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-rw-r--r--src/qt/coincontroldialog.cpp14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index 38c7656e00..70aa9bc8da 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -421,7 +421,19 @@ void CoinControlDialog::updateLabels(CCoinControl& m_coin_control, WalletModel *
std::vector<unsigned char> witnessprogram;
if (out.txout.scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram))
{
- nBytesInputs += (32 + 4 + 1 + (107 / WITNESS_SCALE_FACTOR) + 4);
+ // add input skeleton bytes (outpoint, scriptSig size, nSequence)
+ nBytesInputs += (32 + 4 + 1 + 4);
+
+ if (witnessversion == 0) { // P2WPKH
+ // 1 WU (witness item count) + 72 WU (ECDSA signature with len byte) + 34 WU (pubkey with len byte)
+ nBytesInputs += 107 / WITNESS_SCALE_FACTOR;
+ } else if (witnessversion == 1) { // P2TR key-path spend
+ // 1 WU (witness item count) + 65 WU (Schnorr signature with len byte)
+ nBytesInputs += 66 / WITNESS_SCALE_FACTOR;
+ } else {
+ // not supported, should be unreachable
+ throw std::runtime_error("Trying to spend future segwit version script");
+ }
fWitness = true;
}
else if(ExtractDestination(out.txout.scriptPubKey, address))