Open. The site's label is OPEN (page last edited 2026-04-07, proof-claims tab accessed 2026-10-06). The tab carries one full proof claim, submitted 2026-07-25 by Rafik Zeraoulia with a write-up on Zenodo; its own summary describes the work as partial progress and not a proof, so it is recorded as withdrawn below a proof on its claim page (Zeraoulia, 2026) and the standing takes nothing from it.