Cardano Client Lib

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

Latest Stable Version: 0.7.1 

Preview Release Available: 0.8.0-preview1 introduces TxFlow (multi-step transaction orchestration), TxPlan (YAML transactions), MpfTrie (verified data structures), and the Unified Tx API.

Overview

Cardano Client Lib provides a comprehensive set of tools for building Cardano applications in Java:

• Transaction Building - Build and submit transactions with simple declarative APIs
• Token Minting - Mint native tokens and NFTs with built-in policy script support
• Smart Contracts - Interact with Plutus smart contracts
• Address Generation - Generate addresses from mnemonics
• Multiple Backends - Connect via Blockfrost, Koios, or Ogmios

Quick Links

• Getting Started - Learn the basic concepts
• QuickTx API - Build transactions with declarative API
• API Reference - Detailed API documentation
• Examples  - Code examples repository

What’s New (0.8.0 Preview)

• Unified Tx API - ScriptTx merged into Tx — one class for all transaction types
• TxFlow - Multi-step transaction orchestration with UTXO chaining and rollback handling
• TxPlan - YAML-based transaction definitions with variable substitution
• MpfTrie - Merkle Patricia Forestry with RocksDB for on-chain proof verification

Recent Posts

• Introducing QuickTx API to build transactions 
• Composable functions to build transactions 
• Demo: Test Aiken Smart Contract Using Java Offchain Code with Yaci DevKit 

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

QuickTx API

• Build and submit transaction with simple declarative style API
• Supports:
  • Payment transaction
  • Token Minting and token transfer
  • Plutus smart contract call
  • Token minting with Plutus contract
  • Staking operations
  • Governance transactions (Preview)

Composable Functions

• Composable functions to build transaction
• Supports:
  • Payment transaction
  • Token Minting and token transfer
  • Plutus smart contract call
  • Token minting with Plutus contract

High Level API (Deprecated)

• To build and submit:
  • Payment transaction
  • Token Minting and token transfer transaction

CIP Implementations

• CIP20 - Transaction Message/Comment metadata 
• CIP25 - NFT Metadata Standard 
• CIP8 - Message Signing 
• CIP30 - dApp signData & verify 
• CIP27 - CNFT Community Royalties Standard 
• CIP68 - Datum Metadata Standard 

Backend Integration

The library provides integration with Cardano node through different backend services:

Available Backend APIs

• 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