Is Auth0 the right solution for me - Plugin for comments on other sites

Hello everyone,

I am trying to build a small widget for sites to integrate, similar to Disqus , or basically a typical comment’s on other people’s articles system.

What I am trying to understand is, a user logs in to my system, when it’s hosted on another website, should I not have a bit more control over that site, and potentially setup some CNAMES for allowing first-party cookies to be set, therefore trying to achieve users persistance.

Or is there an easier solution, for my multi tenancy plugin app, where they could remain logged in with a third party cookie on others people websites, and probably not have to re-login as they travel across the network, with all different domains involved?

Thank you in advance