> For the complete documentation index, see [llms.txt](https://seb.stanfordblockchain.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://seb.stanfordblockchain.xyz/extensibility-layer.md).

# Extensibility Layer

- [Extensibility Layer Overview](https://seb.stanfordblockchain.xyz/extensibility-layer/extensibility-layer-overview.md)
- [Lightning Network](https://seb.stanfordblockchain.xyz/extensibility-layer/lightning-network.md)
- [Smart Contract Protocols](https://seb.stanfordblockchain.xyz/extensibility-layer/smart-contract-protocols.md)
- [Bitcoin Rollups](https://seb.stanfordblockchain.xyz/extensibility-layer/bitcoin-rollups.md)