[laichzeit0]

I keep asking this over and either I'm missing something or no one knows the answer: The bitcoin devs keep saying that the malleability is a known "feature" since 2011 and that it's MtGox/Bitstamp's problem for searching for transactions based on tx ids. But what the fuck is the point of a tx id, practically speaking, how is it useful at all given that it's malleable?

[o_nate]

It's not malleable once it's been included in the block-chain at a certain depth, before that it is malleable. It appears this was known at least by some people since 2011, but it doesn't seem like the information was widely publicized in a way that would help people to understand the possible consequences. From what I gather, even the reference implementation doesn't handle these consequences particularly well.