diff --git a/pkgs/python-packages/default.nix b/pkgs/python-packages/default.nix
index 66e0961..bb5cfdd 100644
--- a/pkgs/python-packages/default.nix
+++ b/pkgs/python-packages/default.nix
@@ -17,6 +17,9 @@ in {
   cryptography = callPackage ./cryptography {};
   cryptography_vectors = callPackage ./cryptography/vectors.nix {};
 
+  # twisted 20.3.0, required by joinmarketbase
+  twisted = callPackage ./twisted {};
+
   joinmarketbase = joinmarketPkg ./jmbase;
   joinmarketclient = joinmarketPkg ./jmclient;
   joinmarketbitcoin = joinmarketPkg ./jmbitcoin;
diff --git a/pkgs/python-packages/twisted/default.nix b/pkgs/python-packages/twisted/default.nix
new file mode 100644
index 0000000..4215657
--- /dev/null
+++ b/pkgs/python-packages/twisted/default.nix
@@ -0,0 +1,62 @@
+{ lib, stdenv
+, buildPythonPackage
+, fetchPypi
+, python
+, zope_interface
+, incremental
+, automat
+, constantly
+, hyperlink
+, pyhamcrest
+, attrs
+, pyopenssl
+, service-identity
+, setuptools
+, idna
+}:
+buildPythonPackage rec {
+  pname = "Twisted";
+  version = "20.3.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    extension = "tar.bz2";
+    sha256 = "040yzha6cyshnn6ljgk2birgh6mh2cnra48xp5ina5vfsnsmab6p";
+  };
+
+  propagatedBuildInputs = [ zope_interface incremental automat constantly hyperlink pyhamcrest attrs setuptools ];
+
+  passthru.extras.tls = [ pyopenssl service-identity idna ];
+
+  # Patch t.p._inotify to point to libc. Without this,
+  # twisted.python.runtime.platform.supportsINotify() == False
+  patchPhase = lib.optionalString stdenv.isLinux ''
+    substituteInPlace src/twisted/python/_inotify.py --replace \
+      "ctypes.util.find_library('c')" "'${stdenv.glibc.out}/lib/libc.so.6'"
+  '';
+
+  # Generate Twisted's plug-in cache.  Twisted users must do it as well.  See
+  # http://twistedmatrix.com/documents/current/core/howto/plugin.html#auto3
+  # and http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=477103 for
+  # details.
+  postFixup = ''
+    $out/bin/twistd --help > /dev/null
+  '';
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest discover -s twisted/test
+  '';
+  # Tests require network
+  doCheck = false;
+
+  meta = with lib; {
+    homepage = "https://twistedmatrix.com/";
+    description = "Twisted, an event-driven networking engine written in Python";
+    longDescription = ''
+      Twisted is an event-driven networking engine written in Python
+      and licensed under the MIT license.
+    '';
+    license = licenses.mit;
+    maintainers = [ ];
+  };
+}