checking transaction hashes for acceptance into the blockchain was a stupid idea to begin with. clearly the data in a transaction is malleable without affectin

checking transaction hashes for acceptance into the blockchain was a stupid idea to begin with. clearly the data in a transaction is malleable without affecting the signature. given that mtgox already were using non-canonical transactions, they should have been aware of this. a transaction only becomes immutable once it has been included in the blockchain. after this point, searching for a tx by hash is ok. calling this a bug of the bitcoin protocol is akin to saying that array decay in C is a bug in the language spec. it is known, and and has been talked about for a long time. in both cases.