  In the context of an inflationary Randall-Sundrum Type II braneworld (RS2) we
calculate spectral indices and amplitudes of cosmological scalar and tensor
perturbations, up to second order in slow-roll parameters. Under very simple
assumptions, extrapolating next-order formulae from first-order calculations in
the case of a de Sitter brane, we see that the degeneracy between standard and
braneworld lowest-order consistency equations is broken, thus giving different
signatures of early-universe inflationary expansion. Using the latest results
from WMAP for estimates of cosmological observables, it is shown that future
data and missions can in principle discriminate between standard and braneworld
scenarios.
