I can improve your Java code. I improve maintainability and performance, usually reducing lines of code. I can add tests to prove it and document the improvements. 100 lines of your code turned into better Java (1.6) with JUnit tests for 1 bitcoin. I will create a maven 3.0 project to compile and test it. the project will show your code and performance as a starting point. New code that matches the API will be created.