fix construction check for BTC transactions
fix construction check for BTC transactions

monaparty/counterparty-lib,F483/counterparty-lib,F483/counterparty-lib,monaparty/counterparty-lib,CounterpartyXCP/counterparty-lib,tokenly/counterparty-lib,gotcha/testcounter,jarymoth/counterpartyd,coinwarp/dogeparty-lib,stefcrypto/counterparty-lib,CounterpartyXCP/counterparty-lib