While there isn't an official way to link your Mastodon account with Keybase, you can prove your identity manually by signing a message with the Keybase CLI. Then, anyone that meets you via the fediverse can communicate with you securely by verifying your signature. There is a good explanation of how to do this at https://ryanmaynard.co/mastodon-keybase
How to Verify Your #Mastodon Account with Keybase https://ryanmaynard.co/mastodon-keybase #freesw
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