Activity Pub has created a new way to build platforms for sharing content. However, Mastodon is a social interaction network with a huge influx of new users Twitter. The new users are trying to learn the difference in acceptable behaviours and practices.
One of the big differences is you cannot be verified. Since there is no central authority on the fediverse, there is not way to verify identities.
"But what if I am a big deal? How will people know I'm the real me?"
Here's a solution. You're Big Name. You own bigname.com and your fans know it. You can host your own single-user Mastodon instance at iam.bigname.com so that you can be [email protected] for your full handle.
Besides, if you're actually a big deal, then you can probably get someone to help you set up your own instance, right?
If you're interested in joining the fediverse by joining Mastodon, check out joinmastodon.org to find the right instance for you.
You can find me at [email protected] where I am a co-admin.