diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..d4ee656
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,18 @@
+# shell.nix
+let
+  # We pin to a specific nixpkgs commit for reproducibility.
+  # Last updated: 2024-04-29. Check for new commits at https://status.nixos.org.
+  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/cf8cc1201be8bc71b7cbbbdaf349b22f4f99c7ae.tar.gz") {};
+in pkgs.mkShell {
+  packages = [
+    (pkgs.python3.withPackages (python-pkgs: [
+      python-pkgs.opentimestamps
+      python-pkgs.leveldb
+      python-pkgs.pystache
+      python-pkgs.requests
+      python-pkgs.qrcode
+      python-pkgs.simplejson
+      python-pkgs.bitcoinlib
+    ]))
+  ];
+}