Verification
A verdict you can trace back to evidence.
Check a defined claim against an authoritative source and an explicit rule.
What establishes the answer?
Identify the entity, period, units, and source record. Preserve the source reference and relevant evidence alongside the reference answer and grading rule.
How we work
Separate contradictions from unavailable evidence and unsupported questions. A source timeout is not a false claim; a real citation is not proof that a document supports the answer.
Scope and limits
Verification is bounded by the source and check. Publication metadata does not establish scientific entailment, and a historical source snapshot is not a current recheck.