Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging tools such as email, Twitter or Telegram, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. If the Internet's down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the Internet's up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.
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Torsten Grote
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Like other recursive operations on the dependency graph, this is not done in a single transaction to prevent an attacker from creating arbitrary large transactions. So at startup, the `ValidationManager` finds and resumes any unfinished operations, by looking for shared messages with unshared dependencies.