方案一: 通过ExinCore API进行币币交易
Exincore 提供了基于Mixin Network的币币交易API.
你可以支付USDT给ExinCore, ExinCore会以最低的价格，最优惠的交易费将你购买的比特币转给你, 每一币交易都是匿名的，并且可以在链上进行验证，交易的细节只有你与ExinCore知道！
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ExinCore 也不知道你是谁，它只知道你的UUID.
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
正如教程一里我们介绍过的， 我们需要依赖 mixin-java-sdk , 你应该先安装过它了， 这儿我们再安装其它的软件包.
下载地址: mvnrepository
build.gradle.kts的dependencies，加入如下依赖的包：
implementation("com.google.guava:guava:27.0.1-jre") implementation("commons-codec:commons-codec:1.11") implementation("com.auth0:java-jwt:3.8.0") compile(files("libs/mixin-java-sdk.jar")) implementation("com.squareup.okhttp3:okhttp:3.12.1") implementation("com.squareup.okio:okio:2.2.2") implementation("com.google.code.gson:gson:2.8.5") implementation("org.bouncycastle:bcprov-jdk16:1.46") implementation("org.apache.commons:commons-csv:1.6") implementation("org.msgpack:msgpack-core:0.8.16") implementation("com.fasterxml.jackson.core:jackson-databind:2.9.8") implementation("com.fasterxml.jackson.core:jackson-core:2.9.8") implementation("org.jetbrains.kotlin:kotlin-stdlib:1.3.30")
充币到 Mixin Network, 并读出它的余额.
通过ExinCore API, 可以进行BTC, USDT, EOS, ETH 等等交易， 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个块的高度，约100分钟)。
比特币与USDT的充值地址是一样的。
privatestaticfinalStringBTC_ASSET_ID="c6d0c728-2624-429b-8e0d-d9d19b6592fa";privatestaticfinalStringEOS_ASSET_ID="6cfe566e-4aad-470b-8c9a-2fd35b49c68d";privatestaticfinalStringUSDT_ASSET_ID="815b0b1a-2764-3736-8faa-42d694fa620a";MixinAPImixinApiUser = generateAPI_FromCSV();JsonObjectasset = mixinApiUser.getAsset(BTC_ASSET_ID);System.out.println(asset);System.out.println("------------------------BTC------Information---------------------------");System.out.println("The BTC wallet address is "+ asset.get("public_key").getAsString());System.out.println("The BTC wallet balance is "+ asset.get("balance").getAsString());System.out.println("-----------------------------------------------------------------------");
查询ExinCore市场的价格信息
如何来查询ExinCore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.
if( input.equals("8") ) { JsonArray res = FetchExinOneMarketInfos(USDT_ASSET_ID); System.out.println("--exchange_asset--exchange_asset_symbol/base_asset_symbol--price--minimum--maximum--exchanges--");// System.out.println(res);res.forEach((element) -> { JsonObject jsonObj = element.getAsJsonObject(); System.out.println(jsonObj.get("exchange_asset").getAsString() +" "+ jsonObj.get("exchange_asset_symbol").getAsString() +"/"+ jsonObj.get("base_asset_symbol").getAsString() +" "+ jsonObj.get("price").getAsString() +" "+ jsonObj.get("minimum_amount").getAsString() +" "+ jsonObj.get("maximum_amount").getAsString() +" "+ jsonObj.get("exchanges").getAsString() ); }); System.out.println("-----------------------------------------------------------------------"); }privatestaticJsonArrayFetchExinOneMarketInfos(String url){ OkHttpClient client =newOkHttpClient(); String baseUrl ="https://exinone.com/exincore/markets?base_asset="; String fullUrl = baseUrl + url; Request request =newRequest.Builder() .url(fullUrl) .build();try{ Response response = client.newCall(request).execute();if(!response.isSuccessful()) {thrownewIOException("Unexpected code "+ response); }returnprocessJsonObjectWithDataOrError(response.body().string()); }catch(Exception e) { e.printStackTrace(); }returnnull; }publicstaticJsonArrayprocessJsonObjectWithDataOrError(String res){ JsonParser parser =newJsonParser(); JsonElement jsonTree = parser.parse(res);if( jsonTree.isJsonObject() ) {if( jsonTree.getAsJsonObject().get("data") !=null) {returnjsonTree.getAsJsonObject().get("data").getAsJsonArray(); } }returnnull; }
交易前，创建一个Memo!
在第二章里, 基于Mixin Network的 Java 比特币开发教程: 机器人接受比特币并立即退还用户 , 我们学习过退还用户比特币，在这里，我们除了给ExinCore支付币外，还要告诉他我们想购买的币是什么，即将想购买的币存到memo里。
publicstaticStringencodeUUID(UUID uuid){try{byte[] byteUuid = asBytes(uuid); MessageBufferPacker packer = MessagePack.newDefaultBufferPacker(); packer.writePayload(byteUuid); packer.close();byte[] packedData = packer.toByteArray();byte[] prex = { (byte)129, (byte)161,65, (byte)196,16}; ByteArrayOutputStream output =newByteArrayOutputStream(); output.write(prex); output.write(packedData);byte[]out= output.toByteArray();returnBase64.getEncoder().encodeToString(out); }catch(Exception e) { e.printStackTrace(); }returnnull;}
币币交易的完整流程
转币给ExinCore时，将memo写入你希望购买的币，否则，ExinCore会直接退币给你！
如果你想卖出比特币买入USDT,调用方式如下：
privatestaticfinalStringEXIN_BOT="61103d28-3ac2-44a2-ae34-bd956070dab1";privatestaticfinalStringBTC_ASSET_ID="c6d0c728-2624-429b-8e0d-d9d19b6592fa";privatestaticfinalStringEOS_ASSET_ID="6cfe566e-4aad-470b-8c9a-2fd35b49c68d";privatestaticfinalStringUSDT_ASSET_ID="815b0b1a-2764-3736-8faa-42d694fa620a";privatestaticfinalStringBTC_WALLET_ADDR="14T129GTbXXPGXXvZzVaNLRFPeHXD1C25C";privatestaticfinalStringMASTER_UUID="0b4f49dc-8fb4-4539-9a89-fb3afc613747";if( input.equals("5") ) {MixinAPImixinApiUser = generateAPI_FromCSV();UUIDusdtUUID =UUID.fromString(USDT_ASSET_ID);StringmemoTarget = encodeUUID(usdtUUID);System.out.println("------------------------USDT-BTC-EXCHANGE----------------------------");System.out.println(memoTarget);JsonObjectasset = mixinApiUser.getAsset(BTC_ASSET_ID);System.out.println(asset);System.out.println(asset.get("balance").getAsFloat());if( (asset.get("balance").getAsFloat() *10000) >=1) {JsonObjecttransInfo = mixinApiUser.transfer(BTC_ASSET_ID,EXIN_BOT,"0.0001",memoTarget);System.out.println("------------------------BTC Transfer To EXCHANGE Information----------------------");System.out.println(transInfo);System.out.println("-----------------------------------------------------------------------"); }elseSystem.out.println("-----------------------------------------------------------------------");}
如果你想卖出USDT买入比特币,调用方式如下：
if( input.equals("6") ) { MixinAPI mixinApiUser = generateAPI_FromCSV(); UUID btcUUID = UUID.fromString(BTC_ASSET_ID); String memoTarget = encodeUUID(btcUUID); System.out.println(memoTarget); System.out.println("-------------------------BTC-USDT-EXCHANGE----------------------------"); JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID); System.out.println(asset);if( asset.get("balance").getAsFloat() >=1) { JsonObject transInfo = mixinApiUser.transfer(USDT_ASSET_ID, EXIN_BOT,"1",memoTarget); System.out.println("------------------------USDT-BTC EXCHANGE Information----------------------"); System.out.println(transInfo); System.out.println("-----------------------------------------------------------------------"); }elseSystem.out.println("-----------------------------------------------------------------------");}
交易完成后，Exincore会将你需要的币转到你的帐上，同样，会在memo里，记录成交价格，交易费用等信息！你只需要按下面的方式解开即可！
getSnapshots 读取钱包的交易记录。
if( input.equals("7") ) {MixinAPImixinApiUser = generateAPI_FromCSV();StringtransDatetime ="";StringassetUUID ="";if( mixinApiUser.getClientID().equals("091651f2-19c3-34f0-b45e-724ff203d921") ) { transDatetime ="2019-04-19T06:53:22.593529Z"; assetUUID =USDT_ASSET_ID; }else{System.out.print("Input the transaction Date time (eg:2019-04-19T06:53:22.593529Z):"); transDatetime =System.console().readLine(); }JsonArraysnapshots = mixinApiUser.getSnapshots(assetUUID,3,transDatetime,"ASC");// System.out.println(snapshots);snapshots.forEach((element) -> {JsonObjectjsonObj = element.getAsJsonObject();if( jsonObj.get("amount").getAsFloat() >0&& jsonObj.get("data") != null ) {System.out.println(jsonObj.get("data").getAsString() );try{ byte[] encoded =Base64.getDecoder().decode(jsonObj.get("data").getAsString());MessageUnpackerunpacker =MessagePack.newDefaultUnpacker(encoded);ValuememoVal = unpacker.unpackValue();if( memoVal.isMapValue()) {Mapmap= memoVal.asMapValue().map();System.out.println(map.size());if(map.get(ValueFactory.newString("C")).asIntegerValue().asInt() ==1000) {System.out.println("Exchange successful"+" Code: "+map.get(ValueFactory.newString("C")).asIntegerValue());System.out.println("Price is "+map.get(ValueFactory.newString("P")).asStringValue());System.out.println("Fee is "+map.get(ValueFactory.newString("F")).asStringValue());System.out.println("Type is "+map.get(ValueFactory.newString("T")).asStringValue());ByteBufferAssetBinValue=map.get(ValueFactory.newString("FA")).asRawValue().asByteBuffer();System.out.println("Fee is asset UUID is "+ByteBufferAsUuid(AssetBinValue));ByteBufferTraceBinValue=map.get(ValueFactory.newString("O")).asRawValue().asByteBuffer();System.out.println("The trace id is "+ByteBufferAsUuid(TraceBinValue)); } } }catch(Exceptione) { e.printStackTrace(); } } });}
一次成功的交易如下：
Make your choose(eg: qforExit!):77-------------------------get-Snapshots---------------------------------------------hqFDzQPooVCnNTIyNi4wM6FGqTAuMDAxMDQ1MqJGQcQQgVsLGidkNzaPqkLWlPpiCqFUoVKhT8QQPAsBVqKtQ5uS67M/ZTNleg==Exchange successful Code:1000Priceis5226.03Feeis0.0010452TypeisRFeeisasset UUIDis815b0b1a-2764-3736-8faa-42d694fa620aThe trace idis3c0b0156-a2ad-439b-92eb-b33f6533657a---------------------end-of-get-Snapshots---------------------------------------------
读取币的余额
通过读取币的余额，来确认交易情况！
MixinAPImixinApiUser = generateAPI_FromCSV();JsonObjectasset = mixinApiUser.getAsset(BTC_ASSET_ID);
源代码执行
编译执行，即可开始交易了.
gradle build 编译项目.
java -cp 运行项目.
java -cp .:build/libs/bitcoin_wallet-java.jar:libs/* bitcoin_wallet.java.App
注意：不能使用gradle run来运行，因为我们使用的 System.console().readLine() 不被Gradle支持，只能使用 java -cp
来运行！
本代码执行时的命令列表:
1: Create Bitcoin Wallet and update PIN
2: Read Bitcoin balance & address
3: Read USDT balance & address
4: Read EOS balance & address
tbb:Transfer BTC from Bot to Wallet
tbm:Transfer BTC from Wallet to Master
teb:Transfer EOS from Bot to Wallet
tem:Transfer EOS from Wallet to Master
tub:Transfer USDT from Bot to Wallet
tum:Transfer USDT 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
wb: Withdraw BTC
we: WitchDraw EOS
a: Read All Assets Infos
q: Exit
Make your choose(eg: q for Exit!):
Solution Two: List your order on Ocean.One exchange
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