diff --git a/Control/Monad/Trans/Key.hs b/Control/Monad/Trans/Key.hs
new file mode 100644
--- /dev/null
+++ b/Control/Monad/Trans/Key.hs
@@ -0,0 +1,24 @@
+{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+
+module Control.Monad.Trans.Key (Keyring, Key, newKey, unKeyring) where
+
+import Control.Applicative
+import Control.Monad (guard)
+import Data.IORef
+import Data.Type.Equality
+import Numeric.Natural
+import System.IO.Unsafe
+import Unsafe.Coerce
+
+newtype Keyring s a = Keyring (IORef Natural -> a) deriving (Functor, Applicative, Monad)
+newtype Key s a = Key Natural
+
+instance TestEquality (Key s) where
+    Key i `testEquality` Key j = unsafeCoerce Refl <$ guard (i == j)
+
+newKey :: Keyring s (Key s a)
+newKey = Keyring $ \ r -> unsafePerformIO . atomicModifyIORef' r $ liftA2 (,) (+1) Key
+
+unKeyring :: (∀ s . Keyring s a) -> a
+unKeyring (Keyring f) = f $ unsafePerformIO $ newIORef 0
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright M Farkas-Dyck © 2019
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of M Farkas-Dyck nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,1 @@
+# key
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/key.cabal b/key.cabal
new file mode 100644
--- /dev/null
+++ b/key.cabal
@@ -0,0 +1,43 @@
+name:                key
+version:             0.1.0.0
+synopsis:            Type-safe unconstrained dynamic typing
+description:         A library of monadic typed keys which can be compared for equality, returning an equality proof if equal.
+
+                     See http://dx.doi.org/10.1145/2976002.2976008
+
+                     The authors of the cited document and of this package are disjoint.
+license:             BSD3
+license-file:        LICENSE
+author:              M Farkas-Dyck
+maintainer:          strake888@gmail.com
+copyright:           2019 M Farkas-Dyck
+-- category:            
+build-type:          Simple
+extra-source-files:  README.md
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:      .
+  exposed-modules:     Control.Monad.Trans.Key
+  build-depends:       base >= 4.7 && < 5
+  default-language:    Haskell2010
+  default-extensions:  UnicodeSyntax
+                     , LambdaCase
+                     , EmptyCase
+                     , InstanceSigs
+                     , PartialTypeSignatures
+                     , PolyKinds
+                     , MonadComprehensions
+                     , StandaloneDeriving
+                     , DeriveFunctor, DeriveFoldable, DeriveTraversable
+  ghc-options:         -Wall -Wcompat -Wredundant-constraints -Wno-name-shadowing
+                       -Wincomplete-record-updates -Wincomplete-uni-patterns
+                       -Werror=incomplete-patterns
+                       -Werror=incomplete-uni-patterns
+                       -Werror=incomplete-record-updates
+                       -Werror=missing-fields
+                       -Werror=missing-methods
+
+source-repository head
+  type:     git
+  location: https://github.com/strake/key.hs