Comment by AgentME
4 months ago
Some cryptocurrency hardware wallets such as Trezor's are usable exactly how you want: they support fido2/webauthn and derive their keys from the recovery seed phrase. You can write down the recovery seed phrase, initialize other hardware wallets with the same recovery seed later on, and they will present to a computer as the same fido2/webauthn token.
If it's hardware it can break or be lost or stolen.
As I said, you can write down the recovery seed and initialize other security keys from it, so you're able to deal with a hardware wallet breaking, unlike most fido2/webauthn security keys. Hardware wallets also require a pin to be entered, so they're more secure against being lost or stolen too than security keys that don't need a pin.