Bitcoin Java

Bitcoinj (often styled as bitcoinj) is a Java-based software library that implements the Bitcoin network protocol and enables developers to build wallets, light clients, and related applications within the Java ecosystem. It supports SPV mode, wallet management, transaction creation, and various contract-related features, and is used by a range of projects written in Java and other JVM languages. The project was developed as an open-source effort, with leadership historically associated with Mike Hearn during his time at Google, and its codebase and documentation are maintained through its official site (bitcoinj.org) and GitHub repositories. (bitcoinj.org)

Notes:

• The referenced site in your query (http://www.bitcoinjava.com) does not appear to be an active, official home for the bitcoinj project as of the current records. The primary information and sources pertain to bitcoinj itself, not a separate entity named “Bitcoin Java.” (bitcoinj.org)