Add Sapling transaction support.

lib/services/bitcoind.js

@@ -2006,6 +2006,19 @@ Bitcoin.prototype.getDetailedTransaction = function(txid, callback) {
           tx.nExpiryHeight = result.expiryheight;
         }
 
+        // Sapling START
+        if (tx.fOverwintered && tx.version >= 4) {
+          tx.valueBalance = result.valueBalance;
+          tx.spendDescs = result.vShieldedSpend;
+          tx.outputDescs = result.vShieldedOutput;
+          if (result.bindingSig) {
+            tx.bindingSig = result.bindingSig;
+          }
+          // Update tx.feeSatoshis with custom explorer JSON field 'valueBalanceZat'
+          tx.feeSatoshis = tx.feeSatoshis + result.valueBalanceZat;
+        }
+        // Sapling END
+
         self.transactionDetailedCache.set(txid, tx);
         done(null, tx);
       });