WAAuthenticationCredential *cred = [WAAuthenticationCredential credentialWithAzureServiceAccount:account accessKey:accessKey];

WACloudStorageClient *storageClient = [WACloudStorageClient storageClientWithCredential:cred];
WABlobContainer *container = [[WABlobContainer alloc] initContainerWithName:@"pictures" URL:@"" metadata:@""];
WABlob *blob = [[WABlob alloc] initBlobWithName:@"Koala.jpg" URL:@"" container:container];

[storageClient fetchBlobData:blob withCompletionHandler:^(NSData *imgData, NSError *error) {
    UIImage *blobImage = [UIImage imageWithData:imgData];
}];