diff options
Diffstat (limited to 'src/primitives/transaction.h')
| -rw-r--r-- | src/primitives/transaction.h | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h index 5a58241347..e87ad90f0d 100644 --- a/src/primitives/transaction.h +++ b/src/primitives/transaction.h @@ -13,6 +13,8 @@ static const int SERIALIZE_TRANSACTION_NO_WITNESS = 0x40000000; +static const int WITNESS_SCALE_FACTOR = 4; + /** An outpoint - a combination of a transaction hash and an index n into its vout */ class COutPoint { @@ -166,15 +168,30 @@ public: // which has units satoshis-per-kilobyte. // If you'd pay more than 1/3 in fees // to spend something, then we consider it dust. - // A typical spendable txout is 34 bytes big, and will + // A typical spendable non-segwit txout is 34 bytes big, and will // need a CTxIn of at least 148 bytes to spend: // so dust is a spendable txout less than - // 546*minRelayTxFee/1000 (in satoshis) + // 546*minRelayTxFee/1000 (in satoshis). + // A typical spendable segwit txout is 31 bytes big, and will + // need a CTxIn of at least 67 bytes to spend: + // so dust is a spendable txout less than + // 294*minRelayTxFee/1000 (in satoshis). if (scriptPubKey.IsUnspendable()) return 0; - size_t nSize = GetSerializeSize(SER_DISK,0)+148u; - return 3*minRelayTxFee.GetFee(nSize); + size_t nSize = GetSerializeSize(SER_DISK, 0); + int witnessversion = 0; + std::vector<unsigned char> witnessprogram; + + if (scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) { + // sum the sizes of the parts of a transaction input + // with 75% segwit discount applied to the script size. + nSize += (32 + 4 + 1 + (107 / WITNESS_SCALE_FACTOR) + 4); + } else { + nSize += (32 + 4 + 1 + 107 + 4); // the 148 mentioned above + } + + return 3 * minRelayTxFee.GetFee(nSize); } bool IsDust(const CFeeRate &minRelayTxFee) const @@ -442,4 +459,7 @@ struct CMutableTransaction uint256 GetHash() const; }; +/** Compute the cost of a transaction, as defined by BIP 141 */ +int64_t GetTransactionCost(const CTransaction &tx); + #endif // BITCOIN_PRIMITIVES_TRANSACTION_H |