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

# Abstract

Validity gadgets strives to achieve predictive validity on a dynamically available chain like Bitcoin using a synchronous BFT network. All validators send their view of Bitcoin's recent block and run 2/3 attestations to validate the block. With enough redundancy, any forks in the network should be detected. This allows Twilight to confirm deposits in 2 block time than the widely accepted 6 block time.