Implement Sapling decoding

src/ZGoBackend.hs

@@ -1836,7 +1836,7 @@ scanTxNative pipe db nodeUser nodePwd = do
             blockList <-
               mapM
                 (getBlockInfo nodeUser nodePwd . T.pack . show)
-                [2243000 .. (bl_height lB)]
+                [((bl_height lB) - 50) .. (bl_height lB)]
             print "filtering blocks..."
             let filteredBlockList = filter filterBlock blockList
             print "extracting txs from blocks..."
@@ -1876,19 +1876,21 @@ scanTxNative pipe db nodeUser nodePwd = do
           return Nothing
     checkTx :: [RawTxResponse] -> T.Text -> IO ()
     checkTx txList' k = do
+      let sOutList = concatMap rt_shieldedOutputs txList'
       if isValidSaplingViewingKey (E.encodeUtf8 k)
         then do
           print "decoding Sapling tx"
-          print txList'
+          let decodedSapList' =
+                map
+                  (decodeSaplingOutput (bytes (decodeBech32 $ E.encodeUtf8 k)))
+                  sOutList
+          print decodedSapList'
         else do
           let vk = decodeUfvk $ E.encodeUtf8 k
           case vk of
             Nothing -> print "Not a valid key"
             Just v -> do
-              let decodedSapList =
-                    map
-                      (decodeSaplingOutput (s_key v))
-                      (concatMap rt_shieldedOutputs txList')
+              let decodedSapList = map (decodeSaplingOutput (s_key v)) sOutList
               print decodedSapList
               let decodedOrchList =
                     map