Watch or read a tutorial on how to customise it and build a native installer that does not require Java. A simple GUI wallet app that you can use as the basis for your own apps.Easily implement apps that use Bitcoin's contracts features.Provides both async and thread-per-connection for network IO, allowing you to choose between scalability and blocking-only features like SOCKS proxying.Support for micropayment channels that let you set up a multi-signature contract between client and server, and then negotiate on the channel, allowing fast micropayments that avoid miner fees.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.In this mode, the unspent transaction output set (UTXO set) is calculated and, thanks to a PostgreSQL store, can be indexed into a database allowing for fast lookup of balance by address. Experimental full verification mode, which does the same verification work as Bitcoin Core.In this mode, only a small part of the block chain is downloaded, making bitcoinj suitable for usage on constrained devices like smartphones or cheap virtual private servers. Highly optimised lightweight simplified payment verification (SPV) mode.It comes with full documentation and many large, well known Bitcoin apps and services are built on it. It's implemented in Java but can be used from any JVM compatible language: examples in Python and JavaScript are included. It can maintain a wallet, send/receive transactions without needing a local copy of Bitcoin Core and has many other advanced features.
Bitcoinj is a library for working with the Bitcoin protocol.
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