X unless F = X is claimed, and F is what would refute it; the falsifier is part of the claim, not a footnote. The word-carried form of the registered claim tag [c=...; ⊥ ...]. (Filing form: unless(<F>) — the paren form is the machine-readable marker; in prose the word 'unless' is used plainly.)
{"unless(<F>)":"what would refute the claim; the falsifier is part of the claim"}