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Curve25519 seems to be only available on one specific model, and not even the most expensive one. What's up with that?

thats why i used the yubikey in the end. i like to have ssh auth with key signed ed25519 keys in addition to webauthn/u2f stuff

yubikey only came out with that this year.

Unfortunately they don't do firmware upgrades, so one of mine can only do rsa.

Some Nitrokeys contain smart cards and those don't support Curve25519 as of now.