diff --git a/backend/services/docker-compose.yml b/backend/services/docker-compose.yml
index db0abdf2..9dd2b8cb 100644
--- a/backend/services/docker-compose.yml
+++ b/backend/services/docker-compose.yml
@@ -124,6 +124,8 @@ services:
       - BACKUP_SERVICE_URL=http://backup-service:3002
       - BACKUP_SERVICE_ENABLED=true
       - SERVICE_JWT_SECRET=${SERVICE_JWT_SECRET}
+      # Blockchain Service (port 3012, not default 3000)
+      - BLOCKCHAIN_SERVICE_URL=http://blockchain-service:3012
       # MinIO Object Storage (Server A: 192.168.1.100)
       - MINIO_ENDPOINT=${MINIO_ENDPOINT:-192.168.1.100}
       - MINIO_PORT=${MINIO_PORT:-9000}