It still has firmware, of course, which cannot be audited -- which makes it exactly as secure as a $40 Yubikey. Perhaps even a little more secure - because a Yu

It still has firmware, of course, which cannot be audited -- which makes it exactly as secure as a $40 Yubikey. Perhaps even a little more secure - because a Yubikey is vulnerable to both Yubico and NXP employees, and U2Fzero is only vulnerable to Atmel. [Both, of course, 3 letter agencies] Is there a similar chip with Curve25519?