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Fixing issuance cases and half blinded cases in PSET #1145

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Aug 18, 2022
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Fixing issuance cases and half blinded cases in PSET #1145

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3 changes: 3 additions & 0 deletions src/blindpsbt.cpp
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Expand Up @@ -476,6 +476,9 @@ BlindingStatus BlindPSBT(PartiallySignedTransaction& psbt, std::map<uint32_t, st
}
}
}
else {
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Prefer to have this as the if, with the existing code in the else. As it is its difficult to see what if this else relates to when reviewing. i.e.

                if (!blind_issuance) {
                    input_asset_blinders.emplace_back();
                } else {

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Also all of your else statements (here and elsewhere) are on new lines which is inconsistent with the rest of the code. Please use

} else {

Instead of

}
else {

Here and in the other changes.

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for code formatting/style wouldn't be better to rely on a GitHub action that enforces shared rules automatically?

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That would make the code harder to rebase over upstream core changes, unfortunately.

input_asset_blinders.emplace_back();
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}
}
}
}
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28 changes: 19 additions & 9 deletions src/psbt.cpp
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Expand Up @@ -123,13 +123,26 @@ CMutableTransaction PartiallySignedTransaction::GetUnsignedTx(bool force_unblind
txin.nSequence = input.sequence.value_or(max_sequence);
txin.assetIssuance.assetBlindingNonce = input.m_issuance_blinding_nonce;
txin.assetIssuance.assetEntropy = input.m_issuance_asset_entropy;
if (input.m_issuance_value != std::nullopt && input.m_issuance_inflation_keys_amount != std::nullopt && force_unblinded) {
// If there is a commitment we should set the value to the commitment unless we are forcing unblinded.
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This code handled blinded vs. unblinded issuances badly. It always tried to blind the issuances, even if they were unblinded issuance assets.

Since there are no fields in the PSET spec to define if an issuance should be blinded or not, we will use the presence of the issuance blinding commitment to tell us what to do.

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@tiero tiero Aug 18, 2022 •
edited
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Not sure is related, but it seems very similar?

#1103

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This looks similar that it may solve the problem. The use case I was trying to solve was an unblinded re-issuance.

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Just tested #1119 which provides a testcase for #1103 and it is not fixed by this

// If we are forcing unblinded but there is no value, we just use the commitment.
if (input.m_issuance_value != std::nullopt && (input.m_issuance_value_commitment.IsNull() || force_unblinded)) {
txin.assetIssuance.nAmount.SetToAmount(*input.m_issuance_value);
txin.assetIssuance.nInflationKeys.SetToAmount(*input.m_issuance_inflation_keys_amount);
} else {
}
else if(!input.m_issuance_value_commitment.IsNull()) {
txin.assetIssuance.nAmount = input.m_issuance_value_commitment;
}
else {
txin.assetIssuance.nAmount.SetNull();
}
if (input.m_issuance_inflation_keys_amount != std::nullopt && (input.m_issuance_inflation_keys_commitment.IsNull() || force_unblinded)) {
txin.assetIssuance.nInflationKeys.SetToAmount(*input.m_issuance_value);
}
else if(!input.m_issuance_inflation_keys_commitment.IsNull()) {
txin.assetIssuance.nInflationKeys = input.m_issuance_inflation_keys_commitment;
}
else {
txin.assetIssuance.nInflationKeys.SetNull();
}
mtx.vin.push_back(txin);
}
for (const PSBTOutput& output : outputs) {
Expand Down Expand Up @@ -531,12 +544,9 @@ bool PSBTOutput::Merge(const PSBTOutput& output)
CTxOut PSBTOutput::GetTxOut() const
{
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This would fail on situations where an asset was blinded but a value was not. I simplified the code to ensure that a value or commitment was checked in the assert (note: this will still crash if you don't provide either, maybe we should't assert?). Then it will use whatever combination of what is given.

assert(script != std::nullopt);
if (!m_value_commitment.IsNull() && !m_asset_commitment.IsNull()) {
return CTxOut(m_asset_commitment, m_value_commitment, *script);
}
assert(amount != std::nullopt);
assert(!m_asset.IsNull());
return CTxOut(CConfidentialAsset(CAsset(m_asset)), CConfidentialValue(*amount), *script);
assert(amount != std::nullopt || !m_value_commitment.IsNull());
assert(!m_asset.IsNull() || !m_asset_commitment.IsNull());
return CTxOut(!m_asset_commitment.IsNull() ? m_asset_commitment : CAsset(m_asset), !m_value_commitment.IsNull() ? m_value_commitment : CConfidentialValue(*amount), *script);
}

bool PSBTOutput::IsBlinded() const
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4 changes: 4 additions & 0 deletions src/wallet/wallet.cpp
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Expand Up @@ -2048,11 +2048,15 @@ TransactionError CWallet::SignPSBT(PartiallySignedTransaction& psbtx, bool& comp
txin.assetIssuance.nAmount = input.m_issuance_value_commitment;
} else if (input.m_issuance_value) {
txin.assetIssuance.nAmount.SetToAmount(*input.m_issuance_value);
} else {
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These variables were never cleared, so they retained the value of the previous loop iteration, which resulted in problems when there were multiple inputs beyond the first issuance, as well as problems when reissuing assets (where there are no inflation keys created).

txin.assetIssuance.nAmount.SetNull();
}
if (!input.m_issuance_inflation_keys_commitment.IsNull()) {
txin.assetIssuance.nInflationKeys = input.m_issuance_inflation_keys_commitment;
} else if (input.m_issuance_inflation_keys_amount) {
txin.assetIssuance.nInflationKeys.SetToAmount(*input.m_issuance_inflation_keys_amount);
} else {
txin.assetIssuance.nInflationKeys.SetNull();
}
if (!input.m_issuance_rangeproof.empty()) {
txinwit.vchIssuanceAmountRangeproof = input.m_issuance_rangeproof;
Expand Down