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In order to maintain proof, Keybase regularly checks to ensure verifications still exist. Furthermore, all of the Keybase information is stored on a bitcoin address as unspent transactions, creating public proof that anyone can see via the block chain.

“Anyone can write a client that polices Keybase,” said Coyne. “And if it ever catches a lie, it will be provable, since all these statements are signed by Keybase, with its public key.”

— http://www.coindesk.com/keybase-project-plans-make-cryptography-easy-twitter/