diff --git a/.ots/.attestation-cache b/.ots/.attestation-cache
index 36f6542..aa496dc 100644
--- a/.ots/.attestation-cache
+++ b/.ots/.attestation-cache
@@ -7,3 +7,11 @@ db6f29e01a33d8ed8f127ff169d9f91d55e8a229:pending:1772897641
 c0685dabfb48360a3abc103b75357f94e9f054b2:pending:1772897657
 810d26b7af9c5d306e77fec290d360c7ac876b2e:pending:1772897661
 3b54e0cb8c611d3f3525ad2386368f60200891f1:pending:1772897667
+392ee723c3cf626d0e5281aa94771d7133bb345e:pending:1772897676
+db6f29e01a33d8ed8f127ff169d9f91d55e8a229:pending:1772897680
+4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963:pending:1772897683
+46aded7b9582bbed673843e2cf8a3f8fa742ad91:pending:1772897687
+c0685dabfb48360a3abc103b75357f94e9f054b2:pending:1772897691
+810d26b7af9c5d306e77fec290d360c7ac876b2e:pending:1772897694
+3b54e0cb8c611d3f3525ad2386368f60200891f1:pending:1772897698
+ed2cd259e918344c5a21ecf884b3178b4256ea74:pending:1772897704
diff --git a/.ots/commit-chain.txt b/.ots/commit-chain.txt
index 4e07156..5c48dc5 100644
--- a/.ots/commit-chain.txt
+++ b/.ots/commit-chain.txt
@@ -20,3 +20,11 @@ c0685dabfb48360a3abc103b75357f94e9f054b2:46aded7b9582bbed673843e2cf8a3f8fa742ad9
 4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963:db6f29e01a33d8ed8f127ff169d9f91d55e8a229
 db6f29e01a33d8ed8f127ff169d9f91d55e8a229:392ee723c3cf626d0e5281aa94771d7133bb345e
 392ee723c3cf626d0e5281aa94771d7133bb345e:392ee723c3cf626d0e5281aa94771d7133bb345e^1
+ed2cd259e918344c5a21ecf884b3178b4256ea74:3b54e0cb8c611d3f3525ad2386368f60200891f1
+3b54e0cb8c611d3f3525ad2386368f60200891f1:810d26b7af9c5d306e77fec290d360c7ac876b2e
+810d26b7af9c5d306e77fec290d360c7ac876b2e:c0685dabfb48360a3abc103b75357f94e9f054b2
+c0685dabfb48360a3abc103b75357f94e9f054b2:46aded7b9582bbed673843e2cf8a3f8fa742ad91
+46aded7b9582bbed673843e2cf8a3f8fa742ad91:4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963
+4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963:db6f29e01a33d8ed8f127ff169d9f91d55e8a229
+db6f29e01a33d8ed8f127ff169d9f91d55e8a229:392ee723c3cf626d0e5281aa94771d7133bb345e
+392ee723c3cf626d0e5281aa94771d7133bb345e:392ee723c3cf626d0e5281aa94771d7133bb345e^1
diff --git a/.ots/ed2cd259e918344c5a21ecf884b3178b4256ea74.ots b/.ots/ed2cd259e918344c5a21ecf884b3178b4256ea74.ots
new file mode 100644
index 0000000..ac3398e
Binary files /dev/null and b/.ots/ed2cd259e918344c5a21ecf884b3178b4256ea74.ots differ
diff --git a/.ots/prev-commit.txt b/.ots/prev-commit.txt
index 5d50931..abca7dd 100644
--- a/.ots/prev-commit.txt
+++ b/.ots/prev-commit.txt
@@ -1 +1 @@
-3b54e0cb8c611d3f3525ad2386368f60200891f1
+ed2cd259e918344c5a21ecf884b3178b4256ea74
diff --git a/.ots/proof.ots b/.ots/proof.ots
index ab33f8e..4da399d 100644
Binary files a/.ots/proof.ots and b/.ots/proof.ots differ
diff --git a/backfill-proofs.sh b/backfill-proofs.sh
index a859ec4..38fc3c0 100755
--- a/backfill-proofs.sh
+++ b/backfill-proofs.sh
@@ -108,7 +108,18 @@ for COMMIT in $COMMITS; do
         # Cache as pending
         cache_status "$COMMIT" "pending"
         
-        # Try to upgrade existing proof (only contacts calendars if pending)
+        # Skip upgrade if cache is fresh (< 10 min old)
+        CACHE_LINE=$(grep "^$COMMIT:" "$STATUS_CACHE" | tail -1)
+        CACHE_TIME=$(echo "$CACHE_LINE" | cut -d: -f3)
+        NOW=$(date +%s)
+        CACHE_AGE=$((NOW - CACHE_TIME))
+        
+        if [ "$CACHE_AGE" -lt 600 ]; then
+            echo "  - Pending (cached <10min, skipping calendar call)"
+            continue
+        fi
+        
+        # Try to upgrade existing proof (contacts calendars)
         echo "  Upgrading pending proof..."
         if ots upgrade "$PROOF_FILE" 2>/dev/null; then
             echo "  ✓ Upgraded to attested"
@@ -116,6 +127,8 @@ for COMMIT in $COMMITS; do
             UPDATED=$((UPDATED + 1))
         else
             echo "  - Still pending (no upgrade available yet)"
+            # Update cache timestamp
+            cache_status "$COMMIT" "pending"
         fi
     else
         # Generate new proof for this commit
diff --git a/test8.txt b/test8.txt
new file mode 100644
index 0000000..c251836
--- /dev/null
+++ b/test8.txt
@@ -0,0 +1 @@
+# Fourth commit