This repository contains a time-stamped, falsifiable a priori prediction derived from the Unified Applicable Time (UAT) and Unified Causal Principle (UCP) frameworks. The prediction is based on an 8‑coil perimeter array with a central observer coil, driven at a phase step of 43.515° (the quantum brake correction of the classical 45° step via k_early = 0.967). The expected residual amplitude at the centre is 0.279182 (normalised), yielding an RMS of ~0.1974 (with a 7% thermal margin). Two specific predictions are registered for the temporal window 15 August 2026 ± 3 days (12–18 August 2026): Prediction A (Laboratory): The central coil RMS will exceed 0.20 for at least 10 continuous minutes, and the Pearson correlation with the ideal 8‑phase template (43.515°, 232.04 Hz) will be greater than 0.95. Prediction B (Astrophysical): Publicly available LIGO Livingston (L1) O5 strain data will show an excess of phase coherence in the 230–234 Hz band, with a correlation peak >0.95 against the same template, at a significance >3σ over background. The prediction is sealed with a SHA256 hash of the accompanying PDF, establishing temporal precedence before the August 2026 window. The repository includes the full prediction document (PDF), its LaTeX source, and a Python verification script that reproduces the hash and prints the prediction. Success or failure of these tests will provide decisive evidence for or against the UAT/UCP frameworks. Related DOIs: UAT Framework: 10.5281/zenodo.17729221 UPC Framework: 10.5281/zenodo.17718670 UAT Tensions (Hubble, S8, Age): 10.5281/zenodo.20534633 UAT Technical Limitations: 10.5281/zenodo.20534771 Author: Miguel Ángel Percudani (Puan, Buenos Aires, Argentina)License: Creative Commons Attribution 4.0 International (CC BY 4.0)