s3Canonical User Id
The Amazon S3 canonical user ID for the origin access identity, used when giving the origin access identity read permission to an object in Amazon S3. For example: b970b42360b81c8ddbd79d2f5df0069ba9033c8a79655752abe380cd6d63ba8bcf23384d568fcf89fc49700b5e11a0fd
.