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Reject trailing data in PSBT global unsigned transactions - #1327
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Parse PSBT_GLOBAL_UNSIGNED_TX using the legacy transaction format required by BIP174 and ensure deserialization consumes the entire field value. Add an invalid PSBT vector containing a valid transaction followed by trailing data.
NicolasDorier
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This PR makes PSBTv0 parsing reject a
PSBT_GLOBAL_UNSIGNED_TXvalue when transaction deserialization does not consume the entire declared value as per the BIP174:It also explicitly parses the global unsigned transaction using legacy, non-witness transaction serialization, as required by the BIP.