Bitcoin Forum

Bug or Hack?

https://i.imgur.com/2KMzR.png]

Check it out now.

tux says its legit.

Huh? Where?

that statement is ridiculous. I have confirmations from dozens of people of DISAPPEARING ASK ORDERS. The system is bugged to hell, so it's NOT LEGIT. tux is out of his mind.

trading has been halted apparently as they investigate the bug

Messed up the charts at bitcoincharts.com quite well... ;)

Interesting that now MtGox seems to get hacked the other way round - probably buying BTC with fake USD?

Unlikely to be a hack of any sort. Not much actual buying happened, ask orders simply disappeared. It's their trading engine that has a serious bug (most likely).

Wasn't there a bug a few weeks ago that halted trading, and when resumed came back at a high of $9.70?

Start the rumor that $1B is trying to go through, and $100 coins are a reality.

Probably a rollback to somewhere between $11 and $11.5 is going to happen.

http://i48.tinypic.com/fnwbgi.jpg

If you have any info or comments, do share.

LOL, these guys have been doing this for couple of years now, and still these weird bugs...

I was a momentary trillionaire.

This resembles the recent btc-e.com hack very much. First USD are injected into the database, then all available btc are bought up and tried to send off the site.

Dammit!
I should have set a sell order for 1000US$, just to catch those, uhm, events! :-)
Since, you know, maybe someone with a lot of BTC messed up.. fat fingers, cat doing the keyboard walk, mixing up "," "." or simply a bot going amok. Knight bot, anyone?

I hope this will be rolled back, though. It messes up all those charts!  :D

Ente

LOL, Microsoft has been writing Windows code for 26 years now, and still these weird bugs...

How is it possible to roll back a glitch like this? since bitcoin transactions are non-reversible, what if someone made 200btc off of this glitch and withdrew his coins?  how could they fix that?

so what is the maximum daily Withdrawal from MtGox?, and multiply it by possibly 100 temporary accounts?

max daily is 200btc.  but, i would guess that more than 100 people withdrew coins

If you hack/steal/obtain a lot of bitcoins through one account, you can only transfer as much as your daily limit to temp accounts too. So that won't help. If you use many temp accounts to begin with, I hope MtGox alarms go crazy. It should look suspicious if hundreds of new, unused accounts (from the same ip maybe?) get loaded with billions of dollars at the same time..

We'll find out.

My guess so far: MTGOX WAS ZHOUTONGED!

(lol)

Ente

So maybe if MtGox had not prevented simultaneous withdrawals from different accounts this might be the biggest Heist?
Bitcoin is worth every penny in entertainment terms.

And you hope that not all of Pirates Coins were stolen.

The 1M$ maximum is not visible on MtGox "High" nor in their own charts.
My sell orders go through too.
Soo, if anyone wants to buy my precious coins for a mere 1k$ the piece? Guaranteed* to have been worth one thousand times as much a few minutes ago!

Ente

Edit:
So, lets see what happens in the next few blocks, huh?
http://www.bitcoinmonitor.com/

*no guarantee given in the sense of guarantee. guaranteed.

I don't use MtGox for trading.

{"ticker":{"high":11.98998,"low":10.95999,"avg":11.192091551,"vwap":11.215697742,"vol":41540,"last_all":11.61217,"last_local":11.7894,"last":11.7894,"buy":11.78939,"sell":11.7991}}

It is legit. I sold 2 BTC for 1 million each. I would have asked for more but that would have been greedy.

If bitcoincharts is correct (and I don't see any reason to not believe this at this moment), the max rate was 1M$, but the volume was around 500 BTC only. That means that there must have been a problem with the order table, all sell orders were dropped (but not the buy orders). As it was empty, someone seems to have actually bought bitcoins at 1M$ a piece. Maybe he only spent a few US-cents on them, just for the heck of it. Or a bot did that tiny, but expensive order. However, it could not have been more than 500 BTC worth either way. Of course the question remains how there was a 1M$ order in the table, when everything else was dropped/lost. Maybe the system thought "hey, a 1M$ trade happened, so all orders lower than that are not supposed to be there.. I better tidy up now!".

Therefore I conclude it was no hack or attack, but "just" a softwareglitch.

Ah, yes, I'm not afraid about the future of Bitcoin any more. It is backed by tons and tons of fun and drama!

Ente

Agreed, it looks more like all the open orders were cancelled than bought.

Tell us, have you still got that 2 million? how does it feel?

Someone found a way to cancel others orders and decided to troll a bit.

Now that, on the other hand, would be very interesting!
If someone could do that, put bitcoins up on MtGox, put a sell order for a relatively high price, and cancel all other orders beneath it. Eventually he would sell them. Then buy cheaper bitcoins back, cash out.
Of course that would be noticed quickly too..

Ente

It's an issue with disappearing ask orders. And because of that price is climbing. There's almost non-existing ask side at times :-)

To me it seems like they are coming back?
Can't say for sure though, clarkmoody doesnt work here atm.
What is happening *now*? Still twilight-zone, or everything back to normal?

Ente

What is happening *now* is that trade are flowing again.  However, The price was not rolled back to when I and others noticed our sell orders disappeared.  It seemed to just resume when trading stopped at about $11.80.  If you can't use clarkmoody I would suggest btccharts.com as a backup.

Unless you're an old-fashioned Brit, 1,000,000,000 is a BILLION, not a million.  Big difference - lol.

I think that simply resuming was a fine call. All of the actual trades that happened were legit after all and the whole scenario didn't go on for very long. Rolling back would perhaps be too much for something that actually did so little.

Other than messing up all the online price charts, lol...

Must be real!:
http://we.lovebitco.in/img/billionbtc.png

Maybe the software is written so that if there are no asks at all, Gox considers the price to be $1,000,000,000, and a momentary lack of sanity in the computer system made all the ask orders disappear. However, one would think that a trade would actually need to be executed at that price for it to register. One should be able to roll through the trade records and see if this actually happened, I'm currently downloading complete trade history to discover the trade that set this.

Edit, looking at http://mtgoxlive.com/orders, it looks like all the sell orders went *poof* permanently, there is little depth there from few people putting sells back in.

But think about all those sell orders, that have not been fulfilled at a lower price. Now those coins have to be sold at a higher price and the result is some highly unwanted profit for those poor bears. Maybe they can throw out MtGox USD codes to restore their bearish balance. ;D

Someone mind posting what Tux wrote about the legit transaction he decided to reverse and halt trading as a result of?  :P  :)

They just removed the mtgoxUSD of the list: http://bitcoincharts.com/markets/

LOL. Trading resumed and... the problem still persists. Nice job Gox.

sell orders disappeared again.

Yup

rollback on price chart at MtGox, happened again.

I've seen prices higher than 12.50$ but High on Gox is below 12$. Weird.

This is a bad day to be actually trying to sell coins, it seems...  You see the high price, move money into the mountain and then your sell orders disappear before they can be filled...  or else your transactions are rolled back.  :(

It's a good day to tell your bot to put in $1,000,000,000 sell orders every second. Some other bot might "taste" them.

I thought this was going to be another thread where someone decided to divide the world economy by the number of bitcoins to deduce what they "should" be worth.

That exact scenario happened to me twice this morning.

Any $1,000,000,000 trade should be around 5:40, but the data is missing. Either there was no trade, or it was rolled back a bit so a trader wasn't stuck buying at that price):

mtgoxUSD,2012-08-09,05:39:50,1344515990,11.75019,0.35
mtgoxUSD,2012-08-09,05:39:50,1344515990,11.74039,0.35
mtgoxUSD,2012-08-09,05:39:50,1344515990,11.73059,0.35
mtgoxUSD,2012-08-09,05:39:50,1344515990,11.72079,0.35
mtgoxUSD,2012-08-09,05:39:50,1344515990,11.71099,0.15
mtgoxUSD,2012-08-09,05:39:51,1344515991,11.7894,0.01 (last trade)
mtgoxUSD,2012-08-09,06:17:16,1344518236,11.79906,0.01
mtgoxUSD,2012-08-09,06:17:18,1344518238,11.7991,4.21
mtgoxUSD,2012-08-09,06:17:18,1344518238,11.8,4.41
mtgoxUSD,2012-08-09,06:23:46,1344518626,11.78939,5.0
mtgoxUSD,2012-08-09,06:23:46,1344518626,11.71099,0.2
mtgoxUSD,2012-08-09,06:23:47,1344518627,11.70119,0.35

I took the $1B trade out of my database. I might just have to re-scan from Gox to see what else has changed. For instance, I'm still showing a few coins changes hands above $12.75.

What was the amount of the $1B trade?  (How many coins at that price?)  Just curious...

Hello,

Please find our announcement regarding this issue below.

Hello Mt.Gox Users,

Trading was unavailable for a short period of time today.  There were invalid trades taking place as well as trade orders that could not be cancelled.  Therefore we had to halt the trading engine and consequently, most ask orders were cancelled.

However, we have resolved this issue and trading has now resumed. Invalid trades have been cancelled and trade orders can now be cancelled. Users who have had their ask orders cancelled are kindly requested to place their orders again.

We apologize for the inconvenience caused and we will make every effort to prevent this from happening again in the future.  Thank you for your continued support to Mt.Gox.

UPDATE:  After investigating, we found out that the issue is likely due to an old piece of code in the trade engine that checks for bid/ask cross (i.e. negative spread). This piece of code would check for bids and asks differences, but did not make sure that both were in the same currency.

To prevent this bug issue from recurring, we have placed some extra checks to halt trading automatically should a similar issue happen again. Thank you once again for your kind understanding in this matter.

UPDATE 2:  It appears that some new trade engine features that were rolled into production earlier today caused this bug to become possible. We have now found the exact cause and resolved this bug.
We now are 100% confident that today's problem was due to a technical glitch and we would like to assure that it was not caused by any malicious attempts.

Source: https://support.mtgox.com/entries/21845378-resolved-outage-35046-trading-unavailable

The live trade stream was capped in the first post of this thread:
https://bitcointalk.org/index.php?topic=99558.0

It looks like there was just one kooky trade and then normal trading continued. The value is 0 or too small to be shown.

Just too small. A zero trade is not allowed by the trade system.

I have cleared the cancelled trades and rebuilt the bars affected by those trades. So the charts should look normal again.

You MG guys are on crack. LOL

Next glitch: $1 trillion/btc!

It's annoying that sell orders placed after the glitch were unceremoniously deleted.

I placed some before going to sleep..  grr.

It would be nice to have the option to have SMS alerts if customer data is being 'deleted' or rolled back for some bizarre reason.

+1

Just started reading this thread and this is the first thing I thought of when I got to post 2.


I was just thinking about you: https://bitcointalk.org/index.php?topic=96080.msg1090175#msg1090175

~Bruno~