What was the decentralized OAuth approach? Are you referring to OpenID?<p>If so, the difference is that Persona works with whatever email address&#x2F;account the user already owns, just like plain email&#x2F;password authentication; they don&#x27;t have to figure out that they need to create an account in some &quot;identity provider&quot;, which then gives them an URL to copy-paste into the site.