checksumCrc64Nvme

The Base64 encoded, 64-bit CRC64NVME checksum of the object. This checksum is present if the object being copied was uploaded with the CRC64NVME checksum algorithm, or if the object was uploaded without a checksum (and Amazon S3 added the default checksum, CRC64NVME, to the uploaded object). For more information, see Checking object integrity in the Amazon S3 User Guide.