Quote from: mailliam on February 21, 2014, 11:48:21 PM

Quote from: rwfreshmore on February 21, 2014, 10:26:07 PM

I just logged into Poloniex to see how things were going and noticed XCP was removed. I bought ~1000 XCP on the 16-17th.

BTC/XCP   Buy   0.0138   521.22052782   7.19284328 BTC   2014-02-17 06:41:52
BTC/XCP   Buy   0.0138   0.51860261   0.00715671 BTC   2014-02-17 02:21:58
BTC/XCP   Buy   0.015822   125.30630705   1.98259639 BTC   2014-02-16 19:09:24
BTC/XCP   Buy   0.015822   94.69369295   1.49824360 BTC   2014-02-16 18:04:32
BTC/XCP   Buy   0.01899   100   1.899 BTC   2014-02-16 17:41:23
BTC/XCP   Buy   0.01898   100   1.898 BTC   2014-02-16 17:41:18
BTC/XCP   Buy   0.017   9.481   0.161177 BTC   2014-02-16 16:26:13
BTC/XCP   Buy   0.017   16.59352784   0.28208997 BTC   2014-02-16 16:26:13

That is over half my total crypto holdings. Gone in a puff of smoke? Fuck me.

I don't even know what's happened. I login today and my XCP is gone. Can someone provide some answers please?

BTC/XCP   Sell   0.012   1   0.012 BTC   2014-02-19 13:51:16
BTC/XCP   Sell   0.012   1   0.012 BTC   2014-02-19 13:51:03
BTC/XCP   Sell   0.012   0.07290725   0.00087488 BTC   2014-02-19 13:50:13
BTC/XCP   Buy   0.0083   10   0.083 BTC   2014-02-18 04:25:28
BTC/XCP   Buy   0.0105   10   0.105 BTC   2014-02-17 23:15:51
BTC/XCP   Buy   0.014   3.605   0.05047 BTC   2014-02-16 19:29:31
BTC/XCP   Buy   0.016   15.96041687   0.25536666 BTC   2014-02-16 19:09:24
BTC/XCP   Sell   0.01789   3.605   0.06449345 BTC   2014-02-16 16:30:32
BTC/XCP   Buy   0.009598   0.00199938   0.00001919 BTC   2014-02-15 23:41:45
BTC/XCP   Buy   0.009897   50.8943114   0.50370099 BTC   2014-02-15 22:58:30
BTC/XCP   Buy   0.009598   10.6   0.1017388 BTC   2014-02-15 22:57:25
BTC/XCP   Buy   0.0096   2.52048139   0.02419662 BTC   2014-02-15 22:57:06

A malicious user used a bug in the protocol to effectively double spend (someone correct me here). He took all the XCP on poloniex and dumped them, then withdrew the BTC. Bug has been patched.

Quote from: qtgwith on February 21, 2014, 05:09:29 AM

Quote from: jimhsu on February 21, 2014, 04:51:01 AM

Quote from: Chuck on February 21, 2014, 04:11:56 AM

Quote from: busoni on February 21, 2014, 02:01:36 AM

The total XCP missing from the wallet--from people who bought from the dump and made hasty withdrawals--is about 7,000 XCP.

I am confused, I thought the hacker double-spent 35,000 XCP yet only 7,000 is missing?

And if he walked away with 80 BTC, but only 7,000 is missing, then he sold 80BTC for 7,000?

I don't understand what happened exactly...

The 35000 spent exploited a protocol bug and thus was reversed (it never existed in the most recent version of the database).

The 7000 constitutes withdrawals by people who sold BTC for XCP and so withdrew the "tainted" XCP. That was not reversed.
The 80 BTC constitutes funds that the hacker withdrew after selling to the above people, and has not been returned yet.

So the parties who were wronged:
- People who bought XCP with BTC, but did not withdraw prior to closing (that would be approximately 35000 - 7000 = 28000 XCP)
- People who deposited XCP who did not mean to sell at those prices (which the hacker did), that would be whatever balance poloniex has right now, minus 28000
- Poloniex, who is losing out on trading and has a loss of confidence

The parties who "benefited":
- People who withdrew XCP that they bought before closing (this is the 7000)
- The hacker, who is up +80BTC

The parties who were unaffected
- People who did not have XCP on poloniex

Ideally, people who withdrew would deposit funds back into the exchange, the BTC would be redeposited, and all trades reversed, which would result in no one gaining or losing anything. However as this is not actually practical, the exchange is currently soliciting donations to try to cover the remainder.

That's the current fund situation right now.

A clear explanation about current situation.

Your currency is not gone. As they were being held by an exchange they have a responsibility to return those funds. They are doing everything they can at the moment. Just sit tight.