diff --git a/payload_consumer/partition_writer.cc b/payload_consumer/partition_writer.cc
index b94f8c7..1fb929e 100644
--- a/payload_consumer/partition_writer.cc
+++ b/payload_consumer/partition_writer.cc
@@ -295,6 +295,16 @@
   return std::make_unique<DirectExtentWriter>(target_fd_);
 }
 
+bool PartitionWriter::ValidateSourceHash(const InstallOperation& operation,
+                                         const FileDescriptorPtr source_fd,
+                                         size_t block_size,
+                                         ErrorCode* error) {
+  brillo::Blob source_hash;
+  TEST_AND_RETURN_FALSE_ERRNO(fd_utils::ReadAndHashExtents(
+      source_fd, operation.src_extents(), block_size, &source_hash));
+  return ValidateSourceHash(source_hash, operation, source_fd, error);
+}
+
 bool PartitionWriter::ValidateSourceHash(const brillo::Blob& calculated_hash,
                                          const InstallOperation& operation,
                                          const FileDescriptorPtr source_fd,
diff --git a/payload_consumer/partition_writer.h b/payload_consumer/partition_writer.h
index 89e5884..e620c47 100644
--- a/payload_consumer/partition_writer.h
+++ b/payload_consumer/partition_writer.h
@@ -46,6 +46,10 @@
                                  const InstallOperation& operation,
                                  const FileDescriptorPtr source_fd,
                                  ErrorCode* error);
+  static bool ValidateSourceHash(const InstallOperation& operation,
+                                 const FileDescriptorPtr source_fd,
+                                 size_t block_size,
+                                 ErrorCode* error);
 
   // Perform necessary initialization work before InstallOperation can be
   // applied to this partition
diff --git a/payload_consumer/vabc_partition_writer.cc b/payload_consumer/vabc_partition_writer.cc
index 9db88a9..583ba4c 100644
--- a/payload_consumer/vabc_partition_writer.cc
+++ b/payload_consumer/vabc_partition_writer.cc
@@ -33,6 +33,7 @@
 #include "update_engine/payload_consumer/extent_map.h"
 #include "update_engine/payload_consumer/extent_reader.h"
 #include "update_engine/payload_consumer/file_descriptor.h"
+#include "update_engine/payload_consumer/file_descriptor_utils.h"
 #include "update_engine/payload_consumer/install_plan.h"
 #include "update_engine/payload_consumer/partition_writer.h"
 #include "update_engine/payload_consumer/snapshot_extent_writer.h"
@@ -267,9 +268,13 @@
 
 [[nodiscard]] bool VABCPartitionWriter::PerformSourceCopyOperation(
     const InstallOperation& operation, ErrorCode* error) {
-  // TODO(zhangkelvin) Probably just ignore SOURCE_COPY? They should be taken
-  // care of during Init();
-  return true;
+  // COPY ops are already handled during Init(), no need to do actual work, but
+  // we still want to verify that all blocks contain expected data.
+  auto source_fd = std::make_shared<EintrSafeFileDescriptor>();
+  TEST_AND_RETURN_FALSE_ERRNO(
+      source_fd->Open(install_part_.source_path.c_str(), O_RDONLY));
+  return PartitionWriter::ValidateSourceHash(
+      operation, source_fd, block_size_, error);
 }
 
 bool VABCPartitionWriter::PerformReplaceOperation(const InstallOperation& op,