diff --git a/pkgs/tools/misc/opentimestamps-client/default.nix b/pkgs/tools/misc/opentimestamps-client/default.nix
new file mode 100644
index 000000000000..a062aa992be6
--- /dev/null
+++ b/pkgs/tools/misc/opentimestamps-client/default.nix
@@ -0,0 +1,23 @@
+{ lib, buildPythonApplication, fetchFromGitHub, isPy3k
+, opentimestamps, GitPython, pysocks }:
+
+buildPythonApplication rec {
+  name = "opentimestamps-client-${version}";
+  version = "0.5.1";
+  disabled = (!isPy3k);
+
+  src = fetchFromGitHub {
+    owner = "opentimestamps";
+    repo = "opentimestamps-client";
+    rev = "opentimestamps-client-v0.5.1";
+    sha256 = "0s549xkb75r5wyvjlfmac8a1df6w0y55l98f492zsihdns1d6rzq";
+  };
+
+  propagatedBuildInputs = [ opentimestamps GitPython pysocks ];
+
+  meta = {
+    description = "Command-line tool to create and verify OpenTimestamps proofs";
+    homepage = https://github.com/opentimestamps/opentimestamps-client;
+    license = lib.licenses.lgpl3;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d5c017f8d93a..04d38e9d8fff 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16860,6 +16860,8 @@ with pkgs;
 
   openscad = callPackage ../applications/graphics/openscad {};
 
+  opentimestamps-client = python3Packages.callPackage ../tools/misc/opentimestamps-client {};
+
   opentx = callPackage ../applications/misc/opentx { };
 
   opera = callPackage ../applications/networking/browsers/opera {};