I've always thought that Bitcoin multisig was the best implementation of 2FA. 2 of 3 keys, one you keep hot, one pay someone to hold and sign/log on your behal

I've always thought that Bitcoin multisig was the best implementation of 2FA. 2 of 3 keys, one you keep hot, one pay someone to hold and sign/log on your behalf (and let you know if something seems off) and one you file away in case the person you're paying to co-sign with you disappears...