diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- /dev/null
+++ b/CHANGELOG.md
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright (c) 2018, Monadic GmbH
+
+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 Monadic GmbH 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
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+CBOR encoding of [multihashes](../multihash-cryptonite), via [serialise](https://hackage.haskell.org/package/serialise).
diff --git a/multihash-serialise.cabal b/multihash-serialise.cabal
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--- /dev/null
+++ b/multihash-serialise.cabal
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+cabal-version: 2.2
+build-type:    Simple
+
+name:          multihash-serialise
+version:       0.1.0.0
+synopsis:      CBOR encoding of multihashes
+homepage:      https://github.com/oscoin/ipfs
+bug-reports:   https://github.com/oscoin/ipfs/issues
+license:       BSD-3-Clause
+license-file:  LICENSE
+author:        Kim Altintop
+maintainer:    Kim Altintop <kim@monadic.xyz>, Monadic Team <team@monadic.xyz>
+copyright:     2018 Monadic GmbH
+
+category:      Codec
+
+extra-source-files:
+      CHANGELOG.md
+    , README.md
+
+source-repository head
+    type: git
+    location: https://github.com/oscoin/ipfs
+
+common common
+    default-language: Haskell2010
+    ghc-options:
+        -Wall
+        -Wcompat
+        -Wincomplete-uni-patterns
+        -Wincomplete-record-updates
+        -Wredundant-constraints
+        -fprint-expanded-synonyms
+        -funbox-small-strict-fields
+
+library
+    import: common
+    hs-source-dirs: src
+    exposed-modules:
+        Codec.Serialise.Multihash
+
+    build-depends:
+        base >= 4.9 && < 5
+      , bytestring
+      , cryptonite > 0.13
+      , memory >= 0.11
+      , multibase
+      , multihash-cryptonite
+      , serialise
+
+    ghc-options:
+        -Wall
+        -Wcompat
+        -Wincomplete-uni-patterns
+        -Wincomplete-record-updates
+        -Wredundant-constraints
+        -fprint-expanded-synonyms
+        -funbox-small-strict-fields
+
+test-suite properties
+    import: common
+    main-is: Main.hs
+    hs-source-dirs: test/properties
+    type: exitcode-stdio-1.0
+
+    build-depends:
+        base
+      , cryptonite
+      , hedgehog
+      , multihash-serialise
+      , serialise
+
+    ghc-options:
+        -threaded
+        -rtsopts
+        -with-rtsopts=-N
+
diff --git a/src/Codec/Serialise/Multihash.hs b/src/Codec/Serialise/Multihash.hs
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--- /dev/null
+++ b/src/Codec/Serialise/Multihash.hs
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+{-# LANGUAGE ExistentialQuantification #-}
+{-# LANGUAGE ScopedTypeVariables       #-}
+{-# LANGUAGE TypeApplications          #-}
+
+-- |
+-- Copyright   : 2018 Monadic GmbH
+-- License     : BSD3
+-- Maintainer  : kim@monadic.xyz, team@monadic.xyz
+-- Stability   : provisional
+-- Portability : non-portable (GHC extensions)
+--
+-- A mapping of <https://github.com/multiformats/multihash multihash> to CBOR.
+--
+-- Instead of an opaque, multihash-encoded blob, this provides a tagged CBOR
+-- encoding where the hash algorithm used is a 'Word16' field containing the
+-- multihash code for the algorithm, followed by the digest bytes.
+module Codec.Serialise.Multihash
+    ( encode
+    , decode
+
+    -- * Re-exports
+    , Multihashable
+    )
+where
+
+import qualified Codec.Serialise as CBOR
+import qualified Codec.Serialise.Decoding as CBOR
+import qualified Codec.Serialise.Encoding as CBOR
+import           Control.Applicative (liftA2)
+import qualified Crypto.Hash as C
+import           Data.ByteArray (convert)
+import           Data.Multihash (Multihashable)
+import qualified Data.Multihash as Multi
+import           Data.Proxy (Proxy(..))
+
+-- | Multihash-like CBOR 'CBOR.Encoding' of a 'C.Digest'.
+encode :: Multihashable a => C.Digest a -> CBOR.Encoding
+encode dig =
+       CBOR.encodeListLen 3
+    <> CBOR.encodeWord 0    -- constructor tag / version
+    <> CBOR.encode (Multi.toCode (Multi.fromCryptonite dig))
+    <> CBOR.encodeBytes (convert dig)
+
+-- | CBOR 'CBOR.Decoder' to decode a 'C.Digest' encoded via 'encodeCBOR'.
+decode :: forall s a. Multihashable a => CBOR.Decoder s (C.Digest a)
+decode = do
+    pre <- liftA2 (,) CBOR.decodeListLen CBOR.decodeWord
+    case pre of
+        (3, 0) -> do
+            rithm <- Multi.fromCode <$> CBOR.decode
+            case rithm of
+                Nothing -> fail "Unknown HashAlgorithm"
+                Just  a
+                    | Multi.fromCryptonite (Proxy @a) /= a ->
+                        fail "Algorithm Mismatch"
+                    | otherwise -> do
+                        bytes <- CBOR.decodeBytes
+                        maybe (fail "Invalid Digest") pure
+                            $ C.digestFromByteString bytes
+
+        _ -> fail "Multihash: Invalid Tag"
diff --git a/test/properties/Main.hs b/test/properties/Main.hs
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--- /dev/null
+++ b/test/properties/Main.hs
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+{-# LANGUAGE TemplateHaskell #-}
+
+module Main (main) where
+
+import           Control.Monad (unless)
+import qualified Crypto.Hash as C
+import           System.Exit (exitFailure)
+import           System.IO (BufferMode(..), hSetBuffering, stderr, stdout)
+
+import qualified Codec.Serialise as CBOR
+import           Codec.Serialise.Multihash (Multihashable)
+import qualified Codec.Serialise.Multihash as Multihash
+
+import           Hedgehog
+import qualified Hedgehog.Gen as Gen
+import qualified Hedgehog.Range as Range
+
+main :: IO ()
+main = do
+    hSetBuffering stdout LineBuffering
+    hSetBuffering stderr LineBuffering
+
+    ok <- props
+    unless ok exitFailure
+
+props :: IO Bool
+props = checkParallel $$(discover)
+
+newtype Digest' a = Digest' { unDigest' :: C.Digest a }
+    deriving (Eq, Show)
+
+instance Multihashable a => CBOR.Serialise (Digest' a) where
+    encode = Multihash.encode . unDigest'
+    decode = Digest' <$> Multihash.decode
+
+prop_roundtrip :: Property
+prop_roundtrip = property $ do
+    bs <- forAll $ Gen.bytes (Range.singleton 128)
+    let digest = Digest' $ C.hashWith C.Blake2b_256 bs
+    tripping digest CBOR.serialise CBOR.deserialiseOrFail