Bootstrapping String Theory: From Minimal Constraints to a Unique High-Energy Description

A bootstrap analysis shows that, under ultrasoft high-energy behavior and the assumption that Regge zeros are the only zeros, the 4- and 5-point scattering amplitudes for identical scalars are uniquely fixed to the string-theory form, implying string dynamics may emerge from fundamental consistency principles rather than being assumed a priori. Built on Lorentz invariance, crossing symmetry, positivity, and analyticity, the result supports string universality but depends on whether these inputs can be independently justified or if other assumptions yield the same outcome.