摘要：方案二掛單交易所是基于的去中心化交易所，它性能一流。完整的步驟如下檢查比特幣或的余額，錢包地址。比特幣的到帳時間是個區塊的高度，約分鐘。

上一章介紹了Exincore，你可以1秒完成資產的市價買賣。如果你想限定價格買賣，或者買賣一些exincore不支持的資產，你需要OceanOne。

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上交易任何資產，只需要將你的幣轉給OceanOne, 將交易信息寫在交易的memo里，OceanOne會在市場里列出你的交易需求，
交易成功后，會將目標幣轉入到你的MixinNetwork帳上，它有三大特點與優勢：

不需要在OceanOne注冊

不需要存幣到交易所

支持所有Mixin Network上能夠轉賬的資產，所有的ERC20 EOS代幣。

你先需要創建一個機器人, 方法在 教程一.

我們需要依賴 msgpack and mixin-bot ,第四章 已經做過介紹, 你應該先安裝過它了.

此處演示用 USDT購買BTC 或者 用BTC購買USDT。交易前，先檢查一下錢包地址。
完整的步驟如下:

檢查比特幣或USDT的余額，錢包地址。并記下錢包地址。

從第三方交易所或者你的冷錢包中，將幣充到上述錢包地址。

再檢查一下幣的余額，看到帳與否。(比特幣的到帳時間是5個區塊的高度，約100分鐘)。

比特幣與USDT的充值地址是一樣的。

if cmd == "aw"
  assetsInfo = walletAccount.read_assets()
  p "--------The Wallet Assets List-----------------"
  assetsInfo["data"].each { |x| puts x["symbol"] + " " +
                              x["balance"] + " " + x["public_key"] +
                              x["account_name"] + " " + x["account_tag"]}
  p "----------End of Wallet Assets --------------"
end

如何來查詢Ocean.one市場的價格信息呢？你要先了解你交易的基礎幣是什么，如果你想買比特幣，賣出USDT,那么基礎貨幣就是USDT;如果你想買USDT,賣出比特幣，那么基礎貨幣就是比特幣.

if ocmd == "1"
  Utils.OceanOneMarketPriceRequest(BTC_ASSET_ID, USDT_ASSET_ID)
end
def self.OceanOneMarketPriceRequest(asset_id, base_asset_id)
   full_url = "https://events.ocean.one/markets/" + asset_id + "-" + base_asset_id + "/book"
   data = HTTP.get(full_url).body
   body = ""
   redData = data.readpartial
   while  redData != nil
     body = body + redData
     redData = data.readpartial
   end
   result = ActiveSupport::JSON.decode(body).with_indifferent_access
   result["data"]["data"]["asks"].each { |x|
                                          puts x["side"] + " " + x["price"] + " " +
                                          x["amount"] + " " + x["funds"]
                                        }
   result["data"]["data"]["bids"].each { |x|
                                          puts x["side"] + " " + x["price"] + " " +
                                          x["amount"] + " " + x["funds"]
                                        }
end

在第二章里,Ruby比特幣開發教程: 機器人接受比特幣并立即退還用戶, 我們學習過轉帳，這兒我們介紹如何告訴Ocean.one，我們給它轉帳的目的是什么，信息全部放在memo里.

side 方向,"B" 或者 "A", "B"是購買, "A"是出售.

targetAsset 目標虛擬資產的UUID.

price 價格，如果操作方向是"B", 價格就是AssetUUID的價格; 如果操作方向是"B", 價格就是轉給Ocean.one幣的價格.

def self.GenerateOceanMemo(targetAsset,side,price)
  memo = Base64.encode64(MessagePack.pack({
  "A" => UUID.parse(targetAsset).to_raw,
  "S" => side,
  "P" => price,
  "T" => "L"
  }))
  return memo.sub("
","")
end

買入BTC的代碼如下：

if ocmd == "b1"
  p "Input the price of BTC/USDT: "
  bprice = gets.chomp
  p "Input the amount of USDT: "
  amount = gets.chomp
  memo = Utils.GenerateOceanMemo(BTC_ASSET_ID,"B",bprice)
  p memo
  assetsInfo = walletAccount.read_asset(USDT_ASSET_ID)
  if assetsInfo["data"]["balance"].to_f >= 1 && assetsInfo["data"]["balance"].to_f >= amount.to_f
    transInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),
                                      {
                                        asset_id: USDT_ASSET_ID,
                                        opponent_id: OCEANONE_BOT,
                                        amount: amount,
                                        trace_id: SecureRandom.uuid,
                                        memo: memo
                                      })
    p transInfo
    p "The Order id is " + transInfo["data"]["trace_id"] + " It"s needed by cancel-order!"
  else
    p "Not enough USDT"
  end
end

轉打算出售的XIN給Ocean.one(OCEANONE_BOT),將你打算換回來的目標虛擬資產的UUID放入memo.

if ocmd == "s1"
  p "Input the price of BTC/USDT: "
  bprice = gets.chomp
  p "Input the amount of BTC: "
  amount = gets.chomp
  memo = Utils.GenerateOceanMemo(USDT_ASSET_ID,"A",bprice)
  p memo
  assetsInfo = walletAccount.read_asset(BTC_ASSET_ID)
  if assetsInfo["data"]["balance"].to_f > 0 && assetsInfo["data"]["balance"].to_f >= amount.to_f
    transInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),
                                      {
                                        asset_id: BTC_ASSET_ID,
                                        opponent_id: OCEANONE_BOT,
                                        amount: amount,
                                        trace_id: SecureRandom.uuid,
                                        memo: memo
                                      })
    p transInfo
    p "The Order id is " + transInfo["data"]["trace_id"] + " It"s needed by cancel-order!"
  else
    p "Not enough BTC"
  end
end

一個成功的掛單如下：

Make your choose(eg: q for Exit!):
b1
"Input the price of BTC/USDT: "
7777
"Input the amount of USDT: "
1
"hKFBxBDG0McoJiRCm44N2dGbZZL6oVOhQqFQpDc3NzehVKFM"
{"data"=>{"type"=>"transfer", "snapshot_id"=>"10178f11-4e05-4076-b7c9-006e95919a1b",
"opponent_id"=>"aaff5bef-42fb-4c9f-90e0-29f69176b7d4", "asset_id"=>"815b0b1a-2764-3736-8faa-42d694fa620a",
"amount"=>"-1", "trace_id"=>"89025aab-598f-43e5-834a-2feaa01797ff",
"memo"=>"hKFBxBDG0McoJiRCm44N2dGbZZL6oVOhQqFQpDc3NzehVKFM", "created_at"=>"2019-05-27T06:53:07.135709255Z", "counter_user_id"=>"aaff5bef-42fb-4c9f-90e0-29f69176b7d4"}}
"The Order id is 89025aab-598f-43e5-834a-2feaa01797ff It"s needed by cancel-order!"

Ocean.one將trace_id當做訂單，比如上面的例子， 89025aab-598f-43e5-834a-2feaa01797ff 就是訂單號，我們用他來取消訂單。

if ocmd == "c"
  p "Input the Order ID: "
  orderid = gets.chomp
  memo1 = Base64.encode64(MessagePack.pack({
  "O" => UUID.parse(orderid).to_raw
  }))
  memo = memo1.sub("
","")
  assetsInfo = walletAccount.read_asset(CNB_ASSET_ID)
  if assetsInfo["data"]["balance"].to_f > 0
    transInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),
                                      {
                                        asset_id: CNB_ASSET_ID,
                                        opponent_id: OCEANONE_BOT,
                                        amount: "0.00000001",
                                        trace_id: SecureRandom.uuid,
                                        memo: memo
                                      })
    p transInfo
  else
    p "Not enough CNB!"
  end
end

if cmd == "aw"
  assetsInfo = walletAccount.read_assets()
  p "--------The Wallet Assets List-----------------"
  assetsInfo["data"].each { |x| puts x["symbol"] + " " +
                              x["balance"] + " " + x["public_key"] +
                              x["account_name"] + " " + x["account_tag"]}
  p "----------End of Wallet Assets --------------"
end

編譯執行，即可開始交易了.

編譯執行，即可開始交易了.

[x] ruby bitcoin-wallet-ruby.rb 運行.

本代碼執行時的命令列表:

1: Fetch BTC/USDT Order Book

2: Fetch XIN/USDT Order Book

3: Fetch ERC20/USDT Order Book

s1: Sell BTC/USDT

b1: Buy BTC/USDT

s2: Sell XIN/USDT

b2: Buy XIN/USDT

s3: Sell ERC20/USDT

s3: Buy ERC20/USDT

c: Cancel the order

q: Exit

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

完整代碼