Solution 1: Currency trading through ExinCore API
Exincore A currency exchange API based on Mixin Network is provided.
You can pay USDT to ExinCore. ExinCore will transfer your purchase of bitcoin to you at the lowest price and the most favorable transaction fee. Every currency transaction is anonymous and can be verified on the chain. Only you and ExinCore know the details of the transaction!
ExinCore doesn't know who you are, it only knows your UUID.
Preparatory knowledge:
First, you need to create a robot. The method is Tutorial 1.
Install dependency packages
As we mentioned in tutorial 1, we need to rely on mixin-java-sdk You should install it first. Here we install other packages.
Download address: mvnrepository
dependencies of build.gradle.kts, add the following dependency packages:
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")
Fill in the money to Mixin Network and read out its balance.
Through ExinCore API, BTC, USDT, EOS, ETH and so on can be traded. Here is a demonstration of using USDT to buy BTC or using BTC to buy USDT. Before trading, check the wallet address.
The complete steps are as follows:
- Check the balance of Bitcoin or USDT, wallet address. And write down the wallet address.
- From a third-party exchange or your cold wallet, fill the money with the above wallet address.
- Check the balance of the currency again and see if it is in the account. (The arrival time of Bitcoin is five blocks high, about 100 minutes).
Bitcoin has the same replenishment address as USDT.
private static final String BTC_ASSET_ID = "c6d0c728-2624-429b-8e0d-d9d19b6592fa"; private static final String EOS_ASSET_ID = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"; private static final String USDT_ASSET_ID = "815b0b1a-2764-3736-8faa-42d694fa620a"; MixinAPI mixinApiUser = generateAPI_FromCSV(); JsonObject asset = 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("-----------------------------------------------------------------------");
Query ExinCore Market Price Information
How to query the price information of ExinCore market? If you want to buy Bitcoin and sell USDT, then the base currency is USDT; if you want to buy USDT and sell Bitcoin, the base currency is Bitcoin.
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("-----------------------------------------------------------------------"); } private static JsonArray FetchExinOneMarketInfos(String url) { OkHttpClient client = new OkHttpClient(); String baseUrl = "https://exinone.com/exincore/markets?base_asset="; String fullUrl = baseUrl + url; Request request = new Request.Builder() .url(fullUrl) .build(); try { Response response = client.newCall(request).execute(); if (!response.isSuccessful()) { throw new IOException("Unexpected code " + response); } return processJsonObjectWithDataOrError(response.body().string()); } catch(Exception e) { e.printStackTrace(); } return null; } public static JsonArray processJsonObjectWithDataOrError(String res) { JsonParser parser = new JsonParser(); JsonElement jsonTree = parser.parse(res); if ( jsonTree.isJsonObject() ) { if ( jsonTree.getAsJsonObject().get("data") != null ) { return jsonTree.getAsJsonObject().get("data").getAsJsonArray(); } } return null; }
Before trading, create a Memo!
In the second chapter, Java Bitcoin Development Tutorial Based on Mixin Network: Robots Accept Bitcoins and Return Users Immediately We've learned to refund user Bitcoins. Here, besides paying ExinCore, we tell him what we want to buy, that is, to deposit the money we want to buy in memo.
public static String encodeUUID(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 = new ByteArrayOutputStream(); output.write(prex); output.write(packedData); byte[] out = output.toByteArray(); return Base64.getEncoder().encodeToString(out); } catch (Exception e) { e.printStackTrace(); } return null; }
Complete process of currency trading
When transferring money to ExinCore, write memo into the currency you want to buy, otherwise, ExinCore will give you a direct refund!
If you want to sell Bitcoin and buy USDT, the call is as follows:
private static final String EXIN_BOT = "61103d28-3ac2-44a2-ae34-bd956070dab1"; private static final String BTC_ASSET_ID = "c6d0c728-2624-429b-8e0d-d9d19b6592fa"; private static final String EOS_ASSET_ID = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"; private static final String USDT_ASSET_ID = "815b0b1a-2764-3736-8faa-42d694fa620a"; private static final String BTC_WALLET_ADDR = "14T129GTbXXPGXXvZzVaNLRFPeHXD1C25C"; private static final String MASTER_UUID = "0b4f49dc-8fb4-4539-9a89-fb3afc613747"; if ( input.equals("5") ) { MixinAPI mixinApiUser = generateAPI_FromCSV(); UUID usdtUUID = UUID.fromString(USDT_ASSET_ID); String memoTarget = encodeUUID(usdtUUID); System.out.println("------------------------USDT-BTC-EXCHANGE----------------------------"); System.out.println(memoTarget); JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID); System.out.println(asset); System.out.println(asset.get("balance").getAsFloat()); if ( (asset.get("balance").getAsFloat() * 10000) >= 1 ) { JsonObject transInfo = 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("-----------------------------------------------------------------------"); } else System.out.println("-----------------------------------------------------------------------"); }
If you want to sell USDT and buy Bitcoin, the call is as follows:
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("-----------------------------------------------------------------------"); } else System.out.println("-----------------------------------------------------------------------"); }
After the transaction is completed, Exincore will transfer the money you need to your account. Similarly, it will record the transaction price, transaction cost and other information in memo. You just need to unlock it in the following way!
- getSnapshots read the transaction record of the wallet.
if ( input.equals("7") ) { MixinAPI mixinApiUser = generateAPI_FromCSV(); String transDatetime = ""; String assetUUID = ""; 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(); } JsonArray snapshots = mixinApiUser.getSnapshots(assetUUID,3,transDatetime,"ASC"); // System.out.println(snapshots); snapshots.forEach((element) -> { JsonObject jsonObj = 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()); MessageUnpacker unpacker = MessagePack.newDefaultUnpacker(encoded); Value memoVal = unpacker.unpackValue(); if ( memoVal.isMapValue()) { Map<Value, Value> map = 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()); ByteBuffer AssetBinValue = map.get(ValueFactory.newString("FA")).asRawValue().asByteBuffer(); System.out.println("Fee is asset UUID is " + ByteBufferAsUuid(AssetBinValue)); ByteBuffer TraceBinValue = map.get(ValueFactory.newString("O")).asRawValue().asByteBuffer(); System.out.println("The trace id is " + ByteBufferAsUuid(TraceBinValue)); } } } catch(Exception e) { e.printStackTrace(); } } }); }
A successful transaction is as follows:
Make your choose(eg: q for Exit!): 7 7 -------------------------get-Snapshots--------------------------------------------- hqFDzQPooVCnNTIyNi4wM6FGqTAuMDAxMDQ1MqJGQcQQgVsLGidkNzaPqkLWlPpiCqFUoVKhT8QQPAsBVqKtQ5uS67M/ZTNleg== Exchange successful Code: 1000 Price is 5226.03 Fee is 0.0010452 Type is R Fee is asset UUID is 815b0b1a-2764-3736-8faa-42d694fa620a The trace id is 3c0b0156-a2ad-439b-92eb-b33f6533657a ---------------------end-of-get-Snapshots---------------------------------------------
Read the balance of the currency
By reading the balance of the currency, to confirm the trading situation!
MixinAPI mixinApiUser = generateAPI_FromCSV(); JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);
Source code execution
Compile and execute, and you can start trading.
- gradle build compiler project.
- Java-cp runs the project.
java -cp .:build/libs/bitcoin_wallet-java.jar:libs/* bitcoin_wallet.java.App
Note: You cannot use gradle run because the System.console().readLine() we use is not supported by Gradle and can only use java -cp.
To run!
List of commands at the time of execution of this code:
- 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!):