bitcoinjavalib

Porting the code from this book to another language would also be a great learning tool.

writes Jimmy Song in Programming Bitcoin ¹ on page 250.
So this is a Java implementation of it.

As this is the most popular application of Bitcoin, creating a wallet will give you a lot of insight into users' needs.

writes Jimmy Song in Programming Bitcoin ¹ on page 249.
So there is also a wallet, based on the Electrum protocol, included.

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maven central

release notes

run tests with maven

mvn clean test  
mvn test -Dtest=Chapter7Test
mvn test -Dtest=Chapter7Test#exercise4

run network tests

• network tests work only with a peer @ localhost

mvn test -Dnetwork=true
mvn test -Dtest=SimpleNodeTest#handshake -Dnetwork=true
mvn test -Dtest=Chapter10Test#example2 -Dnetwork=true

run disabled tests

mvn test -Dtest=Chapter7Test#verifyBiggestTransaction -Ddisabled=false

Footnotes

1. Programming Bitcoin by Jimmy Song (O'Reilly). Copyright 2019 Jimmy Song. 978-1-492-03149-9. ↩ ↩²