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A client library for Cardano in Java. This library simplifies the interaction with Cardano blockchain from a Java application.

Latest Stable Version: 0.2.0

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Examples

Cardano-client-lib examples repository

JavaDoc

Documentation

Features

Address Generation

Address Generation (Base Address, Enterprise Address)
Generate Address from Mnemonic phase

Transaction Serialization & Signing

API to build Payment transaction (ADA & Native Tokens)
CBOR serialization of transaction
Transaction signing

High Level api

To build and submit
- Payment transaction
- Token Minting and token transfer transaction

Composable Functions

To build and submit
- Payment transaction
- Token Minting and token transfer
- Plutus smart contract call
- Token minting with Plutus contract

Examples with Composable Functions

CIP Implementations

Metadata Builder

Helper to build Metadata
Converter to conver JSON (No Schema) to Metadata format

Token Minting

Token Minting transaction builder
Native script (ScriptAll, ScriptAny, ScriptAtLeast, ScriptPubKey, RequireTimeAfter, RequireTimeBefore)
Policy Id generation

Backend Integration

The library also provides integration with Cardano node through different backend services. Out of box, the library currently supports integration with following providers through the Backend api.

Blockfrost
- Module : cardano-client-backend-blockfrost README
- Status : Stable
Koios
- Module : cardano-client-backend-koios README
- Status : Beta
Ogmios
- Module : cardano-client-backend-koios README
- Status : Experimental
- Supported Apis : submitTransaction, evaluateTx
cardano-graphql
- Module : cardano-client-backend-gql README
- Status : Deprecated

Following Backend apis are currently available

TransactionService (Submit transaction, Get transaction, Evaluate ExUnits for Script Txn)
AddressService (Get address details)
UtxoService (Get utxos for an address)
AssetService
BlockService
NetworkInfoService
EpochService
MetadataService

Use as a library in a Java Project

For release binaries

For Maven, add the following dependencies to project's pom.xml

Core module

        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-lib</artifactId>
            <version>0.2.0</version>
        </dependency>

Backend modules
- For backend support, use one of the following supported backend module

        <!-- For Blockfrost backend -->
        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-backend-blockfrost</artifactId>
            <version>0.2.0</version>
        </dependency>
        
         <!-- For Koios backend -->
        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-backend-koios</artifactId>
            <version>0.2.0</version>
        </dependency>
        
         <!-- For Ogmios backend -->
        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-backend-ogmios</artifactId>
            <version>0.2.0</version>
        </dependency>

        <!-- For Cardano Graphql backend -->
        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-backend-gql</artifactId>
            <version>0.2.0</version>
        </dependency>

For Gradle, add the following dependencies to build.gradle

Core Module

implementation 'com.bloxbean.cardano:cardano-client-lib:0.2.0'

Backend modules
- For backend support, use one of the following supported backend module

//For Blockfrost
implementation 'com.bloxbean.cardano:cardano-client-backend-blockfrost:0.2.0'

//For Koios
implementation 'com.bloxbean.cardano:cardano-client-backend-koios:0.2.0'

//For Ogmios
implementation 'com.bloxbean.cardano:cardano-client-backend-ogmios:0.2.0'

//For Cardano Graphql
implementation 'com.bloxbean.cardano:cardano-client-backend-gql:0.2.0'

For snapshot binaries

SNAPSHOT_VERSION : 0.3.0-SNAPSHOT (Please verify the latest snapshot version in gradle.properties)

For Maven, add the following dependencies and repository to project's pom.xml

    <dependencies>
        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-lib</artifactId>
            <version>{SNAPSHOT_VERSION}</version>
        </dependency>
        <dependency>
            <groupId>com.bloxbean.cardano</groupId>
            <artifactId>cardano-client-backend-blockfrost</artifactId>
            <version>{SNAPSHOT_VERSION}</version>
        </dependency>
    </dependencies>
    
    <repositories>
        <repository>
            <id>snapshots-repo</id>
            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
            <releases>
                <enabled>false</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>

For Gradle, add the following dependencies and repository to build.gradle

repositories {
    ...
    maven {
        url "https://oss.sonatype.org/content/repositories/snapshots"
    }
}

implementation 'com.bloxbean.cardano:cardano-client-lib:{SNAPSHOT_VERSION}'
implementation 'com.bloxbean.cardano:cardano-client-backend-blockfrost:{SNAPSHOT_VERSION}'

Account API Usage

Create a New Account

Account account = new Account();   //Create a Mainnet account

Account account = new Account(Networks.mainnet());   //Create a Mainnet account

Account account = new Account(Networks.testnet());  //Create a Testnet account

Get base address, enterprise address, mnemonic

String baseAddress = account.baseAddress();  //Base address at index=0

String enterpriseAddress = account.account.enterpriseAddress();  //Enterprise address at index = 0

String mnemonic = account.mnemonic();  //Get Mnemonic

Get Account from Mnemonic

String mnemonic = "...";
Account account = new Account(mnemonic);  //Create a Mainnet account from Mnemonic

Account account = new Account(Networks.testnet(), mnemonic); //Create a Testnet account from Mnemonic

Create Blockfrost Backend Service and get other services

BackendService backendService =
                new BFBackendService(Constants.BLOCKFROST_TESTNET_URL, <BF_PROJECT_ID>);               

FeeCalculationService feeCalculationService = backendService.getFeeCalculationService();
TransactionHelperService transactionHelperService = backendService.getTransactionHelperService();
TransactionService transactionService = backendService.getTransactionService();
BlockService blockService = backendService.getBlockService();
AssetService assetService = backendService.getAssetService();
UtxoService utxoService = backendService.getUtxoService();
MetadataService metadataService = backendService.getMetadataService();
EpochService epochService = backendService.getEpochService();
AddressService addressService = backendService.getAddressService();

Simple ADA Payment transaction

  PaymentTransaction paymentTransaction = PaymentTransaction.builder()
                                            .sender(sender)
                                            .receiver(receiver)
                                            .amount(BigInteger.valueOf(1500000))
                                            .unit("lovelace")
                                            .build();
          
  //Calculate Time to Live        
  long ttl = blockService.getLastestBlock().getValue().getSlot() + 1000;
  TransactionDetailsParams detailsParams =
                TransactionDetailsParams.builder()
                        .ttl(ttl)
                        .build();

  //Calculate fee
  BigInteger fee
          = feeCalculationService.calculateFee(paymentTransaction, detailsParams, null);
  paymentTransaction.setFee(fee);                                        

  Result<String> result = 
                    transactionHelperService.transfer(paymentTransaction, detailsParam);

  if(result.isSuccessful())
      System.out.println("Transaction Id: " + result.getValue());

Native Token transfer

 PaymentTransaction paymentTransaction =
                PaymentTransaction.builder()
                        .sender(sender)
                        .receiver(receiver)
                        .amount(BigInteger.valueOf(12))
                        .unit("329728f73683fe04364631c27a7912538c116d802416ca1eaf2d7a96736174636f696e")
                        .build();

 //Calculate Time to Live        
  long ttl = blockService.getLastestBlock().getValue().getSlot() + 1000;
  TransactionDetailsParams detailsParams =
                TransactionDetailsParams.builder()
                        .ttl(ttl)
                        .build();

  //Calculate fee
  BigInteger fee
          = feeCalculationService.calculateFee(paymentTransaction, detailsParams, null);
  paymentTransaction.setFee(fee); 
                                            
 Result<String> result = transactionHelperService.transfer(paymentTransaction, detailsParam);

 if(result.isSuccessful())
     System.out.println("Transaction Id: " + result.getValue());

ScriptHash

Example: 1

ScriptPubkey scriptPubkey = new ScriptPubkey("ad7a7b87959173fc9eac9a85891cc93892f800dd45c0544128228884")
String policyId = scriptPubkey.getPolicyId();

Example: 2

ScriptPubkey scriptPubkey1 = ...;
SecretKey sk1 = ...;

ScriptPubkey scriptPubkey2 = ...;
SecretKey sk2 = ...;

ScriptPubkey scriptPubkey3 = ...;
SecretKey sk3 = ...;

ScriptAtLeast scriptAtLeast = new ScriptAtLeast(2)
                .addScript(scriptPubkey1)
                .addScript(scriptPubkey2)
                .addScript(scriptPubkey3);

String policyId = scriptAtLeast.getPolicyId();

Token Minting transaction

MultiAsset multiAsset = new MultiAsset();
multiAsset.setPolicyId(policyId);

Asset asset = new Asset("testtoken"), BigInteger.valueOf(250000));
multiAsset.getAssets().add(asset);

MintTransaction mintTransaction = MintTransaction.builder()
                        .sender(sender)
                        .receiver(receiver)
                        .mintAssets(Arrays.asList(multiAsset))
                        .policyScript(scriptAtLeast)
                        .policyKeys(Arrays.asList(sk2, sk3))
                        .build();
                        
//Calculate Time to Live        
long ttl = blockService.getLastestBlock().getValue().getSlot() + 1000;
TransactionDetailsParams detailsParams =
                TransactionDetailsParams.builder()
                        .ttl(ttl)
                        .build();

//Calculate fee
BigInteger fee
          = feeCalculationService.calculateFee(mintTransaction, detailsParams, null);
mintTransaction.setFee(fee);

Result<String> result = transactionHelperService.mintToken(mintTransaction,
                TransactionDetailsParams.builder().ttl(getTtl()).build());

Metadata

CBORMetadataMap productDetailsMap
                = new CBORMetadataMap()
                .put("code", "PROD-800")
                .put("slno", "SL20000039484");

CBORMetadataList tagList
                = new CBORMetadataList()
                .add("laptop")
                .add("computer");

Metadata metadata = new CBORMetadata()
                .put(new BigInteger("670001"), productDetailsMap)
                .put(new BigInteger("670002"), tagList);
PaymentTransaction paymentTransaction =
                PaymentTransaction.builder()
                        ...
                        .build();

long ttl = blockService.getLastestBlock().getValue().getSlot() + 1000;
TransactionDetailsParams detailsParams =
                TransactionDetailsParams.builder()
                        .ttl(ttl)
                        .build();

//Also add metadata for fee calculation
BigInteger fee = feeCalculationService.calculateFee(paymentTransaction, detailsParams, metadata);
paymentTransaction.setFee(fee);

//Send metadata as 3rd parameter
Result<String> result
                = transactionHelperService.transfer(paymentTransaction, detailsParams, metadata);

UtxoSelectionStrategy

The utxo selection strategy can be changed by providing a custom implementation of "UtxoSelectionStrategy" interface. By default, the high level api like TransactionHelperService uses a default out-of-box implementation "DefaultUtxoSelectionStrategyImpl". The default strategy is too simple and finds all required utxos sequentially. But it may not be efficient for some usecases.

You can use a custom or different implementation of UtxoSelectionStrategy to change the default utxo selection behaviour.

UtxoSupplier utxoSupplier = new DefaultUtxoSupplier(utxoService);
ProtocolParamsSupplier protocolParamsSupplier = new DefaultProtocolParamsSupplier(epochService);

//Create TransactionHelperService with LargestFirst
TransactionBuilder transactionBuilder = new TransactionBuilder(new LargestFirstUtxoSelectionStrategy(utxoSupplier), protocolParamsSupplier);
TransactionHelperService transactionHelperService = new TransactionHelperService(transactionBuilder, new DefaultTransactionProcessor(transactionService));

//Get FeeCalculationService using the above TransactionHelperService
FeeCalculationService feeCalculationService = backendService.getFeeCalculationService(transactionHelperService);

Build

git clone https://github.com/bloxbean/cardano-client-lib.git

export JAVA_TOOL_OPTIONS=-Dfile.encoding=UTF8
./gradlew clean build

Run Integration Tests

export BF_PROJECT_ID=<Blockfrost Project Id>
./gradlew :integration-test:integrationTest -PBF_PROJECT_ID=${BF_PROJECT_ID}

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Name		Name	Last commit message	Last commit date
Latest commit History 376 Commits
.github		.github
backend-modules		backend-modules
backend		backend
gradle/wrapper		gradle/wrapper
integration-test		integration-test
src		src
static		static
.gitignore		.gitignore
Jenkinsfile		Jenkinsfile
Jenkinsfile.it		Jenkinsfile.it
LICENSE		LICENSE
README-0_1_5.md		README-0_1_5.md
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle		settings.gradle

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Repository files navigation

Address Generation

Transaction Serialization & Signing

High Level api

Composable Functions

CIP Implementations

Metadata Builder

Token Minting

Backend Integration

Use as a library in a Java Project

For release binaries

For snapshot binaries

Account API Usage

Create Blockfrost Backend Service and get other services

Simple ADA Payment transaction

Native Token transfer

ScriptHash

Token Minting transaction

Metadata

UtxoSelectionStrategy

Build

Run Integration Tests

Used by

Sponsors 💖

If this project helps you reduce time to develop on Cardano or if you just want to support this project, you can delegate to our pool:

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Address Generation

Transaction Serialization & Signing

High Level api

Composable Functions

CIP Implementations

Metadata Builder

Token Minting

Backend Integration

Use as a library in a Java Project

For release binaries

For snapshot binaries

Account API Usage

Create Blockfrost Backend Service and get other services

Simple ADA Payment transaction

Native Token transfer

ScriptHash

Token Minting transaction

Metadata

UtxoSelectionStrategy

Build

Run Integration Tests

Used by

Sponsors 💖

If this project helps you reduce time to develop on Cardano or if you just want to support this project, you can delegate to our pool:

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