Revert "desprout"

This reverts commit 7c6c7150c6.

src/coins.cpp

@@ -628,6 +628,33 @@ bool CCoinsViewCache::HaveJoinSplitRequirements(const CTransaction& tx) const
 {
     boost::unordered_map<uint256, SproutMerkleTree, CCoinsKeyHasher> intermediates;
 
+    BOOST_FOREACH(const JSDescription &joinsplit, tx.vjoinsplit)
+    {
+        BOOST_FOREACH(const uint256& nullifier, joinsplit.nullifiers)
+        {
+            if (GetNullifier(nullifier, SPROUT)) {
+                // If the nullifier is set, this transaction
+                // double-spends!
+                return false;
+            }
+        }
+
+        SproutMerkleTree tree;
+        auto it = intermediates.find(joinsplit.anchor);
+        if (it != intermediates.end()) {
+            tree = it->second;
+        } else if (!GetSproutAnchorAt(joinsplit.anchor, tree)) {
+            return false;
+        }
+
+        BOOST_FOREACH(const uint256& commitment, joinsplit.commitments)
+        {
+            tree.append(commitment);
+        }
+
+        intermediates.insert(std::make_pair(tree.root(), tree));
+    }
+
     for (const SpendDescription &spendDescription : tx.vShieldedSpend) {
         if (GetNullifier(spendDescription.nullifier, SAPLING)) { // Prevent double spends
             LogPrintf("%s: sapling nullifier %s exists, preventing double spend\n", __FUNCTION__, spendDescription.nullifier.GetHex().c_str());