diff --git a/src/ZcashHaskell/Types.hs b/src/ZcashHaskell/Types.hs
index f9fe6f2..38d190f 100644
--- a/src/ZcashHaskell/Types.hs
+++ b/src/ZcashHaskell/Types.hs
@@ -45,6 +45,18 @@ type Seed = C.ByteString
 -- | A mnemonic phrase used to derive seeds
 type Phrase = BS.ByteString
 
+-- | A spending key for Sapling
+type SaplingSpendingKey = BS.ByteString
+
+-- | A spending key for Orchard
+type OrchardSpendingKey = BS.ByteString
+
+-- | A Sapling receiver
+type SaplingReceiver = BS.ByteString
+
+-- | An Orchard receiver
+type OrchardReceiver = BS.ByteString
+
 -- | Type to represent data after Bech32 decoding
 data RawData = RawData
   { hrp :: !BS.ByteString -- ^ Human-readable part of the Bech32 encoding