Build provenance

<div class="sd"><div class="sd-head"><strong>BUILD PROVENANCE</strong><span id="state">live check</span></div><div class="sd-stage"><div class="bp-record"><span>source <b>rev 42</b></span><span>builder <b>trusted</b></span><span>digest <b>7A3F</b></span></div><div class="bp-check">↔</div><div class="bp-artifact" id="artifact">artifact<br><b id="hash">7A3F</b></div></div><div class="sd-foot"><span id="caption">checking boundary</span><span>tap to step</span></div></div>

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let n=-1;function advance(){n=1-n;document.getElementById('hash').textContent=n?'91C0':'7A3F';document.getElementById('artifact').classList.toggle('mismatch',!!n);document.getElementById('state').textContent=n?'digest mismatch':'provenance verified';document.getElementById('caption').textContent=n?'release gate rejects altered artifact':'source + builder + digest match'}advance();setInterval(advance,1050);
document.querySelector('.sd').addEventListener('pointerdown',advance);