Seems like you could get around that with a meta tag on the claimed site? Meta tags are basically never commenter-editable, and are usually owner-editable, the

Seems like you could get around that with a meta tag on the claimed site? Meta tags are basically never commenter-editable, and are usually owner-editable, they're basically a perfect fit for this. Alternatively there's a site/.well-known/keybase style URL (I have no idea what the best-practices are for .well-known. Personally I prefer meta tags.) Obviously Twitter isn't likely to implement either of those, so some high-value custom implementations are still great. But if Maria owns maria.com and can assert it automatically, that's pretty strong supporting evidence.