checksumType

This header specifies the checksum type of the object, which determines how part-level checksums are combined to create an object-level checksum for multipart objects. You can use this header as a data integrity check to verify that the checksum type that is received is the same checksum that was specified. If the checksum type doesn’t match the checksum type that was specified for the object during the CreateMultipartUpload request, it’ll result in a BadDigest error. For more information, see Checking object integrity in the Amazon S3 User Guide.