diff --git a/Cargo.lock b/Cargo.lock
index 4466889..c427035 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1351,6 +1351,7 @@ name = "quic_demo"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "base64",
  "futures-util",
  "quinn",
  "rcgen",
diff --git a/prototypes/quic_demo/Cargo.toml b/prototypes/quic_demo/Cargo.toml
index 6a47464..87a9e0b 100644
--- a/prototypes/quic_demo/Cargo.toml
+++ b/prototypes/quic_demo/Cargo.toml
@@ -8,6 +8,7 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1.0.38"
+base64 = "0.13.0"
 futures-util = "0.3.9"
 quinn = "0.7.2"
 rcgen = "0.8.11"
diff --git a/prototypes/quic_demo/build_app_package.bash b/prototypes/quic_demo/build_app_package.bash
index 9322ba2..6260846 100755
--- a/prototypes/quic_demo/build_app_package.bash
+++ b/prototypes/quic_demo/build_app_package.bash
@@ -12,7 +12,9 @@ pushd ../../
 git archive --format=tar "$GIT_COMMIT" | sudo docker build -f prototypes/quic_demo/Dockerfile -t "$DOCKER_TAG" --build-arg "git_version=$GIT_COMMIT" -
 popd
 
-sudo docker run --rm "$DOCKER_TAG" tar -c \
+sudo docker run --rm "$DOCKER_TAG" \
+tar -c \
+app \
 quic_demo_relay_server \
 | gzip > "app_packages/ptth_quic_relay_$GIT_COMMIT_SHORT.tar.gz"
 
diff --git a/prototypes/quic_demo/src/bin/quic_demo_relay_server.rs b/prototypes/quic_demo/src/bin/quic_demo_relay_server.rs
index 8230553..6ab9876 100644
--- a/prototypes/quic_demo/src/bin/quic_demo_relay_server.rs
+++ b/prototypes/quic_demo/src/bin/quic_demo_relay_server.rs
@@ -16,6 +16,7 @@ async fn main () -> anyhow::Result <()> {
 	
 	let listen_addr = opt.listen_addr.unwrap_or_else (|| String::from ("0.0.0.0:30380")).parse ()?;
 	let (mut incoming, server_cert) = make_server_endpoint (listen_addr)?;
+	println! ("Base64 cert: {}", base64::encode (&server_cert));
 	tokio::fs::write ("quic_server.crt", &server_cert).await?;
 	
 	let relay_state = RelayState::default ();