Source
Sources are the evidence layer of a signal. Each one is a URL plus a verdict (supports, contradicts, unrelated, or unreachable) and an optional snippet. Source verdicts are what drive a signal’s grounding state.
Verdicts
Supports: the page substantively backs the signal. Contradicts: the page argues against it. Unrelated: the page does not bear on the claim. Unreachable: the page could not be fetched at evaluation time.
Adding sources by hand
You can paste sources directly onto a signal at any time. New sources land with no verdict; the next source-and-verify run judges them. You can also delete or replace sources manually.
How sources count
Only contributing sources drive grounding state: supports for a verified signal, contradicts for a rejected one. Unrelated and unreachable sources are recorded for transparency but do not move the verdict.