> 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. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://base-tech.gitbook.io/base/8.-practice-projects.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.