diff --git a/README.md b/README.md
index ff150c2..ab2c102 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,9 @@ Lean 4 against models extracted from the actual Rust sources:
 
 **[`main.pdf`](main.pdf)** — fourteen chapters + interlude + three
 appendices, full color, built with LaTeX/TikZ from the sources in this
-repo (`./build.sh`, tectonic, no root needed). No prior Lean or formal
+repo (`./build.sh`, tectonic, no root needed). **Second edition,
+published August 8, 2026** (129 pages; the full publication history is
+printed in the book's front matter). No prior Lean or formal
 methods assumed; high-school algebra and a little programming suffice.
 
 1. **Why Verify?** — the carry bug testing cannot find
diff --git a/check-book.py b/check-book.py
index 4df181f..86d7d42 100644
--- a/check-book.py
+++ b/check-book.py
@@ -69,6 +69,13 @@ def main():
     readme = read(os.path.join(book, "README.md"))
     chdir = os.path.join(book, "chapters")
 
+    # the publication-history block: its CURRENT-edition line is bound to
+    # measurements below; its historical lines are frozen and exempt from
+    # the whole-book claim scans, so strip the span for scanning purposes
+    mhist = re.search(r"% BEGIN PUBHIST.*?% END PUBHIST", main_tex, re.S)
+    pubhist = mhist.group(0) if mhist else ""
+    main_scan = main_tex.replace(pubhist, "")
+
     # ── Phase 0: source hygiene ────────────────────────────────────────────
     print("=== Phase 0: source hygiene ===")
 
@@ -128,12 +135,44 @@ def main():
         bad = [l for l in txt.splitlines() if "??" in l]
         check(not bad, "no unresolved references ('??') in rendered PDF",
               bad[0][:60] if bad else "clean")
-        page_claims = re.findall(r"(\d{2,4}) pages", readme + main_tex)
+        page_claims = re.findall(r"(\d{2,4}) pages", readme + main_scan)
         if page_claims:
             for pc in page_claims:
                 check(int(pc) == pages, f"page-count claim {pc} == built {pages}")
         else:
-            ok("no page-count claim in prose (nothing to bind)")
+            ok("no page-count claim outside the history block (nothing to bind)")
+
+        # publication history: the current-edition line is a live claim
+        med = re.search(r"\\textbf\{(\w+) edition\} --- published "
+                        r"([A-Za-z]+ \d+, \d{4}): (\w+)\s*\n?chapters, "
+                        r"(\d+) pages", pubhist)
+        if not (pubhist and med):
+            fail("publication-history block with parseable current-edition line",
+                 "missing" if not pubhist else "line not parseable")
+        else:
+            check(WORDS.get(med.group(3)) == n_ch,
+                  "current edition's chapter count == measured",
+                  f"{med.group(3)} vs {n_ch}")
+            check(int(med.group(4)) == pages,
+                  "current edition's page count == built PDF",
+                  f"{med.group(4)} vs {pages}")
+            # committed PDF must carry the current-edition line: this is what
+            # a GitHub visitor downloads, and it must not lag the sources
+            if os.path.isdir(os.path.join(book, ".git")):
+                blob = subprocess.run(["git", "-C", book, "show", "HEAD:main.pdf"],
+                                      capture_output=True)
+                tmp = os.path.join(book, ".committed-main.pdf.tmp")
+                with open(tmp, "wb") as fh:
+                    fh.write(blob.stdout)
+                ctxt = subprocess.run(["pdftotext", tmp, "-"],
+                                      capture_output=True, text=True).stdout
+                os.unlink(tmp)
+                check(f"published {med.group(2)}" in ctxt,
+                      "COMMITTED main.pdf carries the current-edition line "
+                      "(the PDF a visitor downloads is not stale)",
+                      med.group(2))
+            else:
+                ok("committed-PDF binding skipped (no git repo here)")
 
     # ── Phase 2: internal countable claims ─────────────────────────────────
     print("=== Phase 2: internal countable claims ===")
@@ -151,9 +190,10 @@ def main():
     # stale-total scan is scoped to the front matter, where whole-book totals
     # live; inside a chapter, "N chapters" is a positional count checked next
     for stale in ("twelve chapters", "thirteen chapters"):
-        hits = [f for f in ("main.tex", "README.md")
-                if stale in read(os.path.join(book, f))]
-        check(not hits, f"no stale '{stale}' in front matter", ",".join(hits) or "clean")
+        hits = [name for name, txt in (("main.tex", main_scan), ("README.md", readme))
+                if stale in txt]
+        check(not hits, f"no stale '{stale}' in front matter (history block exempt)",
+              ",".join(hits) or "clean")
     # any "spent N chapters" phrase inside chapter chNN counts its predecessors
     for cf in chapter_files:
         num = int(re.search(r"ch(\d\d)-", cf).group(1))
diff --git a/main.pdf b/main.pdf
index ffd93b0..498ca23 100644
Binary files a/main.pdf and b/main.pdf differ
diff --git a/main.tex b/main.tex
index 6d851b7..f927df2 100644
--- a/main.tex
+++ b/main.tex
@@ -37,6 +37,39 @@ claim it makes about a proof, a proof assistant has checked.\par}
 \restoregeometry
 \pagecolor{paper}\color{ink}
 
+% BEGIN PUBHIST ==================== publication history =====================
+% The current-edition line is machine-checked by check-book.sh: its chapter
+% count and page count must match the built book, and the committed PDF must
+% contain it. Historical lines are frozen and exempt from the claim checks.
+\thispagestyle{empty}
+\vspace*{2cm}
+{\small
+\noindent\textbf{Second edition} --- published August 8, 2026: fourteen
+chapters, 129 pages.
+
+\medskip
+\noindent\emph{Publication history}
+\begin{itemize}[leftmargin=1.4em]
+\item \textbf{First edition}, July 3, 2026 --- twelve chapters and the
+  Interlude; expanded the same day with the pen-and-paper program and
+  in-book solution pathways (53 to 106 pages).
+\item July 28, 2026 --- the Attestation Protocol added as a thirteenth
+  chapter.
+\item \textbf{Second edition}, August 8, 2026 --- full didactic overhaul
+  (seven moves, from a seven-reader audit); new Chapter~13, \emph{The
+  Second Summit} (SLH-DSA, post-quantum); the Attestation Protocol becomes
+  the fourteen-chapter book's single finale; \code{check-book.sh} added ---
+  the script that verifies every countable claim in this book, including
+  the line at the top of this page, against measured reality.
+\end{itemize}
+
+\medskip
+\noindent The complete revision record is the git history of
+\code{github.com/saymrwulf/verifying-crypto-with-lean}.
+}
+\clearpage
+% END PUBHIST ================================================================
+
 % ===================== HOW TO READ =====================
 \chapter*{How to read this book}
 \markboth{How to read this book}{}