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An answer is a momentum-resolved or phase-sensitive gap measurement plus a model reproducing $T_c \\sim 80\\,\\mathrm{K}$.","problem_ref":null,"references":"","settled_by":"ARPES or quasiparticle interference on superconducting films resolving gap magnitudes and signs on each Fermi sheet, matched by a model calculation of $T_{\\mathrm{c}}$.","status_note":"Gap-symmetry measurements reported in 2025, including a d-wave claim under pressure, have not converged.","title":"Gap symmetry and pairing mechanism of bilayer 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