The Mt Gox Yubikeys are hard to beat. Really hard if you’ve also got a 1 time password generator card to pair w the Yubikey. These are rare as fck. Article from 2013 announcing the sale of them, 39 USD..pretty sure I could have spared that amount for one of these.
https://www.coindesk.com/markets/2013/11/28/bitcoin-exchange-mt-gox-adds-extra-security-with-one-time-password-card/amp/Anyone have one they can show off? just curious if any of these exist outside the whales of yesteryears like GP and Blazed. Spent years hunting for one. No luck.

If I understand correctly, Piper is still a legitimately made/secure paper wallet generator (if working) to this day, no?