Signed. Timestamped. Checkable by anyone.
What a signature proves: these claims and transcript hash were presented to the signing service at the stated time and have not been altered since. What it doesn't prove: that the run was proctored — arenas run on the honor model, and transcripts are the receipts.
Reads your local results (Charter, Gym best, Exam) — nothing is sent anywhere until you click, and then only the claims below.