I thought we countered that by doing 100 dice rolls... and a passphrase?
Have there been any documented incidents of a “nonce covert channel attack”? How does ColdCard address this?
https://bitbox.swiss/blog/how-almost-all-hardware-wallets-can-steal-your-seed/
Discussion
AFAIK that doesn’t help. It’s about the device generating a non random nonce to slowly leak the private key with each transaction.
In coldcard terms, that leaves
1. Remaining air gapped at all times
2. Generating new keys and moving your coins every few months/years depending on what you estimate 'slowly leak' to be and how many transactions you make.