We could also technically change everyone's passwords both now and following multi-sig implementation, release the keys, abscond with the BTC, and join the "Market admins steal everyone's money" club. Your argument boils down to "They could rob us, ya know?". Not an original idea and one we have proven we are above. This is no different than your first scenario as it comes to down the same cause. If you are going to rattle off different ways we could scam you, best add a scenario where we just shut down the market and blah blah blah...How about a vulnerability that does not involve us basically being cunts? Thanks. ....sigh. The thing about scenarios is that they generally need to be different. Yes there are actually current implementations that address your concern, being that you seem to think the market itself needs to be taken out of the equation. They are called street-level drug dealing. Care to list possible scenarios for that turning out badly or shall I just direct you to Google so you can look up "drug deals resulting in violence"? Apologies if my post is blunt, but you didn't actually come up with anything that doesn't involve the admins finding various clever ways to scam people. These are not flaws in multi-signature transactions. These are just scenarios where we decide to be assholes. Our actions of late prove otherwise.