How can I check the integrity of copied files using S3DistCp?

To explicitly check the integrity of files, you can employ Amazon S3's integrity checking features. Amazon S3 performs integrity checks on each file during uploads and downloads. For instance, when you upload a file, you can specify a checksum algorithm in S3, and S3 will calculate and store the checksum. Post-transfer, you can manually verify this checksum against your local file's checksum to ensure integrity

https://aws.amazon.com/getting-started/hands-on/amazon-s3-with-additional-checksums/