Samson Mow(@Excellion):The Anti-Exfil protocol also originated from @Blockstream and they developed the first production-ready code for it. Anti-Exfil protects you against private key (or seed) exfiltration via signature nonces. A dishonest hardware wallet can secretly hide tiny pieces of your private key inside the “random” numbers it uses every time it signs a transaction. Over enough transactions, someone watching the public blockchain can put those pieces together, recover your key, and steal your bitcoin - without you ever noticing anything wrong. Only two HWWs have this implemented: @BlockstreamJade @BitBoxSwiss (they call it Anti-Klepto) @Blockstream and @adam3us have been protecting you from this class of attacks since 2021.

2026.08.06 23:08

The Anti-Exfil protocol also originated from @Blockstream and they developed the first production-ready code for it. Anti-Exfil protects you against private key (or seed) exfiltration via signature nonces. A dishonest hardware wallet can secretly hide tiny pieces of your private key inside the “random” numbers it uses every time it signs a transaction. Over enough transactions, someone watching the public blockchain can put those pieces together, recover your key, and steal your bitcoin - without you ever noticing anything wrong. Only two HWWs have this implemented: @BlockstreamJade @BitBoxSwiss (they call it Anti-Klepto) @Blockstream and @adam3us have been protecting you from this class of attacks since 2021.

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