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diff --git a/src/consensus/tx_verify.h b/src/consensus/tx_verify.h
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+// Copyright (c) 2017-2017 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_CONSENSUS_TX_VERIFY_H
+#define BITCOIN_CONSENSUS_TX_VERIFY_H
+
+#include <stdint.h>
+#include <vector>
+
+class CBlockIndex;
+class CCoinsViewCache;
+class CTransaction;
+class CValidationState;
+
+/** Transaction validation functions */
+
+/** Context-independent validity checks */
+bool CheckTransaction(const CTransaction& tx, CValidationState& state, bool fCheckDuplicateInputs=true);
+
+namespace Consensus {
+/**
+ * Check whether all inputs of this transaction are valid (no double spends and amounts)
+ * This does not modify the UTXO set. This does not check scripts and sigs.
+ * Preconditions: tx.IsCoinBase() is false.
+ */
+bool CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight);
+} // namespace Consensus
+
+/** Auxiliary functions for transaction validation (ideally should not be exposed) */
+
+/**
+ * Count ECDSA signature operations the old-fashioned (pre-0.6) way
+ * @return number of sigops this transaction's outputs will produce when spent
+ * @see CTransaction::FetchInputs
+ */
+unsigned int GetLegacySigOpCount(const CTransaction& tx);
+
+/**
+ * Count ECDSA signature operations in pay-to-script-hash inputs.
+ * 
+ * @param[in] mapInputs Map of previous transactions that have outputs we're spending
+ * @return maximum number of sigops required to validate this transaction's inputs
+ * @see CTransaction::FetchInputs
+ */
+unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& mapInputs);
+
+/**
+ * Compute total signature operation cost of a transaction.
+ * @param[in] tx     Transaction for which we are computing the cost
+ * @param[in] inputs Map of previous transactions that have outputs we're spending
+ * @param[out] flags Script verification flags
+ * @return Total signature operation cost of tx
+ */
+int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& inputs, int flags);
+
+/**
+ * Check if transaction is final and can be included in a block with the
+ * specified height and time. Consensus critical.
+ */
+bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime);
+
+/**
+ * Calculates the block height and previous block's median time past at
+ * which the transaction will be considered final in the context of BIP 68.
+ * Also removes from the vector of input heights any entries which did not
+ * correspond to sequence locked inputs as they do not affect the calculation.
+ */
+std::pair<int, int64_t> CalculateSequenceLocks(const CTransaction &tx, int flags, std::vector<int>* prevHeights, const CBlockIndex& block);
+
+bool EvaluateSequenceLocks(const CBlockIndex& block, std::pair<int, int64_t> lockPair);
+/**
+ * Check if transaction is final per BIP 68 sequence numbers and can be included in a block.
+ * Consensus critical. Takes as input a list of heights at which tx's inputs (in order) confirmed.
+ */
+bool SequenceLocks(const CTransaction &tx, int flags, std::vector<int>* prevHeights, const CBlockIndex& block);
+
+#endif // BITCOIN_CONSENSUS_TX_VERIFY_H