diff --git a/.ots/c0685dabfb48360a3abc103b75357f94e9f054b2.ots b/.ots/c0685dabfb48360a3abc103b75357f94e9f054b2.ots
new file mode 100644
index 0000000..a12cdad
Binary files /dev/null and b/.ots/c0685dabfb48360a3abc103b75357f94e9f054b2.ots differ
diff --git a/.ots/commit-chain.txt b/.ots/commit-chain.txt
index 97112e9..d0f9c04 100644
--- a/.ots/commit-chain.txt
+++ b/.ots/commit-chain.txt
@@ -2,3 +2,8 @@
 4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963:db6f29e01a33d8ed8f127ff169d9f91d55e8a229
 db6f29e01a33d8ed8f127ff169d9f91d55e8a229:392ee723c3cf626d0e5281aa94771d7133bb345e
 392ee723c3cf626d0e5281aa94771d7133bb345e:392ee723c3cf626d0e5281aa94771d7133bb345e^1
+c0685dabfb48360a3abc103b75357f94e9f054b2:46aded7b9582bbed673843e2cf8a3f8fa742ad91
+46aded7b9582bbed673843e2cf8a3f8fa742ad91:4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963
+4a6f5ed0c12315b0bc8a0fa5815ada1bd20e5963:db6f29e01a33d8ed8f127ff169d9f91d55e8a229
+db6f29e01a33d8ed8f127ff169d9f91d55e8a229:392ee723c3cf626d0e5281aa94771d7133bb345e
+392ee723c3cf626d0e5281aa94771d7133bb345e:392ee723c3cf626d0e5281aa94771d7133bb345e^1
diff --git a/.ots/prev-commit.txt b/.ots/prev-commit.txt
index 9687ed2..79c74df 100644
--- a/.ots/prev-commit.txt
+++ b/.ots/prev-commit.txt
@@ -1 +1 @@
-46aded7b9582bbed673843e2cf8a3f8fa742ad91
+c0685dabfb48360a3abc103b75357f94e9f054b2
diff --git a/.ots/proof.ots b/.ots/proof.ots
index 14d73c1..407ebcf 100644
Binary files a/.ots/proof.ots and b/.ots/proof.ots differ
diff --git a/backfill-proofs.sh b/backfill-proofs.sh
index 6fbc16e..81ea0aa 100755
--- a/backfill-proofs.sh
+++ b/backfill-proofs.sh
@@ -55,13 +55,21 @@ for COMMIT in $COMMITS; do
     PROOF_FILE=".ots/${COMMIT}.ots"
     
     if [ -f "$PROOF_FILE" ]; then
-        # Try to upgrade existing proof
-        echo "  Upgrading existing proof..."
+        # Check if already fully attested
+        STATUS=$(ots info "$PROOF_FILE" 2>&1 | grep -c "PendingAttestation" || echo "0")
+        
+        if [ "$STATUS" -eq 0 ]; then
+            echo "  ✓ Already attested (skipping)"
+            continue
+        fi
+        
+        # Try to upgrade existing proof (only contacts calendars if pending)
+        echo "  Upgrading pending proof..."
         if ots upgrade "$PROOF_FILE" 2>/dev/null; then
             echo "  ✓ Upgraded to attested"
             UPDATED=$((UPDATED + 1))
         else
-            echo "  - Still pending (no upgrade available)"
+            echo "  - Still pending (no upgrade available yet)"
         fi
     else
         # Generate new proof for this commit
diff --git a/check-attestation.sh b/check-attestation.sh
new file mode 100755
index 0000000..5420dd3
--- /dev/null
+++ b/check-attestation.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# check-attestation.sh - Check if an OpenTimestamp proof is fully attested
+# Usage: check-attestation.sh <proof-file>
+# Returns: 0 if fully attested, 1 if pending
+
+PROOF_FILE="${1:-}"
+
+if [ -z "$PROOF_FILE" ] || [ ! -f "$PROOF_FILE" ]; then
+    echo "Error: proof file not found: $PROOF_FILE" >&2
+    exit 2
+fi
+
+# Check for PendingAttestation in ots info output
+if ots info "$PROOF_FILE" 2>&1 | grep -q "PendingAttestation"; then
+    echo "pending"
+    exit 1
+else
+    echo "attested"
+    exit 0
+fi
diff --git a/test5.txt b/test5.txt
new file mode 100644
index 0000000..ddc3ed7
--- /dev/null
+++ b/test5.txt
@@ -0,0 +1 @@
+# Test optimized backfill