Fixes #1823. Witness anchors for input notes no longer cross block boundaries.

src/wallet/asyncrpcoperation_sendmany.h

@@ -14,6 +14,7 @@
 #include "json/json_spirit_value.h"
 #include "wallet.h"
 
+#include <unordered_map>
 #include <tuple>
 
 // TODO: Compute fee based on a heuristic, e.g. (num tx output * dust threshold) + joinsplit bytes * ?
@@ -41,6 +42,12 @@ struct AsyncJoinSplitInfo
     CAmount vpub_new = 0;
 };
 
+// A struct to help us track the witnesses and anchor for a given JSOutPoint
+struct WitnessAnchorData {
+	std::vector<boost::optional<ZCIncrementalWitness>> witnesses;
+	uint256 anchor;
+};
+
 class AsyncRPCOperation_sendmany : public AsyncRPCOperation {
 public:
     AsyncRPCOperation_sendmany(std::string fromAddress, std::vector<SendManyRecipient> tOutputs, std::vector<SendManyRecipient> zOutputs, int minDepth);
@@ -70,7 +77,9 @@ private:
     uint256 joinSplitPubKey_;
     unsigned char joinSplitPrivKey_[crypto_sign_SECRETKEYBYTES];
 
-        
+    // The key is the result string from calling JSOutPoint::ToString()
+    std::unordered_map<std::string, WitnessAnchorData> jsopWitnessAnchorMap;
+
     std::vector<SendManyRecipient> t_outputs_;
     std::vector<SendManyRecipient> z_outputs_;
     std::vector<SendManyInputUTXO> t_inputs_;