checksumCrc64Nvme

The Base64 encoded, 64-bit CRC64NVME checksum of the object. This header is present if the object was uploaded with the CRC64NVME checksum algorithm, or if it was uploaded without a checksum (and Amazon S3 added the default checksum, CRC64NVME, to the uploaded object). For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.