Development Highlights

• Test First – This project was written predominantly with a test-first approach. Write a failing test, write minimal code to make that test pass, and then do any desired refactorings because the tests provide confidence.

• Functional Core, Imperative Shell – Keep the parts on the "inside" of the program as pure and immutable as possible and only use impure, side-effecting procedures at the "boundaries".

• Live Coding – At least part of this project was streamed on twitch with archives uploaded to youtube.

• Proof-of-Work (HashCash)

• Account model of state (as opposed to Bitcoin's UTXO)

Dependencies

• scala
• sbt
• docker
• docker-compose

Testing

• sbt
  • resourceGeneration/run
  • testOnly -- -l DockerComposeTag (Run non-docker tests)
  • dockerComposeTest

Work in Progress and full of vulnerabilities!

• Docker testing is very new and some tests intermittently fail. I'm currently making it more robust in the peer-discovery branch
• There are many security flaws in the program that I have discovered over time. One fun one is that you can make someone else's node save or load the blockchain on demand over the network!