diff --git a/chainweb-api.cabal b/chainweb-api.cabal
index 694f9eb..db5b6b6 100644
--- a/chainweb-api.cabal
+++ b/chainweb-api.cabal
@@ -69,9 +69,11 @@ library
     Chainweb.Api.Payload
     Chainweb.Api.RespItems
     Chainweb.Api.Sig
+    Chainweb.Api.SigCapability
     Chainweb.Api.Signer
     Chainweb.Api.StringEncoded
     Chainweb.Api.Transaction
+    Chainweb.Api.Verifier
     ChainwebData.Api
     ChainwebData.EventDetail
     ChainwebData.TransferDetail
diff --git a/lib/Chainweb/Api/SigCapability.hs b/lib/Chainweb/Api/SigCapability.hs
new file mode 100644
index 0000000..f2fa3dc
--- /dev/null
+++ b/lib/Chainweb/Api/SigCapability.hs
@@ -0,0 +1,28 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+module Chainweb.Api.SigCapability where
+
+------------------------------------------------------------------------------
+import Data.Aeson
+import Data.Ord (comparing)
+import Data.Text (Text)
+------------------------------------------------------------------------------
+
+data SigCapability = SigCapability
+  { _scName :: Text
+  , _scArgs :: [Value]
+  } deriving (Eq,Show)
+
+instance Ord SigCapability where
+  compare = comparing _scName
+
+instance ToJSON SigCapability where
+  toJSON SigCapability{..} = object
+    [ "name" .= _scName
+    , "args" .= _scArgs
+    ]
+
+instance FromJSON SigCapability where
+  parseJSON = withObject "SigCapability" $ \o -> SigCapability
+    <$> o .: "name"
+    <*> o .: "args"
diff --git a/lib/Chainweb/Api/Signer.hs b/lib/Chainweb/Api/Signer.hs
index 3636dad..9955745 100644
--- a/lib/Chainweb/Api/Signer.hs
+++ b/lib/Chainweb/Api/Signer.hs
@@ -1,34 +1,15 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
-
 module Chainweb.Api.Signer where
 
 ------------------------------------------------------------------------------
+import Chainweb.Api.SigCapability
 import Data.Aeson
 import Data.Maybe (fromMaybe, catMaybes)
 import Data.Ord
 import Data.Text (Text)
 ------------------------------------------------------------------------------
 
-data SigCapability = SigCapability
-  { _scName :: Text
-  , _scArgs :: [Value]
-  } deriving (Eq,Show)
-
-instance Ord SigCapability where
-  compare = comparing _scName
-
-instance ToJSON SigCapability where
-  toJSON SigCapability{..} = object
-    [ "name" .= _scName
-    , "args" .= _scArgs
-    ]
-
-instance FromJSON SigCapability where
-  parseJSON = withObject "SigCapability" $ \o -> SigCapability
-    <$> o .: "name"
-    <*> o .: "args"
-
 data Signer = Signer
   { _signer_addr :: Maybe Text
   , _signer_scheme :: Maybe Text
diff --git a/lib/Chainweb/Api/Verifier.hs b/lib/Chainweb/Api/Verifier.hs
new file mode 100644
index 0000000..405e79b
--- /dev/null
+++ b/lib/Chainweb/Api/Verifier.hs
@@ -0,0 +1,33 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+module Chainweb.Api.Verifier where
+
+------------------------------------------------------------------------------
+import Chainweb.Api.SigCapability
+import Data.Aeson
+import Data.Maybe (catMaybes)
+import Data.Ord
+import Data.Text (Text)
+------------------------------------------------------------------------------
+
+data Verifier = Verifier
+  { _verifier_name :: Maybe Text
+  , _verifier_proof :: Maybe Text
+  , _verifier_capList :: [SigCapability]
+  } deriving (Eq, Show)
+
+instance Ord Verifier where
+  compare = comparing _verifier_name
+
+instance ToJSON Verifier where
+  toJSON Verifier{..} = object $ catMaybes
+    [ fmap ("name" .=) _verifier_name
+    , fmap ("proof" .=) _verifier_proof
+    , Just $ "clist" .= _verifier_capList
+    ]
+
+instance FromJSON Verifier where
+  parseJSON = withObject "Verifier" $ \o -> Verifier
+    <$> o .:? "name"
+    <*> o .:? "proof"
+    <*> o .: "clist"