A tool that shows only a score cannot tell you why it was wrong when it was wrong. An evidence ledger is a line-by-line record of every signal that took part in the verdict. Its purpose is to let the person reading the conclusion check the conclusion.
The signal's identifier, whether it points towards human or AI, its strength, which analysis level produced it, and where in the file it was read. Because the location is there, you can open the same file in another tool and see it for yourself.
Signals that disagree with the conclusion are kept and shown in their own group. Letting them vanish in the summation turns the ledger into a document that justifies the conclusion. When strong contrary evidence survives, the grade itself is lowered a step and that is stated in words.
The report carries the engine version, the signature-database version, the time of analysis and which trust list was used. Without those, two reports on the same file can reach different conclusions and both look right.
The report with its ledger exports as JSON, Markdown or PDF, and can be passed on as a share link with an expiry. The recipient gets the grounds, not just the conclusion.
This is general guidance, not legal advice. A scan result is a probabilistic assessment, not proof.