> For the complete documentation index, see [llms.txt](https://docs.lightningrails.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lightningrails.com/web-3-blockchain.md).

# Web 3 / Blockchain

- [MetaMask Authentication](https://docs.lightningrails.com/web-3-blockchain/metamask-authentication.md): Sign in with MetaMask (SIWE) using OmniAuth OpenID Connect