> For the complete documentation index, see [llms.txt](https://base-tech.gitbook.io/base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://base-tech.gitbook.io/base/8.-practice-projects.md).

# 8. Practice projects

This chapter includes three practice projects to improve your skills. They cover various concepts and features related to BigBang.

The time-locked wallet project offers an excellent introduction to how blockchains evolve over time. You will use the block height (the length of the chain) to create a contract that unlocks after a certain amount of time has passed. The smart-claimant is a follow-up project that demonstrates how inter-contract calls function and how you can build on top of other smart contracts. The multi-signature vault project teaches how to build a basic voting mechanism and iterate over sequences.