@xssfox simple idea/ thought exp:
A universal cross-reference lookup site.
Plug in the twitter address: it spits out the mastodon address (and vice versa)
Self-Verification is performed by … (brain gears grind…)
Something like a specific cross referenced tweet/toot that has matching text/string etc - provide the url for both - the “machine” checks it out and if all good - it goes into the DB.
No particular traces left on twitter in “violation”.