_id + "-" + base_asset + "/book";
  try
  {HttpResponseMessage response = await client.GetAsync(baseUrl);
     response.EnsureSuccessStatusCode();
     string responseBody = await response.Content.ReadAsStringAsync();
     // Above three lines can be replaced with new helper method below
     // string responseBody = await client.GetStringAsync(uri);
     Console.WriteLine(responseBody);
     return responseBody;
  }
  catch(HttpRequestException e)
  {Console.WriteLine("\nException Caught!");
     Console.WriteLine("Message :{0}",e.Message);
  }
  return null;
}

交易前，创建一个 Memo!

在第二章里, 基于 Mixin Network 的 C# 比特币开发教程: 机器人接受比特币并立即退还用户, 我们学习过转帐，这儿我们介绍如何告诉 Ocean.one，我们给它转帐的目的是什么，信息全部放在 memo 里.

• Side 方向,”B” 或者 “A”, “B” 是购买, “A” 是出售.
• AssetUuid 目标虚拟资产的 UUID.
• Price 价格，如果操作方向是 ”B”, 价格就是 AssetUUID 的价格; 如果操作方向是 ”B”, 价格就是转给 Ocean.one 币的价格.

private static string GenerateOrderMemo(string Side, string AssetUuid, string Price) {Hashtable temp = new Hashtable();
  temp.Add("S","A");
  temp.Add("A",StringGuid2Bytes(AssetUuid));
  temp.Add("P",Price);
  temp.Add("T","L");
  var serializer3 = MessagePackSerializer.Get<Hashtable>();
  var stream3 = new MemoryStream();
  serializer3.Pack(stream3, temp);
  string memo = Convert.ToBase64String(stream3.ToArray());
  return memo;
}

买入 XIN 的代码如下：

public static string  OCEANONE_BOT   = "aaff5bef-42fb-4c9f-90e0-29f69176b7d4";
public static string  ASSET_ID_BTC   = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";
public static string  ASSET_ID_EOS   = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";
public static string  ASSET_ID_USDT  = "815b0b1a-2764-3736-8faa-42d694fa620a";

public static string  XIN_ASSET_ID   = "c94ac88f-4671-3976-b60a-09064f1811e8";

if (cmdo == "b1") {Console.WriteLine("Please input the price of XIN/USDT:");
  var pinput = Console.ReadLine();
  Console.WriteLine("Please input the amount of USDT:");
  var ainput = Console.ReadLine();

  string memo = GenerateOrderMemo("A",USRCONFIG.ASSET_ID_USDT,pinput);
  Console.WriteLine(memo);
  MixinApi mixinApiNewUser = GetWalletSDK();
  var assets = mixinApiNewUser.ReadAsset(USRCONFIG.ASSET_ID_USDT);
  Console.WriteLine(assets.balance);
  float balance = float.Parse(assets.balance);
  float amount  = float.Parse(ainput);
  if (( balance >= 1.0) && (balance >= amount) ) {
    Transfer reqInfo = mixinApiNewUser.Transfer(USRCONFIG.ASSET_ID_USDT,
                            USRCONFIG.OCEANONE_BOT,
                            ainput,
                            GetWalletPinCode(),
                            System.Guid.NewGuid().ToString(),
                            memo);
    Console.WriteLine(reqInfo);
    Console.WriteLine("Order id is" + reqInfo.trace_id);
  } else Console.WriteLine("Not enough USDT!");
}

出售 XIN 的例子

转打算出售的 XIN 给 Ocean.one(OCEANONE_BOT), 将你打算换回来的目标虚拟资产的 UUID 放入 memo.

if (cmdo == "s1") {Console.WriteLine("Please input the price of XIN/USDT:");
  var pinput = Console.ReadLine();
  Console.WriteLine("Please input the amount of XIN:");
  var ainput = Console.ReadLine();
  string memo = GenerateOrderMemo("B",USRCONFIG.XIN_ASSET_ID,pinput);
  Console.WriteLine(memo);
  // Console.WriteLine(Convert.ToBase64String(stream3.ToArray()));
  MixinApi mixinApiNewUser = GetWalletSDK();
  var assets = mixinApiNewUser.ReadAsset(USRCONFIG.XIN_ASSET_ID);
  float balance = float.Parse(assets.balance);
  float amount  = float.Parse(ainput);
  if (( balance >= 0) && (balance >= amount) ) {
    Transfer reqInfo = mixinApiNewUser.Transfer(USRCONFIG.XIN_ASSET_ID,
                            USRCONFIG.OCEANONE_BOT,
                            ainput,
                            GetWalletPinCode(),
                            System.Guid.NewGuid().ToString(),
                            memo);
    Console.WriteLine(reqInfo);
    Console.WriteLine("Order id is" + reqInfo.trace_id);
  } else Console.WriteLine("Not enough XIN!");
}

一个成功的挂单如下：

Please input the price of XIN/USDT:
110
Please input the amount of USDT:
1
hKFBxBDJSsiPRnE5drYKCQZPGBHooVShTKFToUKhUKMxMTA=
1
{"type":"transfer","snapshot_id":"fe04c667-3ad9-4f2b-b205-ba2cef3733ea",
"opponent_id":"aaff5bef-42fb-4c9f-90e0-29f69176b7d4",
"asset_id":"815b0b1a-2764-3736-8faa-42d694fa620a","amount":"-1",
"trace_id":"12cd76aa-e953-4897-bef0-18123a5e69dc",
"memo":"hKFBxBDJSsiPRnE5drYKCQZPGBHooVShTKFToUKhUKMxMTA=",
"created_at":"2019-05-06T06:43:13.488971627Z"}
Order id is 12cd76aa-e953-4897-bef0-18123a5e69dc

取消挂单

Ocean.one 将 trace_id 当做订单，比如上面的例子，12cd76aa-e953-4897-bef0-18123a5e69dc 就是订单号，我们用他来取消订单。

if (cmdo == "c") {Console.WriteLine("Please input the Order id:");
  var oinput = Console.ReadLine();
  Hashtable temp = new Hashtable();
  temp.Add("O",StringGuid2Bytes(oinput));
  var serializer3 = MessagePackSerializer.Get<Hashtable>();
  var stream3 = new MemoryStream();
  serializer3.Pack(stream3, temp);
  string memo = Convert.ToBase64String(stream3.ToArray());
  MixinApi mixinApiNewUser = GetWalletSDK();
  var assets = mixinApiNewUser.ReadAsset(USRCONFIG.CNB_ASSET_ID);
  Console.WriteLine(assets.balance);
  float balance = float.Parse(assets.balance);
  if (balance >= 0) {
    Transfer reqInfo = mixinApiNewUser.Transfer(USRCONFIG.CNB_ASSET_ID,
                            USRCONFIG.OCEANONE_BOT,
                            "0.0000001",
                            GetWalletPinCode(),
                            System.Guid.NewGuid().ToString(),
                            memo);
    Console.WriteLine(reqInfo);
  } else Console.WriteLine("Not enough CNB!");
  }

通过读取资产余额，来确认到帐情况

MixinApi mixinApiNewUser = GetWalletSDK();
var assets = mixinApiNewUser.ReadAssets();

源代码执行

编译执行，即可开始交易了.

源代码执行

编译执行，即可开始交易了.

• [x] dotnet build 编译项目.
• [x] dotnet bin/Debug/netcoreapp2.2/bitcoin_wallet.dll 运行它.

本代码执行时的命令列表:

Commands list of this source code:

• 1: Create Bitcoin Wallet and update PIN
• 2: Read Bitcoin balance & address
• 3: Read USDT balance & address
• 4: Read EOS balance & address
• tub: Transfer USDT from Bot to Wallet
• tum: Transfer USDT from Wallet to Master
• tcb: Transfer CNB from Bot to Wallet
• tcm: Transfer CNB from Wallet to Master
• txb: Transfer XIN from Bot to Wallet
• txm: Transfer XIN from Wallet to Master
• 5: pay 0.0001 BTC buy USDT
• 6: pay $1 USDT buy BTC
• 7: Read Snapshots
• 8: Fetch market price(USDT)
• 9: Fetch market price(BTC)
• v: Verify Wallet Pin
• ab: Read Bot Assets
• aw: Read Wallet Assets
• o: OceanOne Trading
• q: Exit

Make your choose:

Make your choose(eg: q for Exit!):

Make your choose:
o

• 1: Fetch XIN/USDT orders
• s1: Sell XIN/USDT
• b1: Buy XIN/USDT
• 2: Fetch ERC20(Benz)/USDT orders
• s2: Sell Benz/USDT
• b2: Buy Benz/USDT
• c: Cancel Order
• q: Exit

完整代码