diff --git a/blog/deciding-well-solved/index.html b/blog/deciding-well-solved/index.html
index a615f3d..c77d981 100644
--- a/blog/deciding-well-solved/index.html
+++ b/blog/deciding-well-solved/index.html
@@ -524,6 +524,6 @@ <h3 class="mono" id="rests-experiences" data-de="Erfahrungen">Experiences</h3>
 <script src="../../page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
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diff --git a/blog/deciding-well-solved/og.sha b/blog/deciding-well-solved/og.sha
index 99f7f7b..c626cfb 100644
--- a/blog/deciding-well-solved/og.sha
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@@ -1 +1 @@
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diff --git a/blog/index.html b/blog/index.html
index a90c229..6bb7625 100644
--- a/blog/index.html
+++ b/blog/index.html
@@ -406,6 +406,6 @@ <h1 data-de="<span class='r70'>Texte über</span><span class='rcl'><em>gutes Ent
 <script src="../page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
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diff --git a/blog/og.sha b/blog/og.sha
index 7b51d4b..3c8227c 100644
--- a/blog/og.sha
+++ b/blog/og.sha
@@ -1 +1 @@
-d8d2d0236d1e96fd2d60a17d1cec7b5f67d23278b2f1d263f3853fe36704d72c
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diff --git a/blog/one-question-answered/index.html b/blog/one-question-answered/index.html
index 65be049..690e49c 100644
--- a/blog/one-question-answered/index.html
+++ b/blog/one-question-answered/index.html
@@ -515,6 +515,6 @@ <h3 class="mono" id="rests-pages" data-de="Seiten">Pages</h3>
 <script src="../../page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
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diff --git a/blog/one-question-answered/og.sha b/blog/one-question-answered/og.sha
index d3eda9a..4094809 100644
--- a/blog/one-question-answered/og.sha
+++ b/blog/one-question-answered/og.sha
@@ -1 +1 @@
-257e18bf075482157c293ea9b3a6db58e70dc05c1e64cb27c6d3d73f2a2183c3
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diff --git a/ideas/index.html b/ideas/index.html
index eb2edd2..cb814bb 100644
--- a/ideas/index.html
+++ b/ideas/index.html
@@ -680,6 +680,6 @@ <h3 data-de="Der gehostete Dienst">The hosted service</h3>
 <script src="../page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/ideas/og.sha b/ideas/og.sha
index cd8afed..895547d 100644
--- a/ideas/og.sha
+++ b/ideas/og.sha
@@ -1 +1 @@
-6cc6d36fd8cb8315f67ff9544c5711053bd4ad10c2400f7ccbace970f19bf2a6
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diff --git a/index.html b/index.html
index b236914..a55a880 100644
--- a/index.html
+++ b/index.html
@@ -493,6 +493,6 @@ <h2 data-de="Fünf Werte – und zu jedem, <em>was ich nie tue</em>.">Five value
 <script src="page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/model/index.html b/model/index.html
index e262289..87e1b6b 100644
--- a/model/index.html
+++ b/model/index.html
@@ -511,6 +511,6 @@ <h2 data-de="Die Datei hinter dem Diagramm">The file behind the figure</h2>
 <script src="../stage.js"></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/model/og.sha b/model/og.sha
index f29f4b9..0a2443a 100644
--- a/model/og.sha
+++ b/model/og.sha
@@ -1 +1 @@
-cfbcc2e0d465567e46d201926f3634d4e77f6deb01dcdd52d8036c9958bd4f6e
+e90299e6c3e163cfb978d2d596961a041419b224a4f8d10d45bd360f92684191
diff --git a/og.sha b/og.sha
index 321a99e..2e1d4bc 100644
--- a/og.sha
+++ b/og.sha
@@ -1 +1 @@
-6e2e331d50e0334f7b668306e5a0bb1426783f1a53a17b88d213b77c0fe2e196
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diff --git a/principles/index.html b/principles/index.html
index 4c5ccf9..d109610 100644
--- a/principles/index.html
+++ b/principles/index.html
@@ -471,6 +471,6 @@ <h3 data-de="Die Produktion ist das Ziel">Production is the finish line</h3>
 <script src="../page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/principles/og.sha b/principles/og.sha
index 05daf35..95c7043 100644
--- a/principles/og.sha
+++ b/principles/og.sha
@@ -1 +1 @@
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diff --git a/privacy/index.html b/privacy/index.html
index 9278cec..9cb962a 100644
--- a/privacy/index.html
+++ b/privacy/index.html
@@ -322,7 +322,7 @@ <h3 data-de="Gar nicht verwendet">Not used at all</h3>
             <li><b data-de="Cookies">Cookies</b><i data-de="Keinerlei. Es gibt kein Banner, weil es nichts gibt, dem Sie zustimmen müssten.">None, of any kind. There is no banner because there is nothing to consent to.</i></li>
             <li><b data-de="Statistik und Tracking">Analytics</b><i data-de="Nichts zählt Ihre Besuche, und niemandem wird gemeldet, dass Sie hier waren.">Nothing counts you, and nobody is told that you were here.</i></li>
             <li><b data-de="Anfragen an Dritte">Third-party requests</b><i data-de="Schriften, Bilder und Stylesheets kommen alle von dieser Domain. Kein CDN sieht Ihre IP-Adresse. Die einzige Ausnahme ist der Chat, sobald Sie auf Senden drücken. Wohin Ihre Nachricht geht, zeigt das Diagramm <a href='#lineage'>Wohin Ihre Daten gehen</a>.">Fonts, images and styles all come from this origin. No CDN sees your address. The one exception is the chat, once you press send; where your message goes is drawn under <a href="#lineage">Where your data goes</a>.</i></li>
-            <li><b data-de="Formulare und Konten">Forms and accounts</b><i data-de="Nichts auszufüllen, keine Anmeldung, nichts zu speichern.">Nothing to fill in, nothing to sign up for, nothing to store.</i></li>
+            <li><b data-de="Formulare und Registrierung">Forms and sign-ups</b><i data-de="Nichts auszufüllen und nichts, wofür man sich registrieren könnte. Ein Konto für den Chat gibt es nur auf Einladung, wie unten beschrieben.">Nothing to fill in and nothing to sign up for. An account for the chat comes only by invitation, as described below.</i></li>
             <li><b data-de="Wiedererkennung">Fingerprinting</b><i data-de="Es wird nicht versucht, Sie über Besuche hinweg wiederzuerkennen. Die gespeicherte Sprachwahl ist keine Kennung.">No attempt is made to recognize you across visits. The language key is not an identifier.</i></li>
           </ul>
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@@ -384,7 +384,7 @@ <h2 data-de="Was hier sonst noch passiert">What else happens here</h2>
       <p class="lede" data-de="Nichts. Diese Website verkauft nichts, misst nichts und lässt nichts im Hintergrund laufen – sie zeigt Vorträge und was ich tue.">Nothing. This site sells nothing, measures nothing and runs nothing in the background — it shows talks and what I do.</p>
       <div class="rules">
         <p data-de="<b>Die Vorträge sind Dateien.</b> Die Präsentationen und die PDFs liegen auf dieser Domain und werden von hier ausgeliefert. Kein eingebettetes Video, kein Player, der Verbindung zu anderen Servern aufnimmt."><b>The talks are files.</b> The decks and the PDFs sit on this domain and are served from here. No video embed, no player phoning somewhere else.</p>
-        <p data-de="<b>Es gibt kein Formular und kein Konto.</b> Nichts auszufüllen, keine Anmeldung – also auch nichts, was gespeichert werden könnte."><b>There is no form and no account.</b> Nothing to fill in, nothing to sign up for — so nothing that could be stored.</p>
+        <p data-de="<b>Ein Konto gibt es nur auf Einladung.</b> Wen ich einlade, kann sich im Chat anmelden und das Modell wählen, das antwortet. Das Konto liegt bei id.blust.ch, in Zürich, mit Name und E-Mail-Adresse. Von einer angemeldeten Person bewahrt der Chat nur den Zähler des laufenden Monats auf, unter einem Schlüssel, aus dem er nicht auf das Konto zurückschliessen kann. Die Zeile, die er zu jeder Frage aufbewahrt, ist für alle gleich, ob angemeldet oder nicht."><b>An account is by invitation only.</b> A reader I invite may sign in to the chat to choose the model that answers. The account is held at id.blust.ch, in Zurich, with the reader's name and email address. Of a signed-in reader the chat keeps only a count for the month, under a key it cannot turn back into the account. The line it keeps of each question is the same for every reader, signed in or not.</p>
         <p data-de="<b>Wenn Sie mir schreiben, dann direkt mir.</b> Der Kontakt läuft über die Links in der Fusszeile, bei den dort genannten Anbietern. Diese Website selbst empfängt nichts."><b>If you write to me, you write to me.</b> Contact runs through the links in the footer, at the providers named there. This site itself receives nothing.</p>
       </div>
     </section>
@@ -638,6 +638,6 @@ <h2 data-de="Wer das betreibt">Who runs this</h2>
 <script src="../page.js" defer></script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/privacy/og.png b/privacy/og.png
index 1939f20..36e85d8 100644
Binary files a/privacy/og.png and b/privacy/og.png differ
diff --git a/privacy/og.sha b/privacy/og.sha
index 27ec435..34b2451 100644
--- a/privacy/og.sha
+++ b/privacy/og.sha
@@ -1 +1 @@
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diff --git a/processes/index.html b/processes/index.html
index 66c7efa..c8a2358 100644
--- a/processes/index.html
+++ b/processes/index.html
@@ -760,6 +760,6 @@ <h2 data-de="Wie man es liest">How to read it</h2>
 </script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/processes/og.sha b/processes/og.sha
index d83394a..59243f7 100644
--- a/processes/og.sha
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@@ -1 +1 @@
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diff --git a/sitemap.xml b/sitemap.xml
index 4b2c3a0..112f7e5 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -1,19 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
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-  <url><loc>https://blust.ch/talks/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/talks/mental-model/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
-  <url><loc>https://blust.ch/talks/essential-complexity/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
-  <url><loc>https://blust.ch/talks/deciding-well/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
-  <url><loc>https://blust.ch/talks/deciding-well/cost/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.7</priority></url>
-  <url><loc>https://blust.ch/blog/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/blog/one-question-answered/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
-  <url><loc>https://blust.ch/blog/deciding-well-solved/</loc><lastmod>2026-10-14</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
-  <url><loc>https://blust.ch/principles/</loc><lastmod>2026-10-15</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/model/</loc><lastmod>2026-10-15</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/surfaces/</loc><lastmod>2026-10-15</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/processes/</loc><lastmod>2026-10-15</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/timeline/</loc><lastmod>2026-10-15</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
-  <url><loc>https://blust.ch/privacy/</loc><lastmod>2026-10-15</lastmod></url>
-  <url><loc>https://blust.ch/ideas/</loc><lastmod>2026-10-14</lastmod></url>
+  <url><loc>https://blust.ch/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>1.0</priority></url>
+  <url><loc>https://blust.ch/talks/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/talks/mental-model/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
+  <url><loc>https://blust.ch/talks/essential-complexity/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
+  <url><loc>https://blust.ch/talks/deciding-well/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
+  <url><loc>https://blust.ch/talks/deciding-well/cost/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.7</priority></url>
+  <url><loc>https://blust.ch/blog/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/blog/one-question-answered/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
+  <url><loc>https://blust.ch/blog/deciding-well-solved/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
+  <url><loc>https://blust.ch/principles/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/model/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/surfaces/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/processes/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/timeline/</loc><lastmod>2026-10-24</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
+  <url><loc>https://blust.ch/privacy/</loc><lastmod>2026-10-24</lastmod></url>
+  <url><loc>https://blust.ch/ideas/</loc><lastmod>2026-10-24</lastmod></url>
 </urlset>
diff --git a/surfaces/index.html b/surfaces/index.html
index cb516bb..e0431f4 100644
--- a/surfaces/index.html
+++ b/surfaces/index.html
@@ -642,6 +642,6 @@ <h2 data-de="Wie man es liest">How to read it</h2>
 </script>
 
 <!-- The chat: one tag, the design package's widget. It loads nothing and sends nothing until a visitor opens it; the privacy page says what leaves the browser then. -->
-<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
+<script src="../chat.js" data-chat="https://chat.blust.ch/chat" data-issuer="https://id.blust.ch" data-client="396565550639163760" data-org="396557802266514649" data-project="396565550420994416" data-model="/model/" data-questions="/model.json" data-questions-de="/questions.de.json"></script>
 </body>
 </html>
diff --git a/surfaces/og.sha b/surfaces/og.sha
index b7fbfed..1859f6f 100644
--- a/surfaces/og.sha
+++ b/surfaces/og.sha
@@ -1 +1 @@
-1b127db775f46a8fdf3d6656b332c01843873f895e596472b94d03cf4ca2c9f4
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diff --git a/talks/deciding-well/cost/index.html b/talks/deciding-well/cost/index.html
index 37ea651..5fbd5dd 100644
--- a/talks/deciding-well/cost/index.html
+++ b/talks/deciding-well/cost/index.html
@@ -615,6 +615,6 @@ <h3 data-de="Was nicht eingerechnet ist">What this leaves out</h3>
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