diff --git a/scripts/update-anti-slashing-db.sh b/scripts/update-anti-slashing-db.sh
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+++ b/scripts/update-anti-slashing-db.sh
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+#!/usr/bin/env bash
+
+# Script to update EIP-3076 anti-slashing DB by replacing pubkey values
+# based on lookup in source and target cluster-lock.json files.
+#
+# Usage: update-anti-slashing-db.sh <eip3076-file> <source-cluster-lock> <target-cluster-lock>
+#
+# Arguments:
+#   eip3076-file          - Path to EIP-3076 JSON file to update in place
+#   source-cluster-lock   - Path to source cluster-lock.json
+#   target-cluster-lock   - Path to target cluster-lock.json
+#
+# The script traverses the EIP-3076 JSON file and finds all "pubkey" values in the
+# data array. For each pubkey, it looks up the value in the source cluster-lock.json's
+# distributed_validators[].public_shares[] arrays, remembers the indices, and then
+# replaces the pubkey with the corresponding value from the target cluster-lock.json
+# at the same indices.
+
+set -euo pipefail
+
+# Check if jq is installed
+if ! command -v jq &> /dev/null; then
+    echo "Error: jq is required but not installed. Please install jq first." >&2
+    exit 1
+fi
+
+# Validate arguments
+if [ "$#" -ne 3 ]; then
+    echo "Usage: $0 <eip3076-file> <source-cluster-lock> <target-cluster-lock>" >&2
+    exit 1
+fi
+
+EIP3076_FILE="$1"
+SOURCE_LOCK="$2"
+TARGET_LOCK="$3"
+
+# Validate files exist
+if [ ! -f "$EIP3076_FILE" ]; then
+    echo "Error: EIP-3076 file not found: $EIP3076_FILE" >&2
+    exit 1
+fi
+
+if [ ! -f "$SOURCE_LOCK" ]; then
+    echo "Error: Source cluster-lock file not found: $SOURCE_LOCK" >&2
+    exit 1
+fi
+
+if [ ! -f "$TARGET_LOCK" ]; then
+    echo "Error: Target cluster-lock file not found: $TARGET_LOCK" >&2
+    exit 1
+fi
+
+# Validate all files contain valid JSON
+if ! jq empty "$EIP3076_FILE" 2>/dev/null; then
+    echo "Error: EIP-3076 file contains invalid JSON: $EIP3076_FILE" >&2
+    exit 1
+fi
+
+if ! jq empty "$SOURCE_LOCK" 2>/dev/null; then
+    echo "Error: Source cluster-lock file contains invalid JSON: $SOURCE_LOCK" >&2
+    exit 1
+fi
+
+if ! jq empty "$TARGET_LOCK" 2>/dev/null; then
+    echo "Error: Target cluster-lock file contains invalid JSON: $TARGET_LOCK" >&2
+    exit 1
+fi
+
+# Create temporary files for processing
+TEMP_FILE=$(mktemp)
+trap 'rm -f "$TEMP_FILE" "${TEMP_FILE}.tmp"' EXIT INT TERM
+
+# Function to find pubkey in cluster-lock and return validator_index,share_index
+# Returns empty string if not found
+find_pubkey_indices() {
+    local pubkey="$1"
+    local cluster_lock_file="$2"
+
+    # Search through distributed_validators and public_shares
+    jq -r --arg pubkey "$pubkey" '
+        .distributed_validators as $validators |
+        foreach range(0; $validators | length) as $v_idx (
+            null;
+            . ;
+            $validators[$v_idx].public_shares as $shares |
+            foreach range(0; $shares | length) as $s_idx (
+                null;
+                . ;
+                if $shares[$s_idx] == $pubkey then
+                    "\($v_idx),\($s_idx)"
+                else
+                    empty
+                end
+            )
+        ) | select(. != null)
+    ' "$cluster_lock_file" | head -n 1
+}
+
+# Function to get pubkey from cluster-lock at specific indices
+get_pubkey_at_indices() {
+    local validator_idx="$1"
+    local share_idx="$2"
+    local cluster_lock_file="$3"
+
+    jq -r --argjson v_idx "$validator_idx" --argjson s_idx "$share_idx" '
+        .distributed_validators[$v_idx].public_shares[$s_idx]
+    ' "$cluster_lock_file"
+}
+
+echo "Reading EIP-3076 file: $EIP3076_FILE"
+echo "Source cluster-lock: $SOURCE_LOCK"
+echo "Target cluster-lock: $TARGET_LOCK"
+echo ""
+
+# Validate cluster-lock structure
+source_validators=$(jq '.distributed_validators | length' "$SOURCE_LOCK")
+target_validators=$(jq '.distributed_validators | length' "$TARGET_LOCK")
+
+# Validate that we got valid numeric values
+if [ -z "$source_validators" ] || [ "$source_validators" = "null" ]; then
+    echo "Error: Source cluster-lock missing 'distributed_validators' field" >&2
+    exit 1
+fi
+
+if [ -z "$target_validators" ] || [ "$target_validators" = "null" ]; then
+    echo "Error: Target cluster-lock missing 'distributed_validators' field" >&2
+    exit 1
+fi
+
+echo "Source cluster-lock has $source_validators validators"
+echo "Target cluster-lock has $target_validators validators"
+
+if [ "$source_validators" -eq 0 ]; then
+    echo "Error: Source cluster-lock has no validators" >&2
+    exit 1
+fi
+
+if [ "$target_validators" -eq 0 ]; then
+    echo "Error: Target cluster-lock has no validators" >&2
+    exit 1
+fi
+
+# Verify that target has at least as many validators as source
+if [ "$target_validators" -lt "$source_validators" ]; then
+    echo "Error: Target cluster-lock has fewer validators ($target_validators) than source ($source_validators)" >&2
+    echo "       This may result in missing pubkey replacements" >&2
+    exit 1
+fi
+
+echo ""
+
+# Get all unique pubkeys from the data array
+# Note: The same pubkey may appear multiple times, so we deduplicate with sort -u
+pubkeys=$(jq -r '.data[].pubkey' "$EIP3076_FILE" | sort -u)
+
+if [ -z "$pubkeys" ]; then
+    echo "Warning: No pubkeys found in EIP-3076 file" >&2
+    exit 0
+fi
+
+pubkey_count=$(echo "$pubkeys" | wc -l | xargs)
+echo "Found $pubkey_count unique pubkey(s) to process"
+echo ""
+
+# Copy original file to temp file, we'll modify it in place
+cp "$EIP3076_FILE" "$TEMP_FILE"
+
+# Process each pubkey
+while IFS= read -r old_pubkey; do
+    echo "Processing pubkey: $old_pubkey"
+
+    # Find indices in source cluster-lock
+    indices=$(find_pubkey_indices "$old_pubkey" "$SOURCE_LOCK")
+
+    if [ -z "$indices" ]; then
+        echo "  Error: Pubkey not found in source cluster-lock.json" >&2
+        echo "         Cannot proceed without mapping for all pubkeys" >&2
+        exit 1
+    fi
+
+    # Split indices
+    validator_idx=$(echo "$indices" | cut -d',' -f1)
+    share_idx=$(echo "$indices" | cut -d',' -f2)
+
+    echo "  Found at distributed_validators[$validator_idx].public_shares[$share_idx]"
+
+    # Verify target has sufficient validators
+    if [ "$validator_idx" -ge "$target_validators" ]; then
+        echo "  Error: Target cluster-lock.json doesn't have validator at index $validator_idx" >&2
+        echo "         Target has only $target_validators validators" >&2
+        exit 1
+    fi
+
+    # Verify target validator has sufficient public_shares
+    target_share_count=$(jq --argjson v_idx "$validator_idx" '.distributed_validators[$v_idx].public_shares | length' "$TARGET_LOCK")
+    if [ "$share_idx" -ge "$target_share_count" ]; then
+        echo "  Error: Target cluster-lock.json validator[$validator_idx] doesn't have share at index $share_idx" >&2
+        echo "         Target validator has only $target_share_count shares" >&2
+        exit 1
+    fi
+
+    # Get corresponding pubkey from target cluster-lock
+    new_pubkey=$(get_pubkey_at_indices "$validator_idx" "$share_idx" "$TARGET_LOCK")
+
+    if [ -z "$new_pubkey" ] || [ "$new_pubkey" = "null" ]; then
+        echo "  Error: Could not find pubkey at same indices in target cluster-lock.json" >&2
+        exit 1
+    fi
+
+    echo "  Replacing with: $new_pubkey"
+
+    # Replace the pubkey in the JSON data
+    # Note: The same pubkey may appear multiple times in the data array (one per validator).
+    # This filter will update ALL occurrences of the old pubkey with the new one.
+    # We modify the temp file in place using jq's output redirection
+    jq --arg old "$old_pubkey" --arg new "$new_pubkey" '
+        (.data[] | select(.pubkey == $old) | .pubkey) |= $new
+    ' "$TEMP_FILE" > "${TEMP_FILE}.tmp" && mv "${TEMP_FILE}.tmp" "$TEMP_FILE"
+
+    echo "  Done"
+    echo ""
+done <<< "$pubkeys"
+
+# Validate the output is valid JSON
+if ! jq empty "$TEMP_FILE" 2>/dev/null; then
+    echo "Error: Generated invalid JSON" >&2
+    exit 1
+fi
+
+# Replace original file with updated version
+cp "$TEMP_FILE" "$EIP3076_FILE"
+
+echo "Successfully updated $EIP3076_FILE"