post introduces WebAuthn sample application updates the EOSIOTools feature article with a WebAuthn sample application that shows developers how to integrate WebAuthn in a project to facilitate two-factor authentication (2FA) using devices such as YubiKey when signing transactions. This article explains why WebAuthn 2FA is adopted and how it works. At the same time, said: EOSIO's support for WebAuthn is a step forward for blockchain applications to take a more secure / seamless authentication.