Open Source Java Bitcoin Software

bitcoinj is a library for working with the Bitcoin protocol. It can maintain a wallet, send/receive transactions without needing a local copy of Bitcoin Core and has many other advanced features. It's implemented in Java but can be used from any JVM compatible language, examples in Python and JavaScript are included. Highly optimized lightweight simplified payment verification (SPV) mode. In this mode, only a small part of the blockchain is downloaded, making bitcoin suitable for usage on constrained devices like smartphones or cheap virtual private servers. A wallet class with encryption, fee calculation, multi-signing, deterministic key derivation, pluggable coin selection/coin control, extensions support and event listeners that let you stay up to date with changes in your balance. Experimental full verification mode, which does the same verification work as Bitcoin Core. In this mode, the unspent transaction output set (UTXO set) is calculated.

Ta4j is an open-source Java library for technical analysis. It provides the basic components for the creation, evaluation, and execution of trading strategies. Ta4j is available on Maven Central. You can also download example code from the maven central repository. The wiki is the best place to start learning about ta4j. For more detailed questions, please use the issues tracker. We can calculate indicators over this bar series, in order to forecast the direction of prices through the study of past market data. Then we have to build our trading strategy. It is made of two trading rules, one for entry, the other for exit. Ta4j comes with a set of basic trading rules/strategies which can be combined using boolean operators. Trading strategies can be easily compared according to a set of analysis criteria. Ta4j can also be used for live trading with more complicated strategies.

Cryptonose is a desktop application tracking significant price changes and giving an alerts for crypto markets in real-time. It's helpful if you are a daily trader and want to know instantly if something interesting is happening on your exchange. Cryptonose keeps real-time connection with supported exchanges (Binance, Bitfinex, Huobi, KuCoin and Poloniex, also a DEX: Uniswap V3 is supported). It gives instant notifications about a significant price changes, which is helpful in daily trading - you can react to a price change in seconds. It supports desktop notifications and can run web browser with cryptocurrency market for your exchange.

Utilities for accessing blockchains of various cryptocoins. Java API for fetching data from Blockchains.

O3 Wallet is java based Bitcoin Wallet software built on BitcoinJ. We are heavily focused on design and use cases. Note: We are not uploading new versions here. Follow our website for latest version!!

Classpy is a GUI tool for investigating Java class file, Lua binary chunk, Wasm binary code, and other binary file formats. Understands class files described by JVMS9. Supports Lua 5.3 binary chunk format. Supports Wasm binary format. Supports Bitcoin raw block and transaction format. Displays parsed binary file as tree and hex text. The corresponding hex text is highlighted when you select a tree node. This tool is mainly inspired by javap and JavaClassViewer.