Interesting! Does the WebAuthn API provide enough of a cryptographic basis to fulfill the needs of cryptocurrency wallets?

I know it works through public/private key sharing but I wasn't aware that it provides such direct primitives.

It doesn't, at least not for generic/unmodified cryptographic applications.

WebAuthN signatures are of a very specific challenge/response format [1] that applications need to explicitly support. For example, SSH had to add new key and signature formats [2] to support it.

Theoretically, a blockchain/cryptocurrency application could adopt the WebAuthN signature format as its canonical or an alternative signature format, but I'm not aware of any popular one having done so.

[1] https://developers.yubico.com/WebAuthn/Concepts/Using_WebAut...

[2] https://github.com/openssh/openssh-portable/blob/master/PROT...

Thank you for explaining!

Yes, but WebAuthN can't be used for arbitrary signatures (which would be required to support various cryptocurrencies/blockchains), nor can it be used to decrypt data or derive keys, which would allow using it as an unlocking key for some hybrid solution.

I'm happy to be proven wrong if you've found a way around these fundamental constraints!