Perhaps a non-shitcoin custody use case for MPC actually.

Yeees, that would be killer, right? Because now I'm a bit scared every time I am putting in my private key into amethyst, astral, or whatever.

You can implement it as MuSig. Your second factor is just another signer in a 2-of-2.

I'm not sure that the relays are ready to retrieve multisig. Anyways it shines really promising. What I thought was to put all relays on a chain (bitcoin or sidechain) so they add some crucial data simultaneously. For example, if the user wants to have 2FA - this data would be added to the next block so all relays accept messages from this user only signed with 2FA.

Anyways, we need 2FA 🚀 #[1]