Quote from: macbook-air on September 17, 2011, 03:11:32 AM

Quote from: tvbcof on September 17, 2011, 02:47:53 AM

Quote from: zhoutong on September 17, 2011, 02:34:18 AM

Quote from: macbook-air on September 16, 2011, 09:10:26 PM

Today, after waking up, I can't access my account of $-950, access denied!
...
I lost around $3500 in two days!

We have blocked your account due to malicious attempt to control prices.
...
In order to protect other Bitcoinica traders from the unexpected and huge fluctuations, we have decided to permanently suspend your account. Your account balance was negative when closed.

To quote Nelson from The Simpsons: "Ha ha".

I am looking forward to macbook-air coming back here and whining like a baby.

I won't whining like a baby as my balance was already "negative".

It was too easy to make money if you have at least a few hundred coins to "control prices". With a simple python script I can double my balance in minutes. It must be the fault of the system, not the fault of the users. I hope you fix your website since I think it is great, and I would like to come back and do some real trades in the future.

希望周总见谅。

Thanks for pointing out the problem.

Yes, it was the fault of the system. Bitcoinica was designed for small trades. And we guarantee up to 50 BTC of liquidity.

Now I have already refined the algorithm for large trades (up to 1,000 BTC). All the trades won't be executed immediately at the same price like before. Instead, large trades have to go through actual market execution. If any fake bids or asks at Mt. Gox have been canceled, the spread will increase and make any remaining limit orders to remain open.

Closing your account is a concern that Bitcoinica is still small, and deliberate attempts which aim to cheat the system have very bad consequences to other customers. (I don't mind losing a few thousand of dollars because of this. But huge fluctuations are going to harm others.)

We will release a version of Bitcoinica in a month. The new version will be another breakthrough in the Bitcoin market. I will reopen your account after the launch of the new version.