Script ToJSON instances serialises the full script

There used to be no orphan instance for ledger Script so we (Hydra)
provided our own. This newly introduced instance overlaps with our own
which would not be a problem, as we are fine using upstream instances,
but for the fact the serialisation is lossy as cardano-api only
serialised the hash of the script.

cardano-api/src/Cardano/Api/Orphans.hs

@@ -6,7 +6,6 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE StandaloneDeriving #-}
-{-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE UndecidableInstances #-}
 
 {-# OPTIONS_GHC -Wno-orphans #-}
@@ -40,6 +39,7 @@ import           Cardano.Ledger.UnifiedMap (UnifiedMap)
 import           Cardano.Slotting.Slot (SlotNo (..))
 import           Cardano.Slotting.Time (SystemStart (..))
 
+import qualified Cardano.Binary as CBOR
 import qualified Cardano.Crypto.Hash.Class as Crypto
 import qualified Cardano.Ledger.Alonzo.Data as Alonzo
 import qualified Cardano.Ledger.Alonzo.Scripts as Alonzo
@@ -61,7 +61,6 @@ import qualified Cardano.Ledger.Shelley.Rewards as Shelley
 import qualified Ouroboros.Consensus.Shelley.Eras as Consensus
 
 import           Cardano.Api.Script
-import           Cardano.Api.SerialiseRaw (serialiseToRawBytesHexText)
 
 -- Orphan instances involved in the JSON output of the API queries.
 -- We will remove/replace these as we provide more API wrapper types
@@ -241,11 +240,10 @@ instance ( Ledger.Era era
                SNothing -> Aeson.Null
                SJust dH -> toJSON $ ScriptDataHash dH
 
-instance ToJSON (Alonzo.Script (Babbage.BabbageEra Consensus.StandardCrypto)) where
-  toJSON s = Aeson.String . serialiseToRawBytesHexText
-               $ ScriptHash $ Ledger.hashScript @(Babbage.BabbageEra Consensus.StandardCrypto) s
 
 
+instance ToJSON (Alonzo.Script (Babbage.BabbageEra Consensus.StandardCrypto)) where
+  toJSON = Aeson.String . Text.decodeUtf8 . B16.encode . CBOR.serialize'
 
 instance Crypto.Crypto crypto => ToJSON (Shelley.DPState crypto) where
   toJSON dpState = object [ "dstate" .= Shelley.dpsDState dpState