> For the complete documentation index, see [llms.txt](https://docs.zklink.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zklink.io/architecture.md).

# architecture

- [Overview](https://docs.zklink.io/architecture/overview.md)
- [Transaction Life Cycle](https://docs.zklink.io/architecture/transaction-life-cycle.md)
- [Sequencing Layer](https://docs.zklink.io/architecture/sequencing-layer.md)
- [Execution Layer](https://docs.zklink.io/architecture/execution-layer.md)
- [Settlement Layer](https://docs.zklink.io/architecture/settlement-layer.md)
- [In-Detail: Multi-Chain State Synchronization](https://docs.zklink.io/architecture/settlement-layer/in-detail-multi-chain-state-synchronization.md)
- [In-Detail: Contract System on Primary Chain](https://docs.zklink.io/architecture/settlement-layer/in-detail-contract-system-on-primary-chain.md)
- [DA Layer](https://docs.zklink.io/architecture/da-layer.md)