Fortress proposes bulletin-board-free transparency logs via social graphs
Each epoch users share one directory view or an honest user emits a public proof of misbehaviour, with rare out-of-band contact.
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Each epoch users share one directory view or an honest user emits a public proof of misbehaviour, with rare out-of-band contact.

Signal adds automatic key verification, a key-transparency system audited by Cloudflare and Trail of Bits that detects key-directory tampering in E2EE chats.
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