The Selfish Mining Attack:
https://twitter.com/cypherdoc2/status/521321978037555200Until Emin releases his code hack and it is found to be valid in practice, I think he should stop making public appearances with talks that essentially scare Bitcoin miners. This is what occurred this weekend at Hashers United.
Yeah, the problem is the degree to which he's beat the "doom" drum about this. Academics are often prone to the "it's not perfect, therefore it's crap" attitude, which is annoying (and naive). That said, the sooner academically-verified issues, including SM, are addressed, the better.
he's using a very lame excuse that he doesn't want to be overly criticized on bitcointalk if he releases his code that supposedly leads to Bitcoiner's losing money.

yet he doesn't realize he's costing Bitcoiner's money by talking in public about what he's
sure is a fundamental flaw in mining. yet, the only reason he has confidence to talk in public is b/c his hack has not been thoroughly vetted. he doesn't want to have his code hack vetted by the world community at large like the hackers of the Heartbleed and Bash bug were willing to do. his hack has been buried for almost a year. we need to get this out and once and for all bury this festering doubt.
the other way he causes Bitcoiner's to lose money is to the degree that altscam investors believe him. i saw this firsthand this weekend. "oh see, Bitcoin has this major flaw therefore i will invest in this altcoin". he claims his hack has been vetted by a few core devs. that may or many not be. that's still not equivalent to releasing it into the wild for vetting according to open source principles.