  We sum up two- and three-point amplitudes in the chiral higher-spin theory
over helicities and find that these quite manifestly have the form of invariant
traces of the flat space chiral higher-spin algebra. We consider invariant
traces of products of higher numbers of on-shell higher-spin fields and
interpret these as higher-point scattering amplitudes. This construction
closely mimics its anti-de Sitter space counterpart, which was considered some
time ago and was confirmed holographically.
