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A replacement object with the properties bootstrap methods need has not been established.","posed_since":"","precise":"For 4D theories with massless gauge bosons or gravitons, define nonperturbatively asymptotic observables (dressed amplitudes, Faddeev-Kulish states, or inclusive cross sections) that are infrared finite and obey unitarity, analyticity and crossing in a form usable for numerical bootstrap. An answer is such a definition with proofs of these properties, or a demonstration that one of them must fail.","problem_ref":null,"references":"","settled_by":"A definition with nonperturbative proofs of unitarity, analyticity and crossing, used in a working numerical bootstrap.","status_note":"Generalized crossing relations between different asymptotic observables were proven at tree level in 2023 (Caron-Huot, Giroux, Hannesdottir, Mizera, arXiv:2310.12199).","title":"Bootstrap-ready scattering observables with soft photons and 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