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+// Copyright (c) 2016-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_RBF_H
+#define BITCOIN_UTIL_RBF_H
+
+#include <cstdint>
+
+class CTransaction;
+
+static const uint32_t MAX_BIP125_RBF_SEQUENCE = 0xfffffffd;
+
+// Check whether the sequence numbers on this transaction are signaling
+// opt-in to replace-by-fee, according to BIP 125
+bool SignalsOptInRBF(const CTransaction &tx);
+
+#endif // BITCOIN_UTIL_RBF_H