-func setupKeepClient(config apiConfig, keepServicesJSON string, isDst bool, replications int, srcBlobSignatureTTL time.Duration) (kc *keepclient.KeepClient, err error) {
+func setupKeepClient(config apiConfig, keepServicesJSON string, isDst bool, replications int, srcBlobSignatureTTL time.Duration) (kc *keepclient.KeepClient, blobSignatureTTL time.Duration, err error) {