Add txrequest module

This adds a new module (unused for now) which defines TxRequestTracker, a data
structure that maintains all information about transaction requests, and coordinates
requests.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/uint256.h b/src/uint256.h
index c55cb31456..ceae70707e 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -126,6 +126,7 @@ public:
     constexpr uint256() {}
     constexpr explicit uint256(uint8_t v) : base_blob<256>(v) {}
     explicit uint256(const std::vector<unsigned char>& vch) : base_blob<256>(vch) {}
+    static const uint256 ZERO;
     static const uint256 ONE;
 };