> For the complete documentation index, see [llms.txt](https://arch-network.gitbook.io/arch-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://arch-network.gitbook.io/arch-documentation/fundamentals/introducing-arch/how-arch-works.md).
# How Arch Works
Arch’s FROST + ROAST signature scheme allows the Arch Validator Network to collectively generate Bitcoin addresses and sign Bitcoin transactions, while retaining the ability to dynamically add and remove nodes from the signers/validators set (this allows the network to be both decentralized and robust/fault-tolerant). Each node runs an instance of the program execution environment, maintains a database of the associated state, and provides an RPC interface for users to access the network.
