diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..81a7120
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,35 @@
+language: minimal
+
+# broken:
+#   - PKG=electrs STABLE=0
+
+# Retry installing nix due to nondeterministic error
+#   Fatal error: glibc detected an invalid stdio handle
+# see:
+#   https://github.com/nh2/static-haskell-nix/pull/27#issuecomment-502652181
+#   https://github.com/nixos/nix/issues/2733
+install: |
+  (for i in {1..5}; do bash <(curl https://nixos.org/nix/install) && exit 0; done; exit 1)
+  . /home/travis/.nix-profile/etc/profile.d/nix.sh
+  nix-env -iA cachix -f https://cachix.org/api/v1/install
+  cachix use nix-bitcoin
+  [ $STABLE -eq 1 ] && export NIX_PATH="nixpkgs=$(nix eval --raw -f pkgs/nixpkgs-pinned.nix nixpkgs)"
+  [ $STABLE -eq 0 ] && export NIX_PATH="nixpkgs=$(nix eval --raw -f pkgs/nixpkgs-pinned.nix nixpkgs-unstable)"
+  VER="$(nix eval nixpkgs.lib.version)"
+env:
+  matrix:
+  - PKG=nodeinfo STABLE=1
+  - PKG=hwi STABLE=1
+  - PKG=hwi STABLE=0
+  - PKG=lightning-charge STABLE=1
+  - PKG=lightning-charge STABLE=0
+  - PKG=nanopos STABLE=1
+  - PKG=nanopos STABLE=0
+  - PKG=spark-wallet STABLE=1
+  - PKG=spark-wallet STABLE=0
+  - PKG=elementsd STABLE=1
+  - PKG=elementsd STABLE=0
+  - PKG=electrs STABLE=1
+script: |
+  printf '%s (%s)\n' "$NIX_PATH" "$VER"
+  nix-build -A $PKG
diff --git a/pkgs/nixpkgs-pinned.nix b/pkgs/nixpkgs-pinned.nix
index 1ee64cd..bc10fd7 100644
--- a/pkgs/nixpkgs-pinned.nix
+++ b/pkgs/nixpkgs-pinned.nix
@@ -1,12 +1,7 @@
+let
+  fetch = rev: builtins.fetchTarball "https://github.com/nixos/nixpkgs-channels/archive/${rev}.tar.gz";
+in
 {
-  nixpkgs = builtins.fetchGit {
-    url = "https://github.com/nixos/nixpkgs-channels";
-    ref = "nixos-19.03";
-    rev = "e6ad5e75f3bfaab5e7b7f0f128bf13d534879e65";
-  };
-  nixpkgs-unstable = builtins.fetchGit {
-    url = "https://github.com/nixos/nixpkgs-channels";
-    ref = "nixos-unstable";
-    rev = "765a71f15025ce78024bae3dc4a92bd2be3a8fbf";
-  };
+  nixpkgs = fetch "e6ad5e75f3bfaab5e7b7f0f128bf13d534879e65";
+  nixpkgs-unstable = fetch "765a71f15025ce78024bae3dc4a92bd2be3a8fbf";
 }