diff --git a/src/Data/Blob.hs b/src/Data/Blob.hs
index be7f21fc9..0c1312f5d 100644
--- a/src/Data/Blob.hs
+++ b/src/Data/Blob.hs
@@ -1,11 +1,8 @@
 module Data.Blob
 ( Blob(..)
-, BlobKind(..)
 , These(..)
-, modeToDigits
 , nullBlob
 , sourceBlob
-, nullOid
 , BlobPair
 , blobPairDiffing
 , blobPairInserting
@@ -15,13 +12,10 @@ module Data.Blob
 , pathForBlobPair
 ) where
 
-import Data.ByteString.Char8 (ByteString, pack)
 import Data.Bifunctor.Join
 import Data.Language
 import Data.These
 import Data.Source as Source
-import Data.Word
-import Numeric
 
 
 -- | Represents a blobs suitable for diffing which can be either a blob to
@@ -56,26 +50,13 @@ languageTagForBlobPair pair = maybe [] showLanguage (languageForBlobPair pair)
 -- | The source, oid, path, kind and language of a blob.
 data Blob = Blob
   { blobSource :: Source -- ^ The UTF-8 encoded source text of the blob.
-  , blobOid :: ByteString -- ^ The Git object ID (SHA-1) of the blob.
   , blobPath :: FilePath -- ^ The file path to the blob.
   , blobLanguage :: Maybe Language -- ^ The language of this blob. Nothing denotes a langauge we don't support yet.
   }
   deriving (Show, Eq)
 
--- | The kind and file mode of a 'Blob'.
-data BlobKind = PlainBlob Word32 | ExecutableBlob Word32 | SymlinkBlob Word32
-  deriving (Show, Eq)
-
-modeToDigits :: BlobKind -> ByteString
-modeToDigits (PlainBlob mode) = pack $ showOct mode ""
-modeToDigits (ExecutableBlob mode) = pack $ showOct mode ""
-modeToDigits (SymlinkBlob mode) = pack $ showOct mode ""
-
 nullBlob :: Blob -> Bool
-nullBlob Blob{..} = blobOid == nullOid || nullSource blobSource
+nullBlob Blob{..} = nullSource blobSource
 
 sourceBlob :: FilePath -> Maybe Language -> Source -> Blob
-sourceBlob filepath language source = Blob source nullOid filepath language
-
-nullOid :: ByteString
-nullOid = "0000000000000000000000000000000000000000"
+sourceBlob filepath language source = Blob source filepath language
diff --git a/src/Rendering/JSON.hs b/src/Rendering/JSON.hs
index f386dbbf4..41cd0cf5c 100644
--- a/src/Rendering/JSON.hs
+++ b/src/Rendering/JSON.hs
@@ -11,14 +11,12 @@ import Data.Bifunctor.Join
 import Data.Language
 import qualified Data.Map as Map
 import Data.Text (Text)
-import Data.Text.Encoding (decodeUtf8)
 import GHC.Generics
 
 -- | Render a diff to a string representing its JSON.
 renderJSONDiff :: ToJSON a => BlobPair -> a -> Map.Map Text Value
 renderJSONDiff blobs diff = Map.fromList
   [ ("diff", toJSON diff)
-  , ("oids", toJSON (decodeUtf8 . blobOid <$> (biList . runJoin) blobs))
   , ("paths", toJSON (blobPath <$> (biList . runJoin) blobs))
   ]
 
diff --git a/test/Rendering/TOC/Spec.hs b/test/Rendering/TOC/Spec.hs
index 0fcbef5d2..62a14f507 100644
--- a/test/Rendering/TOC/Spec.hs
+++ b/test/Rendering/TOC/Spec.hs
@@ -253,4 +253,4 @@ blankDiff = merge (arrayInfo, arrayInfo) (Indexed [ inserting (Term $ literalInf
     literalInfo = Nothing :. Range 1 2 :. StringLiteral :. sourceSpanBetween (1, 2) (1, 4) :. Nil
 
 blankDiffBlobs :: Both Blob
-blankDiffBlobs = both (Blob (fromText "[]") nullOid "a.js" (Just TypeScript)) (Blob (fromText "[a]") nullOid "b.js" (Just TypeScript))
+blankDiffBlobs = both (Blob (fromText "[]") "a.js" (Just TypeScript)) (Blob (fromText "[a]") "b.js" (Just TypeScript))
diff --git a/test/Semantic/CLI/Spec.hs b/test/Semantic/CLI/Spec.hs
index 1d60ab225..f38cbe124 100644
--- a/test/Semantic/CLI/Spec.hs
+++ b/test/Semantic/CLI/Spec.hs
@@ -58,6 +58,6 @@ diffFixtures =
   ]
   where pathMode = Right [both ("test/fixtures/ruby/method-declaration.A.rb", Just Ruby) ("test/fixtures/ruby/method-declaration.B.rb", Just Ruby)]
 
-        jsonOutput = "{\"diff\":{\"merge\":{\"after\":{\"sourceRange\":[0,21],\"sourceSpan\":{\"start\":[1,1],\"end\":[4,1]}},\"children\":[{\"merge\":{\"after\":{\"sourceRange\":[0,20],\"sourceSpan\":{\"start\":[1,1],\"end\":[3,4]}},\"children\":[{\"merge\":{\"after\":{\"sourceRange\":[0,0],\"sourceSpan\":{\"start\":[1,1],\"end\":[1,1]}},\"children\":[],\"before\":{\"sourceRange\":[0,0],\"sourceSpan\":{\"start\":[1,1],\"end\":[1,1]}}}},{\"patch\":{\"replace\":[{\"children\":[],\"sourceRange\":[4,7],\"sourceSpan\":{\"start\":[1,5],\"end\":[1,8]}},{\"children\":[],\"sourceRange\":[4,7],\"sourceSpan\":{\"start\":[1,5],\"end\":[1,8]}}]}},{\"patch\":{\"insert\":{\"children\":[],\"sourceRange\":[8,9],\"sourceSpan\":{\"start\":[1,9],\"end\":[1,10]}}}},{\"merge\":{\"after\":{\"sourceRange\":[13,16],\"sourceSpan\":{\"start\":[2,3],\"end\":[2,6]}},\"children\":[{\"patch\":{\"insert\":{\"children\":[],\"sourceRange\":[13,16],\"sourceSpan\":{\"start\":[2,3],\"end\":[2,6]}}}}],\"before\":{\"sourceRange\":[8,11],\"sourceSpan\":{\"start\":[2,1],\"end\":[2,4]}}}}],\"before\":{\"sourceRange\":[0,11],\"sourceSpan\":{\"start\":[1,1],\"end\":[2,4]}}}}],\"before\":{\"sourceRange\":[0,12],\"sourceSpan\":{\"start\":[1,1],\"end\":[3,1]}}}},\"oids\":[\"0000000000000000000000000000000000000000\",\"0000000000000000000000000000000000000000\"],\"paths\":[\"test/fixtures/ruby/method-declaration.A.rb\",\"test/fixtures/ruby/method-declaration.B.rb\"]}\n"
+        jsonOutput = "{\"diff\":{\"merge\":{\"after\":{\"sourceRange\":[0,21],\"sourceSpan\":{\"start\":[1,1],\"end\":[4,1]}},\"children\":[{\"merge\":{\"after\":{\"sourceRange\":[0,20],\"sourceSpan\":{\"start\":[1,1],\"end\":[3,4]}},\"children\":[{\"merge\":{\"after\":{\"sourceRange\":[0,0],\"sourceSpan\":{\"start\":[1,1],\"end\":[1,1]}},\"children\":[],\"before\":{\"sourceRange\":[0,0],\"sourceSpan\":{\"start\":[1,1],\"end\":[1,1]}}}},{\"patch\":{\"replace\":[{\"children\":[],\"sourceRange\":[4,7],\"sourceSpan\":{\"start\":[1,5],\"end\":[1,8]}},{\"children\":[],\"sourceRange\":[4,7],\"sourceSpan\":{\"start\":[1,5],\"end\":[1,8]}}]}},{\"patch\":{\"insert\":{\"children\":[],\"sourceRange\":[8,9],\"sourceSpan\":{\"start\":[1,9],\"end\":[1,10]}}}},{\"merge\":{\"after\":{\"sourceRange\":[13,16],\"sourceSpan\":{\"start\":[2,3],\"end\":[2,6]}},\"children\":[{\"patch\":{\"insert\":{\"children\":[],\"sourceRange\":[13,16],\"sourceSpan\":{\"start\":[2,3],\"end\":[2,6]}}}}],\"before\":{\"sourceRange\":[8,11],\"sourceSpan\":{\"start\":[2,1],\"end\":[2,4]}}}}],\"before\":{\"sourceRange\":[0,11],\"sourceSpan\":{\"start\":[1,1],\"end\":[2,4]}}}}],\"before\":{\"sourceRange\":[0,12],\"sourceSpan\":{\"start\":[1,1],\"end\":[3,1]}}}},\"paths\":[\"test/fixtures/ruby/method-declaration.A.rb\",\"test/fixtures/ruby/method-declaration.B.rb\"]}\n"
         sExpressionOutput = "(Program\n  (Method\n    (Empty)\n  { (Identifier)\n  ->(Identifier) }\n  {+(Identifier)+}\n    (\n    {+(Identifier)+})))\n"
         tocOutput = "{\"changes\":{\"test/fixtures/ruby/method-declaration.A.rb -> test/fixtures/ruby/method-declaration.B.rb\":[{\"span\":{\"start\":[1,1],\"end\":[3,4]},\"category\":\"Method\",\"term\":\"bar\",\"changeType\":\"modified\"}]},\"errors\":{}}\n"
diff --git a/test/Semantic/Spec.hs b/test/Semantic/Spec.hs
index 6e10ff6b8..56d327478 100644
--- a/test/Semantic/Spec.hs
+++ b/test/Semantic/Spec.hs
@@ -37,4 +37,4 @@ spec = parallel $ do
       result `shouldBe` (Diff (Patch (Delete (In () []))) :: Diff [] () ())
 
   where
-    methodsBlob = Blob "def foo\nend\n" "ff7bbbe9495f61d9e1e58c597502d152bab1761e" "methods.rb" (Just Ruby)
+    methodsBlob = Blob "def foo\nend\n" "methods.rb" (Just Ruby)