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Make a convenience ECKey.decrypt(KeyParameter) that doesn't require the keycrypter to be manually specified, as often (always?) the key knows it already. Introduce a KeyBag interface that just contains findKeyBy* methods, then make Wallet implement it and change Transaction.signInputs to use it. Take out the encrypted-key specific stuff here: Transaction now requires unencrypted keys. Create a DecryptingKeyBag class that just forwards calls to Wallet and decrypts the returned keys. This decouples the signing code from Wallet a bit. Should be all API compatible.
To get started, ensure you have the latest JDK installed, and download Maven from: http://maven.apache.org/ Then run "mvn clean package" to compile the software. You can also run "mvn site:site" to generate a website with useful information like JavaDocs. The outputs are under the target/ directory. Alternatively, just import the project using your IDE. IntelliJ has Maven integration once you tell it where to find your unzipped Maven install directory. Now try running one of the example apps: cd examples mvn exec:java -Dexec.mainClass=com.google.bitcoin.examples.ForwardingService -Dexec.args="<insert a bitcoin address here>" It will download the block chain and eventually print a Bitcoin address. If you send coins to it, it will forward them on to the address you specified. Note that this example app does not use checkpointing, so the initial chain sync will be pretty slow. You can make an app that starts up and does the initial sync much faster by including a checkpoints file; see the documentation for more info on this. Now you are ready to follow the tutorial: https://code.google.com/p/bitcoinj/wiki/GettingStarted