What’s New in 0.8.0-preview1

Preview — 0.8.0-preview1: APIs may change before stable release.

The 0.8.0-preview1 release introduces several major features for building sophisticated Cardano applications in Java.

New Features

Unified Tx API

ScriptTx is now deprecated. All script operations — collectFrom with redeemers, Plutus minting, validator attachment, and script-protected staking/governance — are available directly on the Tx class. This eliminates the need to choose between Tx and ScriptTx, and allows mixing script and non-script operations in a single transaction object.

TxFlow — Multi-Step Transaction Orchestration

TxFlow provides a builder-based API for orchestrating multi-step Cardano transactions with automatic UTXO chaining, confirmation tracking, rollback detection, and retry logic. Build complex transaction workflows like token deployment pipelines, multi-party swap sequences, or batched operations — all with declarative configuration.

TxPlan — YAML-Based Transactions

TxPlan allows you to define Cardano transactions in YAML format with variable substitution and context properties. Transactions can be loaded from YAML files, configured externally, and executed through the standard QuickTxBuilder pipeline. Part of the quicktx module — no additional dependency required.

MpfTrie — Verified Data Structures

Production-ready Merkle Patricia Forestry (MPF) with RocksDB persistence. Build verifiable data structures compatible with Aiken’s on-chain proof verification. Includes multi-version support, garbage collection strategies, and batch operations for high-throughput scenarios.

Gradle Dependencies

// Preview version
def cclVersion = "0.8.0-preview1"

dependencies {
    // Core library (includes quicktx with Unified Tx API and TxPlan)
    implementation "com.bloxbean.cardano:cardano-client-lib:${cclVersion}"

    // TxFlow module (multi-step transaction orchestration)
    implementation "com.bloxbean.cardano:txflow:${cclVersion}"

    // MpfTrie with RocksDB persistence
    implementation "com.bloxbean.cardano:merkle-patricia-forestry-rocksdb:${cclVersion}"

    // Backend provider (choose one)
    implementation "com.bloxbean.cardano:cardano-client-backend-blockfrost:${cclVersion}"
}

API Stability

These APIs are provided as a preview for early adopters. While the core concepts and overall design are stable, specific method signatures, configuration options, and default behaviors may change before the final 0.8.0 release based on community feedback.

If you encounter issues or have suggestions, please open an issue on GitHub .