This makes identity proofs publicly verifiable – instead of having to trust that the service is being truthful, a user can find and check the relevant proof statements themselves, and the Keybase client does this automatically. Instead of using a system such as OAuth, identities are proven by posting a signed statement as the account a user wishes to prove ownership of. Keybase allows users to prove a link between certain online identities (such as a Twitter or Reddit account) and their encryption keys.
On May 7, 2020, Keybase announced it had been acquired by Zoom, as part of Zoom's "plan to further strengthen the security of video communications platform". In general, Keybase allows for any service with public identities to integrate with Keybase. Keybase has supported Coinbase identities since initial public release, but ceased to do so on March 17, 2017, when Coinbase terminated public payment pages.
It also supports Bitcoin, Zcash, Stellar, and QRL wallet addresses. Keybase supports publicly connecting Twitter, GitHub, Reddit, Hacker News, and Mastodon identities, including websites and domains under one's control, to encryption keys. Files placed in the public portion of the filesystem are served from a public endpoint, as well as locally from a filesystem mounted by the Keybase client. Additionally it offers an end-to-end encrypted chat and cloud storage system, called Keybase Chat and the Keybase Filesystem respectively.
Keybase is a key directory that maps social media identities to encryption keys (including, but not limited to PGP keys) in a publicly auditable manner.
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