Passkeys on cryptocurrency wallets such as the Trezor and Ledger are tied to the device's seed phrase and can be backed up.

▲

baobun 9 days ago | parent [-]

Did you try that? I can't find any confirmation on if it's actually working for classical keys but it's for sure not supported for resident keys on Ledger.

https://www.ledger.com/blog/strengthen-the-security-of-your-...

https://github.com/LedgerHQ/app-security-key/issues/6

https://github.com/LedgerHQ/app-security-key/issues/7

Is Trezor implementation more mature?

	▲	AgentME 9 days ago \| parent [-]
		Damn I misremembered, I've only tried it on Trezor, not Ledger. What I do know is I've successfully used my Trezor for signing in to Google and several other sites through one or both of Chrome or Firefox.