Jade has had Anti-Exfil since the beginning.
A compromised hardware wallet can slowly leak your private keys through the nonces in its signatures, even if the keys themselves were generated securely.
Anti-Exfil stops this by using sign-to-contract: Jade cryptographically commits its nonce to random data from your host computer, fully re-randomizing it so no key material can be smuggled out.
Blog written by Andrew Poelstra:
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