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https://www.livebitcoinnews.com/berlin-next-month-unchain-convention-2019-will-set-up-a-get-together-with-state-of-the-art-crypto-voices-again-amongst-others-tone-vays-and-brock-pierce/
Berlin: Next Month Unchain Convention 2019 Will Set up a Get-Together with State of the Art Crypto Voices Again, Amongst Others Tone Vays and Brock Pierce