@atommac @msh I mean if you want to prove that you really are person XYZ at Twitter you could make a post on Twitter saying "This is really truly me on the fediverse: [link]" and then link to that from your fediverse bio.

Otherwise you can use the already-built-in rel=me thing

@atommac all other alternatives are better. As @darius explained you can include links on your twitter profile or home page, either informally as a regular hyperlink or if possible using a rel=me link. You then link back or put the green check on your mastodon profile and this is verification that the same person or entity has control of both sites.

Years of central Big Social websites has conditioned people to believe we must employ central authorities and brokers to manage our data. Such central entities are not features; they are damage we should route around.