diff --git a/test/wcc/m4_combined_epoch.md5 b/test/wcc/m4_combined_epoch.md5
new file mode 100644
index 00000000..d27096ab
--- /dev/null
+++ b/test/wcc/m4_combined_epoch.md5
@@ -0,0 +1,14 @@
+# m4-combined-epoch — combined≡sep boundary, proven by the c6 gate (994 Tier-C)
+# emitter: out/bin/w6c_ww md5=840025113b9d72bee4402a011369336f (combined-built)
+# regen: git checkout m4-combined-epoch && make && for t in w6c wwdump w6a w6l ww; do out/bin/w6c_ww -o /tmp/e0_$t.s selfhost/cmd/$t/main.combined.ww; md5sum /tmp/e0_$t.s; done; diff vs below
+bf3c25ed79da65520e049c6d657fc482  w6c.s
+f8d37b1637fd03a93f1a4b2ea801037b  wwdump.s
+aa9a76494f8b0cef9565bba857c7ff76  w6a.s
+97b987dc914f93846ffbfe446cd47c92  w6l.s
+235ff74409ad1c2359135f455af507fe  ww.s
+# combined-epoch binary pins:
+840025113b9d72bee4402a011369336f  w6c_ww
+b8c8c57dd25dbb5d03dc424740f52c83  wwdump_ww
+2677b37ad0a0d47517e7efd5f1824aba  w6a_ww
+ec686a46a586931e3607617395116d27  w6l_ww
+8cb2aec5cf76fbc7d6c1e37808add6ec  ww_ww