... but a single "market order" dump of 69K coins triggered the crash.
How do you know the crash was caused by someone dumping 69k coins at market? Is this a verifiable fact or speculation on your part?
If speculation, why do you believe someone did this?
I don't understand who in their right mind would do such thing?
I mean it's a very poor way to sell a position so large, right? Since you will get serious slippage?
Of course there is a verifiable fact. Just check the "trade history" on bitcoincharts or similar, or follow the "time & sales" on
http://bitcoin.clarkmoody.com/. I was trading when that happened, in fact I was very happy because of the unbelievable buying opportunity until Gox fucked up and halted trading to induce "market cooldown". You can check the forums and you will see I was the first one to post about this "market cooldown"
I had to wake up at 4AM to be ready when Gox reopened, just to see how my big buy order at 35€ was not fulfilled for just a couple of euros (bottom in € was 37€). That really pissed me off, I think I should trade in USD, as it's much easier to spot support and resistance points.