track double spending in the txpool

Transactions in the txpool are marked when another transaction
is seen double spending one or more of its inputs.
This is then exposed wherever appropriate.

Note that being marked with this "double spend seen" flag does
NOT mean this transaction IS a double spend and will never be
mined: it just means that the network has seen at least another
transaction spending at least one of the same inputs, so care
should be taken to wait for a few confirmations before acting
upon that transaction (ie, mostly of use for merchants wanting
to accept unconfirmed transactions).

1 files changed, 2 insertions, 0 deletions

diff --git a/src/wallet/wallet_rpc_server_commands_defs.h b/src/wallet/wallet_rpc_server_commands_defs.h
index ffc2e2d49..06f2456c3 100644
--- a/src/wallet/wallet_rpc_server_commands_defs.h
+++ b/src/wallet/wallet_rpc_server_commands_defs.h
@@ -794,6 +794,7 @@ namespace wallet_rpc
     std::string type;
     uint64_t unlock_time;
     cryptonote::subaddress_index subaddr_index;
+    bool double_spend_seen;
 
     BEGIN_KV_SERIALIZE_MAP()
       KV_SERIALIZE(txid);
@@ -807,6 +808,7 @@ namespace wallet_rpc
       KV_SERIALIZE(type);
       KV_SERIALIZE(unlock_time)
       KV_SERIALIZE(subaddr_index);
+      KV_SERIALIZE(double_spend_seen)
     END_KV_SERIALIZE_MAP()
   };