How about something more fundimental. Consider bitcoin wallet M, that erases the private keys after n transactions? Either you trust your wallet does not do th

How about something more fundimental. Consider bitcoin wallet M, that erases the private keys after n transactions? Either you trust your wallet does not do this, or you make copies and trust location/security/something else. Trustless is a misnomer and was originally applied in the context of 3rd parties, nor computational devices in your own control running code you can theoretically verify.