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.

正如教程一里我們介紹過的， 我們需要依賴 mixin-sdk-php, 你應該已經先安裝過它了.

第四課, 在上一課中已經安裝好了.

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。

  const BTC_ASSET_ID     = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";
  const EOS_ASSET_ID     = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";
  const USDT_ASSET_ID    = "815b0b1a-2764-3736-8faa-42d694fa620a";

  $mixinSdk_eachAccountInstance = new MixinSDK(GenerateConfigByCSV($data));
  $asset_info = $mixinSdk_eachAccountInstance->Wallet()->readAsset(BTC_ASSET_ID);
  print_r("Bitcoin wallet address is :".$asset_info["public_key"]."
");
  print_r("Bitcoin wallet balance is :".$asset_info["balance"]."
");

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 ( $ocmd == "1") { getOceanOneMarketInfos(XIN_ASSET_ID,USDT_ASSET_ID);}
function getOceanOneMarketInfos($targetCoin, $baseCoin)  {
  $client = new GuzzleHttpClient();
  $baseUrl = "https://events.ocean.one/markets/".$targetCoin."-".$baseCoin."/book";
  $res = $client->request("GET", $baseUrl, [
      ]);
  if ($res->getStatusCode() == "200") {
    // echo $res->getStatusCode() . PHP_EOL;
    $resInfo = json_decode($res->getBody(), true);
    echo "Side | Price | Amount | Funds" . PHP_EOL;
    foreach ($resInfo["data"]["data"]["asks"] as $key => $exchange) {
      echo $exchange["side"] . " " . $exchange["price"] . " " . $exchange["amount"] ." " . $exchange["funds"] . PHP_EOL;
    }
    foreach ($resInfo["data"]["data"]["bids"] as $key => $exchange) {
      echo $exchange["side"] . " " . $exchange["price"] . " " . $exchange["amount"] ." " . $exchange["funds"] . PHP_EOL;
    }
  }
}

在第二章里,基于Mixin Network的 PHP 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.

asset 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.

function GenerateOrderMemo($side, $asset, $price) :string {
  $memo = base64_encode(MessagePack::pack([
                       "S" => $side,
                       "A" => Uuid::fromString($asset)->getBytes(),
                       "P" => $price,
                       "T" => "L",
                       ]));
  return $memo;
}

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.

const OCEANONE_BOT     = "aaff5bef-42fb-4c9f-90e0-29f69176b7d4";
const USDT_ASSET_ID    = "815b0b1a-2764-3736-8faa-42d694fa620a";
const XIN_ASSET_ID     = "c94ac88f-4671-3976-b60a-09064f1811e8";

if ( $ocmd == "s1") {
  $p = readline("Input the Price of XIN/USDT: ");
  $a = readline("Input the Amount of XIN: ");
  $tMemo = GenerateOrderMemo("A",USDT_ASSET_ID,$p);
  echo $tMemo .  PHP_EOL;
  $mixinSdk_WalletInstance = GenerateWalletSDKFromCSV();
  $asset_info = $mixinSdk_WalletInstance->Wallet()->readAsset(XIN_ASSET_ID);
  print_r($asset_info);
  if ( (float) $asset_info["balance"] >= (float) $a ) {
    $transInfos = $mixinSdk_WalletInstance->Wallet()->transfer(XIN_ASSET_ID,OCEANONE_BOT,
                                                $mixinSdk_WalletInstance->getConfig()["default"]["pin"],
                                                $a,
                                                $tMemo);
    print_r($transInfos);
    echo "The Order ID (trace_id) is: " . $transInfos["trace_id"] . PHP_EOL;
  } else { echo "Not enough XIN!
";}
}

如果你是打算買XIN,操作如下:

if ( $ocmd == "b1") {
  $p = readline("Input the Price of XIN/USDT: ");
  $a = readline("Input the Amount of USDT: ");
  $tMemo = GenerateOrderMemo("B",XIN_ASSET_ID,$p);
  echo $tMemo .  PHP_EOL;
  $mixinSdk_WalletInstance = GenerateWalletSDKFromCSV();
  $asset_info = $mixinSdk_WalletInstance->Wallet()->readAsset(USDT_ASSET_ID);

  print_r($asset_info);
  if ( ((float) $asset_info["balance"] >= 1) && ( (float) $asset_info["balance"] >= (float) $a ) ) {
    $transInfos = $mixinSdk_WalletInstance->Wallet()->transfer(USDT_ASSET_ID,OCEANONE_BOT,
                                                $mixinSdk_WalletInstance->getConfig()["default"]["pin"],
                                                $a,
                                                $tMemo);
    print_r($transInfos);
    echo "The Order ID (trace_id) is: " . $transInfos["trace_id"] . PHP_EOL;
  } else { echo "Not enough USDT!
";}
}

一個成功的掛單如下：

Input the Price of XIN/USDT: 112
Input the Amount of USDT: 1
hKFToUKhQcQQyUrIj0ZxOXa2CgkGTxgR6KFQozExMqFUoUw=
client id is:26b20aa5-40c0-3e00-9de0-666cfb6f2daa
Array
(
    [type] => asset
    [asset_id] => 815b0b1a-2764-3736-8faa-42d694fa620a
    [chain_id] => c6d0c728-2624-429b-8e0d-d9d19b6592fa
    [symbol] => USDT
    [name] => Tether USD
    [icon_url] => https://images.mixin.one/ndNBEpObYs7450U08oAOMnSEPzN66SL8Mh-f2pPWBDeWaKbXTPUIdrZph7yj8Z93Rl8uZ16m7Qjz-E-9JFKSsJ-F=s128
    [balance] => 1
    [public_key] => 17z1Rq3VsyvvXvGWiHT8YErjBoFgnhErB8
    [account_name] =>
    [account_tag] =>
    [price_btc] => 0.00019038
    [price_usd] => 1.00036293
    [change_btc] => 0.013486479778200063
    [change_usd] => 0.005376748815937048
    [asset_key] => 815b0b1a-2764-3736-8faa-42d694fa620a
    [confirmations] => 6
    [capitalization] => 0
)
Array
(
    [type] => transfer
    [snapshot_id] => f4b1f8d6-004a-4d2b-997d-4d0acf1096cd
    [opponent_id] => aaff5bef-42fb-4c9f-90e0-29f69176b7d4
    [asset_id] => 815b0b1a-2764-3736-8faa-42d694fa620a
    [amount] => -1
    [trace_id] => b12eed67-6cf4-481f-b25b-dd41f28e1984
    [memo] => hKFToUKhQcQQyUrIj0ZxOXa2CgkGTxgR6KFQozExMqFUoUw=
    [created_at] => 2019-04-30T01:17:02.206240549Z
    [counter_user_id] => aaff5bef-42fb-4c9f-90e0-29f69176b7d4
)
The Order ID (trace_id) is: b12eed67-6cf4-481f-b25b-dd41f28e1984

Ocean.one將trace_id當做訂單，比如上面的例子， b12eed67-6cf4-481f-b25b-dd41f28e1984 就是訂單號，我們用他來取消訂單。

if ( $ocmd == "c" ) {
  $mixinSdk_WalletInstance = GenerateWalletSDKFromCSV();
  $asset_info = $mixinSdk_WalletInstance->Wallet()->readAsset(CNB_ASSET_ID);
  if ( ((float) $asset_info["balance"] == 0) ) {
     echo "Please deposit some CNB to this Wallet!" . PHP_EOL;
  } else {
     $orderid = readline("Input the Order id ( trace_id ): ");
     $cMemo =  base64_encode(MessagePack::pack([
                           "O" => Uuid::fromString($orderid)->getBytes(),
                           ]));
     $transInfos = $mixinSdk_WalletInstance->Wallet()->transfer(CNB_ASSET_ID,OCEANONE_BOT,
                                                 $mixinSdk_WalletInstance->getConfig()["default"]["pin"],
                                                 "0.00000001",
                                                 $cMemo);
     print_r($transInfos);
  }
}

Check the wallet"s balance.

if ($line == "aw") {
  $mixinSdk_eachAccountInstance = GenerateWalletSDKFromCSV();
  $asset_info = $mixinSdk_eachAccountInstance->Wallet()->readAssets();
  foreach ($asset_info as $key => $asset) {
    echo  $asset["symbol"] . "   " . $asset["asset_id"] ."   ". $asset["balance"] .
          "   ". $asset["public_key"].PHP_EOL;
  }
}

運行就可以開始交易了.

php bitcoin_wallet.php 運行項目

本代碼執行時的命令列表:

o: Ocean.One Exchange

q: Exit

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

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

q: Exit

完整代碼