Moxie Marlinspike, the co-founder and chief executive of encrypted-messaging app Signal, has resigned. He blogged it was a "good time to replace myself as CEO" after working on Signal for over a decade. Signal recently enabled crypto-currency payments within the app, which has concerned some users. Mr Marlinspike remains a board member of the Signal Foundation, while the board's executive chair, Brian Acton, becomes interim chief executive.

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