Ah yes, I just learned about that in this episode: https://fountain.fm/episode/XlD5eSY0ekb1pjDXAwmU
I haven't listened to that episode again, but it would require a certain amount of transactions to leak the private key right? Still, if that is already on the firmware level then that is bound to happen at some point if the number of transactions required is not too large.
you can perform this attack with a single transaction
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