Account for missing response fields in Zebra response (#43)

This PR adds code to account for the missing `time` field in the Zebra response for blocks and raw transactions.

Reviewed-on: #43
Co-authored-by: pitmutt <rene@vergara.network>
Co-committed-by: pitmutt <rene@vergara.network>

CHANGELOG.md

@@ -5,8 +5,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.1.0]
 
-## [Unreleased]
+### Added
+
+- Functionality to capture Sapling Spends
+
+### Changed
+
+- Modified the `makeZebraCall` function to handle errors explicitly
+- Modified the RPC response to handle missing `result` field
+
+## [0.5.0.1]
 
 ### Added
 
@@ -20,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Types for Spending Keys and Receivers for Sapling and Orchard
 - Function to generate an Orchard receiver
 - Function to generate a Sapling receiver
+- Function to generate a Transparent receiver
 
 ### Changed
 

librustzcash-wrapper/src/lib.rs

@@ -684,26 +684,19 @@ pub extern "C" fn rust_wrapper_sapling_chgpaymentaddress(
     out: *mut u8,
     out_len: &mut usize
     ){
-    println!("Entering ChangeAddress generation....");
     let vexspk: Vec<u8> = marshall_from_haskell_var(extspk, extspk_len, RW);
     let vexspkp = &vexspk;
     let extspku8 : &[u8] = &vexspkp;
-    println!("Received ExtendedSpendingKey in Bytes...\n{:?}\n",extspku8);
     let extspk =  match ExtendedSpendingKey::from_bytes(&extspku8) {
         Ok( k ) => k,
         Err( e ) => {
             // error recovering ExtendedSpendingKey
-            println!("\n>>>> Error generating ExtendedSpendingKey");
             marshall_to_haskell_var(&vec![0], out, out_len, RW);
             return
         }
     };
-    println!("ExtendedSpendingKey -> {:?}",extspk);
     let dfvk = extspk.to_diversifiable_full_viewing_key();
     let ( divIx, cPmtAddress ) = dfvk.change_address();
-    println!("\nDiversifierIndex > {:?}\n\nChange Payment Address -> {:?}\n ", 
-             divIx, cPmtAddress);
-    println!("Change Payment Address in bytes : \n{:?}",cPmtAddress.to_bytes());
     marshall_to_haskell_var(&cPmtAddress.to_bytes().to_vec(), out, out_len, RW);
 }
 
@@ -733,13 +726,17 @@ pub extern "C" fn rust_wrapper_derive_orchard_receiver(
     spend_key: *const u8,
     spend_key_len: usize,
     add_id: u32,
+    scope: bool,
     out: *mut u8,
     out_len: &mut usize
     ){
     let sk_in: Vec<u8> = marshall_from_haskell_var(spend_key, spend_key_len, RW);
     let sk = SpendingKey::from_bytes(sk_in[0..32].try_into().unwrap()).unwrap();
     let fvk = FullViewingKey::from(&sk);
-    let o_rec = fvk.address_at(add_id, Scope::External);
+    let sc = if scope {
+        Scope::External
+    } else {Scope::Internal};
+    let o_rec = fvk.address_at(add_id, sc);
     marshall_to_haskell_var(&o_rec.to_raw_address_bytes().to_vec(), out, out_len, RW);
 
 }

src/C/Zcash.chs

@@ -170,6 +170,7 @@ import ZcashHaskell.Types
 {# fun unsafe rust_wrapper_derive_orchard_receiver as rustWrapperGenOrchardReceiver
      { toBorshVar* `BS.ByteString'&
      , `Word32'
+     , `Bool'
      , getVarBuffer `Buffer (BS.ByteString)'&
      }
   -> `()'

src/ZcashHaskell/Keys.hs

@@ -21,7 +21,7 @@ import Foreign.Rust.Marshall.Variable
   ( withBorshVarBuffer
   , withPureBorshVarBuffer
   )
-import ZcashHaskell.Types (Phrase, Seed)
+import ZcashHaskell.Types (Phrase, Seed(..), ToBytes(..))
 
 -- | Generate a random seed that can be used to generate private keys for shielded addresses and transparent addresses.
 generateWalletSeedPhrase :: IO Phrase
@@ -30,7 +30,7 @@ generateWalletSeedPhrase = withBorshVarBuffer rustWrapperGenSeedPhrase
 -- | Derive a cryptographic seed from the given seed phrase.
 getWalletSeed :: Phrase -> Maybe Seed
 getWalletSeed p =
-  if BS.length result > 0
+  if BS.length (getBytes result) > 0
     then Just result
     else Nothing
   where

src/ZcashHaskell/Orchard.hs

@@ -37,29 +37,39 @@ import ZcashHaskell.Utils (encodeBech32m, f4Jumble)
 
 -- | Derives an Orchard spending key for the given seed and account ID
 genOrchardSpendingKey ::
-     Seed -> CoinType -> AccountId -> Maybe OrchardSpendingKey
+     Seed -- ^ The cryptographic seed for the wallet
+  -> CoinType -- ^ The coin type constant
+  -> AccountId -- ^ The index of the account to be used
+  -> Maybe OrchardSpendingKey
 genOrchardSpendingKey s coinType accountId =
   if BS.length k /= 32
     then Nothing
-    else Just k
+    else Just $ OrchardSpendingKey k
   where
     k =
       withPureBorshVarBuffer $
       rustWrapperGenOrchardSpendKey
-        s
+        (getBytes s)
         (getValue coinType)
         (fromIntegral accountId)
 
 -- | Derives an Orchard receiver for the given spending key and index
-genOrchardReceiver :: Int -> OrchardSpendingKey -> Maybe OrchardReceiver
-genOrchardReceiver i osk =
+genOrchardReceiver ::
+     Int -- ^ The index of the address to be created
+  -> Scope -- ^ `External` for wallet addresses, `Internal` for change addresses
+  -> OrchardSpendingKey -- ^ The spending key
+  -> Maybe OrchardReceiver
+genOrchardReceiver i scope osk =
   if BS.length k /= 43
     then Nothing
-    else Just k
+    else Just $ OrchardReceiver k
   where
     k =
       withPureBorshVarBuffer $
-      rustWrapperGenOrchardReceiver osk (fromIntegral i)
+      rustWrapperGenOrchardReceiver
+        (getBytes osk)
+        (fromIntegral i)
+        (scope == External)
 
 -- | Checks if given bytestring is a valid encoded unified address
 isValidUnifiedAddress :: BS.ByteString -> Maybe UnifiedAddress
@@ -78,10 +88,10 @@ isValidUnifiedAddress str =
       UnifiedAddress
         whichNet
         (if BS.length (raw_o x) == 43
-           then Just (raw_o x)
+           then Just $ OrchardReceiver (raw_o x)
            else Nothing)
         (if BS.length (raw_s x) == 43
-           then Just (raw_s x)
+           then Just $ SaplingReceiver (raw_s x)
            else Nothing)
         (if not (BS.null (raw_t x))
            then Just $ TransparentAddress P2PKH (fromRawBytes $ raw_t x)
@@ -105,8 +115,8 @@ encodeUnifiedAddress ua = encodeBech32m (E.encodeUtf8 hr) b
           case ta_type t of
             P2SH -> packReceiver 0x01 $ Just $ toBytes $ ta_bytes t
             P2PKH -> packReceiver 0x00 $ Just $ toBytes $ ta_bytes t
-    sReceiver = packReceiver 0x02 $ s_rec ua
-    oReceiver = packReceiver 0x03 $ o_rec ua
+    sReceiver = packReceiver 0x02 $ getBytes <$> s_rec ua
+    oReceiver = packReceiver 0x03 $ getBytes <$> o_rec ua
     padding = E.encodeUtf8 $ T.justifyLeft 16 '\NUL' hr
     packReceiver :: Word8 -> Maybe BS.ByteString -> BS.ByteString
     packReceiver typeCode receiver' =

src/ZcashHaskell/Sapling.hs

@@ -20,9 +20,9 @@ module ZcashHaskell.Sapling where
 import C.Zcash
   ( rustWrapperIsShielded
   , rustWrapperSaplingCheck
+  , rustWrapperSaplingChgPaymentAddress
   , rustWrapperSaplingNoteDecode
   , rustWrapperSaplingPaymentAddress
-  , rustWrapperSaplingChgPaymentAddress
   , rustWrapperSaplingSpendingkey
   , rustWrapperSaplingVkDecode
   , rustWrapperTxParse
@@ -41,11 +41,11 @@ import ZcashHaskell.Types
   , DecodedNote(..)
   , RawData(..)
   , RawTxResponse(..)
-  , SaplingInternalReceiver
-  , SaplingReceiver
+  , SaplingReceiver(..)
   , SaplingSpendingKey(..)
   , Seed(..)
   , ShieldedOutput(..)
+  , ToBytes(..)
   , decodeHexText
   , getValue
   )
@@ -90,23 +90,25 @@ instance FromJSON RawTxResponse where
       ht <- obj .: "height"
       c <- obj .: "confirmations"
       b <- obj .: "blocktime"
+      sSpend <- obj .: "vShieldedSpend"
       case o of
-        Nothing -> pure $ RawTxResponse i h (getShieldedOutputs h) [] ht c b
+        Nothing ->
+          pure $ RawTxResponse i h sSpend (getShieldedOutputs h) [] ht c b
         Just o' -> do
           a <- o' .: "actions"
-          pure $ RawTxResponse i h (getShieldedOutputs h) a ht c b
+          pure $ RawTxResponse i h sSpend (getShieldedOutputs h) a ht c b
 
 -- | Attempts to obtain a sapling SpendingKey using a HDSeed
 genSaplingSpendingKey :: Seed -> CoinType -> Int -> Maybe SaplingSpendingKey
 genSaplingSpendingKey seed c i = do
   if BS.length res == 169
-    then Just res
+    then Just $ SaplingSpendingKey res
     else Nothing
   where
     res =
       withPureBorshVarBuffer
         (rustWrapperSaplingSpendingkey
-           seed
+           (getBytes seed)
            (fromIntegral $ getValue c)
            (fromIntegral i))
 
@@ -114,20 +116,21 @@ genSaplingSpendingKey seed c i = do
 genSaplingPaymentAddress :: Int -> SaplingSpendingKey -> Maybe SaplingReceiver
 genSaplingPaymentAddress i extspk =
   if BS.length res == 43
-    then Just res
+    then Just $ SaplingReceiver res
     else Nothing
   where
     res =
       withPureBorshVarBuffer
-        (rustWrapperSaplingPaymentAddress extspk (fromIntegral (i * 111)))
+        (rustWrapperSaplingPaymentAddress
+           (getBytes extspk)
+           (fromIntegral (i * 111)))
 
 -- | Generate an internal Sapling address
-genSaplingInternalAddress :: SaplingSpendingKey -> Maybe SaplingInternalReceiver
+genSaplingInternalAddress :: SaplingSpendingKey -> Maybe SaplingReceiver
 genSaplingInternalAddress sk =
-  if (BS.length res) > 0
-    then Just res
+  if BS.length res == 43
+    then Just $ SaplingReceiver res
     else Nothing
   where
     res =
-      withPureBorshVarBuffer (rustWrapperSaplingChgPaymentAddress sk)
-  
+      withPureBorshVarBuffer (rustWrapperSaplingChgPaymentAddress $ getBytes sk)

src/ZcashHaskell/Transparent.hs

@@ -17,30 +17,36 @@ module ZcashHaskell.Transparent where
 
 import Control.Exception (throwIO)
 import Crypto.Hash
+import Crypto.Secp256k1
 import qualified Data.ByteArray as BA
 import qualified Data.ByteString as BS
 import Data.ByteString.Base58 (bitcoinAlphabet, encodeBase58)
+import Data.HexString
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as E
+import Data.Word
+import Haskoin.Address (Address(..))
+import qualified Haskoin.Crypto.Hash as H
+import Haskoin.Crypto.Keys.Extended
 import ZcashHaskell.Types
   ( AccountId
-  , Seed
+  , CoinType(..)
+  , Scope(..)
+  , Seed(..)
+  , ToBytes(..)
   , TransparentAddress(..)
+  , TransparentSpendingKey(..)
   , TransparentType(..)
   , ZcashNet(..)
-  , CoinType(..)
   , getTransparentPrefix
   , getValue
   )
 
-import Crypto.Secp256k1
-import Haskoin.Crypto.Keys.Extended
-import Data.HexString
-import Data.Word
-import Haskoin.Address (Address(..))
-import qualified Haskoin.Crypto.Hash as H
-
-encodeTransparent :: ZcashNet -> TransparentAddress -> T.Text
+-- | Encodes a `TransparentAddress` into the human-readable format per the Zcash Protocol section 5.6.1.1
+encodeTransparent ::
+     ZcashNet -- ^ The network, `MainNet` or `TestNet`
+  -> TransparentAddress -- ^ The address to encode
+  -> T.Text
 encodeTransparent zNet t =
   encodeTransparent' (getTransparentPrefix zNet (ta_type t)) $
   toBytes $ ta_bytes t
@@ -54,31 +60,34 @@ encodeTransparent zNet t =
         digest = BS.pack [a, b] <> h
         checksum = sha256 $ sha256 digest
 
--- | Attempts to generate an Extended Private Key from a known HDSeed.
-genTransparentPrvKey :: Seed -> CoinType -> AccountId -> IO XPrvKey
+-- | Generate an Extended Private Key from a known HDSeed.
+genTransparentPrvKey ::
+     Seed -- ^ The cryptographic seed of the wallet
+  -> CoinType -- ^ The coin type constant to be used
+  -> AccountId -- ^ The index of the account to be used
+  -> IO TransparentSpendingKey
 genTransparentPrvKey hdseed ctype accid = do
   let coin = getValue ctype
   ioCtx <- createContext
-  let path = Deriv :| 44 :| coin :| AccounId :/ 0 :/ 0 :: DerivPath
-  let prvKey = makeXPrvKey hdseed
+  let path = Deriv :| 44 :| coin :| fromIntegral accid :: DerivPath
+  let prvKey = makeXPrvKey $ getBytes hdseed
   return $ derivePath ioCtx path prvKey
 
-genTransparentPubKey :: XPrvKey -> IO XPubKey
-genTransparentPubKey xPrvKey  = do
-  ioCtx <- createContext
-  return $ deriveXPubKey ioCtx xPrvKey
-
-genTransparentPubAddress :: XPubKey -> IO Address
-genTransparentPubAddress xPubKey  = do
-  ioCtx <- createContext
-  return $ xPubAddr ioCtx xPubKey
-
 -- | Generate a transparent receiver
-genTransparentReceiver :: Int -> XPrvKey -> IO TransparentAddress
-genTransparentReceiver i xprvk = do
+genTransparentReceiver ::
+     Int -- ^ The index of the address to be created
+  -> Scope -- ^ `External` for wallet addresses or `Internal` for change addresses
+  -> XPrvKey -- ^ The transparent private key
+  -> IO TransparentAddress
+genTransparentReceiver i scope xprvk = do
   ioCtx <- createContext
-  let rootPubKey = deriveXPubKey ioCtx xprvk
-  let childPubKey = pubSubKey ioCtx rootPubKey (fromIntegral i)
+  let s =
+        case scope of
+          External -> 0
+          Internal -> 1
+  let path = Deriv :/ s :/ fromIntegral i :: DerivPath
+  let childPrvKey = derivePath ioCtx path xprvk
+  let childPubKey = deriveXPubKey ioCtx childPrvKey
   let x = xPubAddr ioCtx childPubKey
   case x of
     PubKeyAddress k -> return $ TransparentAddress P2PKH $ fromBinary k

src/ZcashHaskell/Types.hs

@@ -7,7 +7,7 @@
 -- Copyright   :  2022-2024 Vergara Technologies
 -- License     :  MIT
 --
--- Maintainer  :  pitmut@vergara.tech
+-- Maintainer  :  pitmutt@vergara.tech
 -- Stability   :  experimental
 -- Portability :  unknown
 --
@@ -15,6 +15,7 @@
 --
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE GeneralisedNewtypeDeriving #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DerivingVia #-}
 {-# LANGUAGE UndecidableInstances #-}
@@ -30,6 +31,7 @@ import qualified Data.ByteString as BS
 import qualified Data.ByteString.Char8 as C
 import Data.HexString
 import Data.Int
+import Data.Maybe (fromMaybe)
 import Data.Structured
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as E
@@ -37,14 +39,37 @@ import Data.Word
 import qualified GHC.Generics as GHC
 import qualified Generics.SOP as SOP
 import Haskoin.Address (Address)
+import Haskoin.Crypto.Keys.Extended (XPrvKey)
 
 -- * General
 --
 -- | A seed for generating private keys
-type Seed = C.ByteString
+newtype Seed =
+  Seed BS.ByteString
+  deriving stock (Eq, Prelude.Show, GHC.Generic)
+  deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)
+  deriving anyclass (Data.Structured.Show)
+  deriving (BorshSize, ToBorsh, FromBorsh) via AsStruct Seed
+
+instance ToBytes Seed where
+  getBytes (Seed x) = x
 
 -- | A mnemonic phrase used to derive seeds
-type Phrase = BS.ByteString
+newtype Phrase =
+  Phrase C.ByteString
+  deriving stock (Eq, Prelude.Show, GHC.Generic, Read)
+  deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)
+  deriving anyclass (Data.Structured.Show)
+  deriving (BorshSize, ToBorsh, FromBorsh) via AsStruct Phrase
+
+instance ToBytes Phrase where
+  getBytes (Phrase x) = x
+
+-- | Scope for addresses/receivers
+data Scope
+  = External -- ^ Addresses used publically to receive payments
+  | Internal -- ^ Addresses used internally by wallets for change and shielding
+  deriving (Eq, Prelude.Show, Read)
 
 -- | Type to represent data after Bech32 decoding
 data RawData = RawData
@@ -144,7 +169,7 @@ instance (FromJSON r) => FromJSON (RpcResponse r) where
     withObject "RpcResponse" $ \obj -> do
       e <- obj .:? "error"
       i <- obj .: "id"
-      r <- obj .: "result"
+      r <- obj .:? "result"
       pure $ MakeRpcResponse e i r
 
 -- | A type to model the errors from the Zcash RPC
@@ -167,7 +192,7 @@ data BlockResponse = BlockResponse
   { bl_confirmations :: !Integer -- ^ Block confirmations
   , bl_height :: !Integer -- ^ Block height
   , bl_time :: !Integer -- ^ Block time
-  , bl_txs :: ![T.Text] -- ^ List of transaction IDs in the block
+  , bl_txs :: ![HexString] -- ^ List of transaction IDs in the block
   } deriving (Prelude.Show, Eq)
 
 instance FromJSON BlockResponse where
@@ -175,14 +200,15 @@ instance FromJSON BlockResponse where
     withObject "BlockResponse" $ \obj -> do
       c <- obj .: "confirmations"
       h <- obj .: "height"
-      t <- obj .: "time"
+      t <- obj .:? "time"
       txs <- obj .: "tx"
-      pure $ BlockResponse c h t txs
+      pure $ BlockResponse c h (fromMaybe 0 t) txs
 
 -- | Type to represent response from the `zcashd` RPC `getrawtransaction`
 data RawTxResponse = RawTxResponse
   { rt_id :: !HexString
   , rt_hex :: !HexString
+  , rt_shieldedSpends :: ![ShieldedSpend]
   , rt_shieldedOutputs :: ![BS.ByteString]
   , rt_orchardActions :: ![OrchardAction]
   , rt_blockheight :: !Integer
@@ -233,6 +259,9 @@ data TransparentType
   | P2PKH
   deriving (Eq, Prelude.Show, Read)
 
+-- | Type for transparent spending key
+type TransparentSpendingKey = XPrvKey
+
 -- | Type to represent a transparent Zcash addresses
 data TransparentAddress = TransparentAddress
   { ta_type :: !TransparentType
@@ -241,13 +270,44 @@ data TransparentAddress = TransparentAddress
 
 -- * Sapling
 -- | A spending key for Sapling
-type SaplingSpendingKey = BS.ByteString
+newtype SaplingSpendingKey =
+  SaplingSpendingKey BS.ByteString
+  deriving stock (Eq, Prelude.Show, Read)
+
+instance ToBytes SaplingSpendingKey where
+  getBytes (SaplingSpendingKey s) = s
 
 -- | A Sapling receiver
-type SaplingReceiver = BS.ByteString
+newtype SaplingReceiver =
+  SaplingReceiver BS.ByteString
+  deriving stock (Eq, Prelude.Show, Read)
 
--- | A Sapling internal receiver
-type SaplingInternalReceiver = BS.ByteString
+instance ToBytes SaplingReceiver where
+  getBytes (SaplingReceiver s) = s
+
+-- | Type to represent a Sapling Shielded Spend as provided by the @getrawtransaction@ RPC method
+data ShieldedSpend = ShieldedSpend
+  { sp_cv :: !HexString
+  , sp_anchor :: !HexString
+  , sp_nullifier :: !HexString
+  , sp_rk :: !HexString
+  , sp_proof :: !HexString
+  , sp_auth :: !HexString
+  } deriving stock (Eq, Prelude.Show, GHC.Generic, Read)
+    deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)
+    deriving anyclass (Data.Structured.Show)
+    deriving (BorshSize, ToBorsh, FromBorsh) via AsStruct ShieldedSpend
+
+instance FromJSON ShieldedSpend where
+  parseJSON =
+    withObject "ShieldedSpend" $ \obj -> do
+      cv <- obj .: "cv"
+      anchor <- obj .: "anchor"
+      nullifier <- obj .: "nullifier"
+      rk <- obj .: "rk"
+      p <- obj .: "proof"
+      sig <- obj .: "spendAuthSig"
+      pure $ ShieldedSpend cv anchor nullifier rk p sig
 
 -- | Type to represent a Sapling Shielded Output as provided by the @getrawtransaction@ RPC method of @zcashd@.
 data ShieldedOutput = ShieldedOutput
@@ -275,10 +335,20 @@ instance FromJSON ShieldedOutput where
 
 -- * Orchard
 -- | A spending key for Orchard
-type OrchardSpendingKey = BS.ByteString
+newtype OrchardSpendingKey =
+  OrchardSpendingKey BS.ByteString
+  deriving stock (Eq, Prelude.Show, Read)
+
+instance ToBytes OrchardSpendingKey where
+  getBytes (OrchardSpendingKey o) = o
 
 -- | An Orchard receiver
-type OrchardReceiver = BS.ByteString
+newtype OrchardReceiver =
+  OrchardReceiver BS.ByteString
+  deriving stock (Eq, Prelude.Show, Read)
+
+instance ToBytes OrchardReceiver where
+  getBytes (OrchardReceiver o) = o
 
 -- | Type to represent a Unified Address
 data UnifiedAddress = UnifiedAddress
@@ -349,6 +419,11 @@ data DecodedNote = DecodedNote
     deriving anyclass (Data.Structured.Show)
     deriving (BorshSize, ToBorsh, FromBorsh) via AsStruct DecodedNote
 
+-- * Classes
+-- | Class to represent types with a bytestring representation
+class ToBytes a where
+  getBytes :: a -> BS.ByteString
+
 -- * Helpers
 -- | Helper function to turn a hex-encoded string to bytestring
 decodeHexText :: String -> BS.ByteString

src/ZcashHaskell/Utils.hs

@@ -23,12 +23,14 @@ import C.Zcash
   , rustWrapperF4Jumble
   , rustWrapperF4UnJumble
   )
+import Control.Exception (SomeException(..), try)
 import Control.Monad.IO.Class
 import Data.Aeson
 import qualified Data.ByteString as BS
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as E
 import Foreign.Rust.Marshall.Variable
+import Network.HTTP.Client (HttpException(..))
 import Network.HTTP.Simple
 import ZcashHaskell.Types
 
@@ -74,12 +76,12 @@ makeZcashCall username password m p = do
 
 -- | Make a Zebra RPC call
 makeZebraCall ::
-     (MonadIO m, FromJSON a)
+     FromJSON a
   => T.Text -- ^ Hostname for `zebrad`
   -> Int -- ^ Port for `zebrad`
   -> T.Text -- ^ RPC method to call
   -> [Data.Aeson.Value] -- ^ List of parameters
-  -> m (Response a)
+  -> IO (Either String a)
 makeZebraCall host port m params = do
   let payload = RpcCall "2.0" "zh" m params
   let myRequest =
@@ -87,4 +89,16 @@ makeZebraCall host port m params = do
         setRequestPort port $
         setRequestHost (E.encodeUtf8 host) $
         setRequestMethod "POST" defaultRequest
-  httpJSON myRequest
+  r <-
+    try $ httpJSON myRequest :: FromJSON a1 =>
+      IO (Either SomeException (Response (RpcResponse a1)))
+  case r of
+    Left ex -> return $ Left $ show ex
+    Right res -> do
+      let zebraResp = getResponseBody res
+      case err zebraResp of
+        Just zErr -> return $ Left $ T.unpack $ emessage zErr
+        Nothing ->
+          case result zebraResp of
+            Nothing -> return $ Left "Empty response from Zebra"
+            Just zR -> return $ Right zR

test/Spec.hs

@@ -33,7 +33,6 @@ import qualified Data.Text as T
 import qualified Data.Text.Encoding as E
 import qualified Data.Text.Lazy.Encoding as LE
 import qualified Data.Text.Lazy.IO as LTIO
-
 import GHC.Float.RealFracMethods (properFractionDoubleInteger)
 import Test.Hspec
 import Test.Hspec.QuickCheck
@@ -42,8 +41,8 @@ import ZcashHaskell.Keys (generateWalletSeedPhrase, getWalletSeed)
 import ZcashHaskell.Orchard
 import ZcashHaskell.Sapling
   ( decodeSaplingOutput
-  , genSaplingPaymentAddress
   , genSaplingInternalAddress
+  , genSaplingPaymentAddress
   , genSaplingSpendingKey
   , getShieldedOutputs
   , isValidSaplingViewingKey
@@ -55,14 +54,18 @@ import ZcashHaskell.Types
   ( AccountId
   , BlockResponse(..)
   , CoinType(..)
-  , CoinType
   , DecodedNote(..)
   , OrchardAction(..)
+  , OrchardSpendingKey(..)
   , Phrase(..)
   , RawData(..)
   , RawTxResponse(..)
+  , SaplingReceiver(..)
+  , SaplingSpendingKey(..)
+  , Scope(..)
   , Seed(..)
   , ShieldedOutput(..)
+  , ToBytes(..)
   , TransparentAddress(..)
   , TransparentType(..)
   , UnifiedAddress(..)
@@ -315,7 +318,7 @@ main = do
     describe "Seeds" $ do
       it "generate seed phrase" $ do
         s <- generateWalletSeedPhrase
-        BS.length s `shouldNotBe` 0
+        BS.length (getBytes s) `shouldNotBe` 0
       it "get seed from phrase" $ do
         s <- generateWalletSeedPhrase
         let x = getWalletSeed s
@@ -469,11 +472,11 @@ main = do
           let msg = maybe "" a_memo decryptedNote2
           msg `shouldBe`
             "Hello World!\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL\NUL"
-    describe "Wallet seed phrase" $ do
+    describe "Wallet seed phrase:" $ do
       prop "Generated phrases are valid" $ again prop_PhraseLength
       prop "Derived seeds are valid" $ again prop_SeedLength
     before getSeed $
-      describe "Optimized spending key tests" $ do
+      describe "Optimized spending key tests:" $ do
         it "Transparent spending keys are valid" $ \s ->
           property $ prop_TransparentSpendingKey s
         it "Transparent receivers are valid" $ \s ->
@@ -490,7 +493,7 @@ main = do
           property $ prop_OrchardReceiver s
         it "Orchard receivers are distinct" $ \s ->
           property $ prop_OrchardRecRepeated s
-    describe "Address tests" $ do
+    describe "Address tests:" $ do
       it "Encode transparent" $ do
         let ua =
               "u17n7hpwaujyq7ux8f9jpyymtnk5urw7pyrf60smp5mawy7jgz325hfvz3jn3zsfya8yxryf9q7ldk8nu8df0emra5wne28zq9d9nm2pu4x6qwjha565av9aze0xgujgslz74ufkj0c0cylqwjyrh9msjfh7jzal6d3qzrnhkkqy3pqm8j63y07jxj7txqeac982778rmt64f32aum94x"
@@ -501,117 +504,50 @@ main = do
                   maybe "No transparent" (encodeTransparent (ua_net u)) $
                   t_rec u
         msg `shouldBe` "t1LPWuQnjCRH7JAeEErSXKixcUteLJRJjKD"
-    describe "Transparent Private and Public Key Generation" $ do
-      it "Obtain a transparent extended private key from HDSeed" $ do
-        let hdseed =
-              [ 206
-              , 61
-              , 120
-              , 38
-              , 206
-              , 40
-              , 201
-              , 62
-              , 83
-              , 175
-              , 151
-              , 131
-              , 218
-              , 141
-              , 206
-              , 254
-              , 28
-              , 244
-              , 172
-              , 213
-              , 128
-              , 248
-              , 156
-              , 45
-              , 204
-              , 44
-              , 169
-              , 3
-              , 162
-              , 188
-              , 16
-              , 173
-              , 192
-              , 164
-              , 96
-              , 148
-              , 91
-              , 52
-              , 244
-              , 83
-              , 149
-              , 169
-              , 82
-              , 196
-              , 199
-              , 53
-              , 177
-              , 170
-              , 1
-              , 6
-              , 0
-              , 120
-              , 170
-              , 2
-              , 238
-              , 219
-              , 241
-              , 243
-              , 172
-              , 178
-              , 104
-              , 81
-              , 159
-              , 144
-              ] :: [Word8]
-        xtpvk <- genTransparentPrvKey (BS.pack hdseed) MainNetCoin 0
-        let testpvk =
-              XPrvKey
-                0
-                "0000000000"
-                0
-                "fb5b9b89d3e9dfdebeaabd15de8fbc7e9a140b7f2de2b4034c2573425d39aceb"
-                "46aa0cd24a6e05709591426a4e682dd5406de4e75a39c0f410ee790403880943"
-        xtpvk `shouldBe` testpvk
-      it "Obtain a transparent extended public key from private key" $ do
-        let testpvk =
-              XPrvKey
-                0
-                "0000000000"
-                0
-                "fb5b9b89d3e9dfdebeaabd15de8fbc7e9a140b7f2de2b4034c2573425d39aceb"
-                "46aa0cd24a6e05709591426a4e682dd5406de4e75a39c0f410ee790403880943"
-        let testpbk =
-              XPubKey
-                0
-                "00000000"
-                0
-                "fb5b9b89d3e9dfdebeaabd15de8fbc7e9a140b7f2de2b4034c2573425d39aceb"
-                "279bda9c704f6da479cedb12c7cf773b3a348569dc1cfa6002526bad67674fd737b84a2bdb1199ecab1c9fed1b9a38aba5ba19259c1510d733a2376118515cd8"
-        let xtpubkIO = genTransparentPubKey testpvk
-        xtpubk <- xtpubkIO
-          ---print $ show xtpubk
-        xtpubk `shouldBe` testpbk
---    describe "Sapling SpendingKey test" $ do
---      it "Generate Sapling spending key" $ do
---        p <- generateWalletSeedPhrase
---        let s = getWalletSeed p
---        genSaplingSpendingKey <$> s `shouldNotBe` Nothing
-    describe "Sapling Payment Address generation test" $ do
-      it "Call genSaplingPaymentAddress" $ do
-        p <- generateWalletSeedPhrase
+      it "Recover UA from YWallet" $
+        ioProperty $ do
+          let p =
+                Phrase
+                  "security expect junk hour people bind law hub between topic wink cliff spirit scissors auction idle figure option wide useful swift prison cushion round"
+          let targetUA =
+                isValidUnifiedAddress
+                  "u1qsylqauvnhw8tsfe3cldcsj3mjrfqzgaf3mt8yzlkjuvsf5wzj223yvrt8q66qukfqcc80x3z0mk6ym6pm2f0hukzkp6t4wj78h85t6kfr2u9mqsfhdd73g3sc7ezy2ut3rtq5jmejatwv4xqqd6l8tt9fycer8kdw0gz6e607nkssqsc7kd7nk2yfz2hpvpqhdg39wxalpjzhe34j7"
           let s = getWalletSeed p
-        genSaplingPaymentAddress 0 (fromMaybe "" s) `shouldNotBe` Nothing
---      prop "Sapling receivers are valid" $
---        forAll genSapArgs $ \s -> prop_SaplingReceiver s
+          case s of
+            Nothing -> return $ expectationFailure "Failed to generate seed"
+            Just s' -> do
+              let oK = genOrchardSpendingKey s' MainNetCoin 0
+              let sK = genSaplingSpendingKey s' MainNetCoin 0
+              let tK = genTransparentPrvKey s' MainNetCoin 0
+              let oR = genOrchardReceiver 0 External =<< oK
+              let sR = genSaplingPaymentAddress 0 =<< sK
+              tR <- genTransparentReceiver 0 External =<< tK
+              let newUA = UnifiedAddress MainNet oR sR $ Just tR
+              return $ Just newUA `shouldBe` targetUA
+      it "Recover UA from Zingo:" $
+        ioProperty $ do
+          let p =
+                Phrase
+                  "cloth swing left trap random tornado have great onion element until make shy dad success art tuition canvas thunder apple decade elegant struggle invest"
+          let targetUA =
+                isValidUnifiedAddress
+                  "u1trd8cvc6265ywwj4mmvuznsye5ghe2dhhn3zy8kcuyg4vx3svskw9r2dedp5hu6m740vylkqc34t4w9eqkl9fyu5uyzn3af72jg235440ke6tu5cf994eq85n97x69x9824hqejmwz3d8qqthtesrd6gerjupdymldhl9xccejjwfj0dhh9mt4rw4kytp325twlutsxd20rfqhzxu3m"
+          let s = getWalletSeed p
+          case s of
+            Nothing -> return $ expectationFailure "Failed to generate seed"
+            Just s' -> do
+              let oK = genOrchardSpendingKey s' MainNetCoin 0
+              let sK = genSaplingSpendingKey s' MainNetCoin 0
+              let tK = genTransparentPrvKey s' MainNetCoin 0
+              let oR = genOrchardReceiver 0 External =<< oK
+              let sR = genSaplingPaymentAddress 0 =<< sK
+              tR <- genTransparentReceiver 0 External =<< tK
+              let newUA = UnifiedAddress MainNet oR sR $ Just tR
+              return $ Just newUA `shouldBe` targetUA
     describe "Sapling Change Payment Address generation test" $ do
       it "Call genSaplingInternalAddress" $ do
-        let sk =  [ 3
+        let sk =
+              [ 3
               , 183
               , 26
               , 151
@@ -779,82 +715,83 @@ main = do
               , 29
               , 216
               , 48
-                  , 201] :: [Word8]
-        let cAdr = [31, 232, 31, 17, 196, 
-                    178, 208, 227, 206, 
-                    199, 105, 55, 147, 
-                    23, 151, 206, 117, 
-                    59, 249, 162, 218, 
-                    140, 189, 17, 60, 
-                    116, 106, 56, 64, 
-                    203, 152, 52, 155, 
-                    133, 179, 118, 47, 
-                    161, 70, 155, 21, 
-                    22, 41] :: [Word8]
-        let bscAdr = BS.pack cAdr
-        let ca = genSaplingInternalAddress (BS.pack sk)
-        (fromMaybe "" ca)  `shouldBe` bscAdr
-      it "Recover UA from YWallet" $
-        ioProperty $ do
-          let p =
-                "security expect junk hour people bind law hub between topic wink cliff spirit scissors auction idle figure option wide useful swift prison cushion round"
-          let targetUA =
-                isValidUnifiedAddress
-                  "u1qsylqauvnhw8tsfe3cldcsj3mjrfqzgaf3mt8yzlkjuvsf5wzj223yvrt8q66qukfqcc80x3z0mk6ym6pm2f0hukzkp6t4wj78h85t6kfr2u9mqsfhdd73g3sc7ezy2ut3rtq5jmejatwv4xqqd6l8tt9fycer8kdw0gz6e607nkssqsc7kd7nk2yfz2hpvpqhdg39wxalpjzhe34j7"
-          let s = getWalletSeed p
-          case s of
-            Nothing -> return $ expectationFailure "Failed to generate seed"
-            Just s' -> do
-              let oK = genOrchardSpendingKey s' MainNetCoin 0
-              let sK = genSaplingSpendingKey s' MainNetCoin 0
-              let tK = genTransparentPrvKey s' MainNetCoin 0
-              let oR = genOrchardReceiver 0 =<< oK
-              let sR = genSaplingPaymentAddress 0 =<< sK
-              tR <- genTransparentReceiver 0 =<< tK
-              let newUA = UnifiedAddress MainNet oR sR $ Just tR
-              return $ Just newUA `shouldBe` targetUA
-      it "Recover UA from Zingo" $
-        ioProperty $ do
-          let p =
-                "cloth swing left trap random tornado have great onion element until make shy dad success art tuition canvas thunder apple decade elegant struggle invest"
-          let targetUA =
-                isValidUnifiedAddress
-                  "u1trd8cvc6265ywwj4mmvuznsye5ghe2dhhn3zy8kcuyg4vx3svskw9r2dedp5hu6m740vylkqc34t4w9eqkl9fyu5uyzn3af72jg235440ke6tu5cf994eq85n97x69x9824hqejmwz3d8qqthtesrd6gerjupdymldhl9xccejjwfj0dhh9mt4rw4kytp325twlutsxd20rfqhzxu3m"
-          let s = getWalletSeed p
-          case s of
-            Nothing -> return $ expectationFailure "Failed to generate seed"
-            Just s' -> do
-              let oK = genOrchardSpendingKey s' MainNetCoin 0
-              let sK = genSaplingSpendingKey s' MainNetCoin 0
-              let tK = genTransparentPrvKey s' MainNetCoin 0
-              let oR = genOrchardReceiver 0 =<< oK
-              let sR = genSaplingPaymentAddress 0 =<< sK
-              tR <- genTransparentReceiver 0 =<< tK
-              let newUA = UnifiedAddress MainNet oR sR $ Just tR
-              return $ Just newUA `shouldBe` targetUA
+              , 201
+              ] :: [Word8]
+        let cAdr =
+              [ 31
+              , 232
+              , 31
+              , 17
+              , 196
+              , 178
+              , 208
+              , 227
+              , 206
+              , 199
+              , 105
+              , 55
+              , 147
+              , 23
+              , 151
+              , 206
+              , 117
+              , 59
+              , 249
+              , 162
+              , 218
+              , 140
+              , 189
+              , 17
+              , 60
+              , 116
+              , 106
+              , 56
+              , 64
+              , 203
+              , 152
+              , 52
+              , 155
+              , 133
+              , 179
+              , 118
+              , 47
+              , 161
+              , 70
+              , 155
+              , 21
+              , 22
+              , 41
+              ] :: [Word8]
+        let bscAdr = SaplingReceiver $ BS.pack cAdr
+        let ca = genSaplingInternalAddress (SaplingSpendingKey $ BS.pack sk)
+        fromMaybe (SaplingReceiver "") ca `shouldBe` bscAdr
 
 -- | Properties
 prop_PhraseLength :: Property
 prop_PhraseLength =
   ioProperty $ do
     p <- generateWalletSeedPhrase
-    return $ BS.length p >= 95
+    return $ BS.length (getBytes p) >= 95
 
 prop_SeedLength :: Property
 prop_SeedLength =
   ioProperty $ do
     p <- generateWalletSeedPhrase
     let s = getWalletSeed p
-    return $ maybe 0 BS.length s === 64
+    return $ maybe 0 (BS.length . getBytes) s === 64
 
 prop_OrchardSpendingKey :: Seed -> CoinType -> NonNegative Int -> Property
 prop_OrchardSpendingKey s c (NonNegative i) =
   genOrchardSpendingKey s c i =/= Nothing
 
 prop_OrchardReceiver ::
-     Seed -> CoinType -> NonNegative Int -> NonNegative Int -> Property
-prop_OrchardReceiver s c (NonNegative i) (NonNegative j) =
-  genOrchardReceiver j (fromMaybe "" $ genOrchardSpendingKey s c i) =/= Nothing
+     Seed -> CoinType -> NonNegative Int -> NonNegative Int -> Scope -> Property
+prop_OrchardReceiver s c (NonNegative i) (NonNegative j) scope =
+  genOrchardReceiver
+    j
+    scope
+    (fromMaybe (OrchardSpendingKey "") $ genOrchardSpendingKey s c i) =/=
+  Nothing
 
 prop_SaplingSpendingKey :: Seed -> CoinType -> NonNegative Int -> Property
 prop_SaplingSpendingKey s c (NonNegative i) =
@@ -863,32 +800,44 @@ prop_SaplingSpendingKey s c (NonNegative i) =
 prop_SaplingReceiver ::
      Seed -> CoinType -> NonNegative Int -> NonNegative Int -> Property
 prop_SaplingReceiver s c (NonNegative i) (NonNegative j) =
-  genSaplingPaymentAddress i (fromMaybe "" $ genSaplingSpendingKey s c j) =/=
+  genSaplingPaymentAddress
+    i
+    (fromMaybe (SaplingSpendingKey "") $ genSaplingSpendingKey s c j) =/=
   Nothing
 
 prop_SaplingRecRepeated :: Seed -> CoinType -> NonNegative Int -> Property
 prop_SaplingRecRepeated s c (NonNegative i) =
-  genSaplingPaymentAddress i (fromMaybe "" $ genSaplingSpendingKey s c 1) =/=
-  genSaplingPaymentAddress (i + 1) (fromMaybe "" $ genSaplingSpendingKey s c 1)
+  genSaplingPaymentAddress
+    i
+    (fromMaybe (SaplingSpendingKey "") $ genSaplingSpendingKey s c 1) =/=
+  genSaplingPaymentAddress
+    (i + 1)
+    (fromMaybe (SaplingSpendingKey "") $ genSaplingSpendingKey s c 1)
 
 prop_OrchardRecRepeated ::
-     Seed -> CoinType -> NonNegative Int -> NonNegative Int -> Property
-prop_OrchardRecRepeated s c (NonNegative i) (NonNegative j) =
-  genOrchardReceiver j (fromMaybe "" $ genOrchardSpendingKey s c i) =/=
-  genOrchardReceiver (j + 1) (fromMaybe "" $ genOrchardSpendingKey s c i)
+     Seed -> CoinType -> NonNegative Int -> NonNegative Int -> Scope -> Property
+prop_OrchardRecRepeated s c (NonNegative i) (NonNegative j) scope =
+  genOrchardReceiver
+    j
+    scope
+    (fromMaybe (OrchardSpendingKey "") $ genOrchardSpendingKey s c i) =/=
+  genOrchardReceiver
+    (j + 1)
+    scope
+    (fromMaybe (OrchardSpendingKey "") $ genOrchardSpendingKey s c i)
 
-prop_TransparentSpendingKey :: Seed -> NonNegative Int -> Property
-prop_TransparentSpendingKey s (NonNegative i) =
+prop_TransparentSpendingKey :: Seed -> CoinType -> NonNegative Int -> Property
+prop_TransparentSpendingKey s coinType (NonNegative i) =
   ioProperty $ do
-    k <- genTransparentPrvKey s MainNetCoin 0
+    k <- genTransparentPrvKey s coinType i
     return $ xPrvChild k == fromIntegral i
 
 prop_TransparentReceiver ::
-     Seed -> NonNegative Int -> NonNegative Int -> Property
-prop_TransparentReceiver s (NonNegative i) (NonNegative j) =
+     Seed -> CoinType -> Scope -> NonNegative Int -> NonNegative Int -> Property
+prop_TransparentReceiver s coinType scope (NonNegative i) (NonNegative j) =
   ioProperty $ do
-    k <- genTransparentPrvKey s MainCoinNet i
-    r <- genTransparentReceiver j k
+    k <- genTransparentPrvKey s coinType i
+    r <- genTransparentReceiver j scope k
     return $ ta_type r == P2PKH
 
 -- | Generators
@@ -913,3 +862,6 @@ getSeed = do
 -- | Arbitrary instances
 instance Arbitrary CoinType where
   arbitrary = elements [MainNetCoin, TestNetCoin, RegTestNetCoin]
+
+instance Arbitrary Scope where
+  arbitrary = elements [External, Internal]

zcash-haskell.cabal

@@ -5,7 +5,7 @@ cabal-version: 3.0
 -- see: https://github.com/sol/hpack
 
 name:           zcash-haskell
-version:        0.4.4.2
+version:        0.5.1.0
 synopsis:       Utilities to interact with the Zcash blockchain
 description:    Please see the README on the repo at <https://git.vergara.tech/Vergara_Tech/zcash-haskell#readme>
 category:       Blockchain
@@ -53,6 +53,7 @@ library
     , generics-sop
     , hexstring >=0.12.1
     , http-conduit
+    , http-client
     , memory
     , text
     , haskoin-core