Topic: ★★★ Bitcoin Video Casino ★★★ - ||| Over 500 BTC in Progressive Jackpots! ||| - page 51. (Read 143509 times)

I will try my best to show what we know regarding Unibtc4real's account.

First things first, cheating is absolutely not allowed on this site. If you get caught cheating, you lose your account and all coins. We are very clear about that in the terms of service. We never cheat our users, and expect the same in return.

Below is an example of a recent double spend on BVC:

https://archive.is/hR49i

The 2.1 BTC was sent to 16nuq6EU9wRgpXK9BLN1iz5hEWb2Xg966o which is a deposit address on our site. The transaction has a very miners low fee of only 0.000001  BTC, which means that it will generally take a long time for the transaction to get confirmed.

However, this is the transaction that actually got confirmed:

https://archive.is/T1lGY

This new transaction has a higher miner's fee, and because it made it into the blockchain, it invalidates the first transaction.

This means that the user was able to credit his account on our site, play the games on our site, and then invalidate the transaction as though it never happened.

The reason why the user decided to try to invalidate the first transaction is that he played a single 2.1 BTC game of Dice and then lost. He can then revert the transaction and get his coins back. If he were to win in that game of Dice, he just lets the original transaction continue until it confirms and eventually he can withdraw his winnings.

In the past few days we were able to find quite a few double spend attempts with similar deposits, mostly coming from a handful of addresses. We were able to stop most of the attacks by making it impossible for the user to withdraw his winnings.

A lot of the double spend attacks were coming from this particular address:

https://archive.is/5bTKf

If you follow through some of the transactions you can see that blockchain.info is declaring them to be double spends.

So, we know without a doubt that some accounts were used for double spends. We can then compare these invalid accounts with the account that unibtc4real claims is legitimate, to see what similarities there are. If there are enough similarities, it should then be possible to associate this account with all of the other illegitimate ones, and declare this to be an attempted double spend.

I will list those similarities now:

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The double spend accounts all used a tiny 0.000001 BTC miner's fee. Unibtc4real's account also used a 0.000001 BTC fee.

The double spend accounts were created around the same time as Unibtc4real's account.

The double spend accounts played Dice, betting the full balance in giant bets. The double spend accounts would bet 10+ BTC in single bets. Unibtc4real's account also played dice for enormous bets. His account has giant bets for 11, 12, 13+ BTC. It is rare (and risky!) for our users to make such giant bets on our site. The reason for doing this in a double spend attack is to quickly win or lose the coins so that you have enough time to undo the transaction if you lose.

The double spend accounts mostly played Dice with about an 80% chance of winning. Unibtc4real's account also played Dice at the 80% win setting.

The double spend accounts sent me emails as two different people saying that their funds were locked. However, I was able to see that they are the same person, since both of those double spend accounts were funded by 18zRryZwo7KefNGiFM5SLBsMVZA4TPwaLd . So the double spend user has no problem sending emails pretending to be someone else. Unibtc4real also sent me emails saying that his funds were locked, but he accidentally used two different email accounts with two different names, despite the conversation continuing as though he were the same person. So the double spend users and Unibtc4real both switch between different aliases.

The double spend emails were sent at 7:56 and 8:27 am (EST). Unibtc4real sent his emails at 7:46, 8:02, and 8:51. So if you sort the timing of the emails, you get 7:46, 7:56, 8:02, 8:27, 8:51. These times are all very close to each other, and could imply that it is the same person writing all emails within the same timespan.

=======

Each single piece of evidence is not strong enough to claim that Unibtc4real's account is associated with with the double spenders (the accounts that we 100% KNOW were double spending). But taken together, all of these similarities lead us to believe that Unibtc4real's account is controlled by the same person that controlled the double spend accounts.

So that's what we know. Any feedback would be great!

It is ridiculous to hold his money using double spent attack, he won 4 btc from you and you hold his principal and winning, this excuse is not good because even he attacked you, he was indeed winning on your site, but you just eat his money and profit, no way to hold his 14 btc, even if he attacked you, and how many did you lose on the attack??

A real attacker and hacker won't be stupid like this, he won a lot money from attack, and continue deposit 10btc money, which hack is so silly like this?

Sure, I'll explain it.  You control two addresses, A and B.  A has some balance.  You create a transaction with some casino that credits your balance with 0 confirmations as the recipient which we'll call Tx1.  You create another transaction using the same inputs as Tx1 with B as the recipient which we'll call Tx2.  Broadcast Tx1.  As soon as the casino credits your balance, you place a bet.  If you win, wait to confirm and withdraw.  If you lose, broadcast Tx2.

This won't work most of the time, because all things equal, Tx1 will propagate through the network quicker.

To make it work better, include a below standard or no fee in Tx1, and a normal or above average fee in Tx2.  Include a blacklisted address in Tx1 like satoshidice but not Tx2 and broadcast Tx2 directly to a miner that utilizes a blacklist (referring to LukeJr here, though not sure if he still does this).  If the site runs its own node, you could peer with that node, broadcast Tx1, and then utilize some kind of dos attack in combination with the double spend attack to increase your chances.

There's still luck and timing involved, but with the 1% or less edge many casinos are running these days, it could be enough to push a game +EV.

I'll be watching to see the resolution in this.

Can we elaborate more on how the double-spending attack would actually work against the casino? The deposit requires 2 confirmations before you are able to withdraw and a double-spend wouldn't get confirmed?

The blockchain transaction says otherwise.. This deposit was not double spent nor any of the previous transactions from the originating addresses.. And double spending would mean i would have more than 50% of the bitcoin network to be able to perform it lol.. https://en.bitcoin.it/wiki/Double-spending

Anyway, I can see from the transaction that the 10BTC deposit was already moved, probably to you hot/cold wallet.. You got the bitcoins, and yet still refuses to unlock my balance..

You can't blame people for worrying about their $3,446+- worth of bitcoins being stucked, locked, stolen, scammed, frozen etc...

I really hope this will get fixed soon.. And like you said from your previous replies, i think its good to require 1 confirmation for deposits like other casinos do.

Hi,

We are working on resolving this issue. If your account is in good standing then you will of course get your coins back. Unfortunately, there is too much evidence right now which leads us to believe that this account may have been used in a double spend attack.

We are not happy about this either. We just want everyone to have a good time on the site, but issues like this make it difficult. We always worry about users trying to cheat the website, which is a bit of a bummer.

Bitcoin Video Casino has been around for 2+ years and has never tried to cheat its users in any way. It would be ridiculous to throw all that away for 14 BTC. If you did nothing wrong then you have nothing to worry about and you will get your coins back.

Site went down for maintenance and now its back up, and my balance is still in red and locked.. OP has not provided anything but a speculation that the said account is double spent..

I will make a scam accusation with negative trust in few hours if this issue is not resolved.. We are talking a good sum of btc here..Let me cashout..

If you think that i will just let this go and play till i bust, No... My balance is still locked with no reason at all.. We are talking about 14 btc here...

We can clearly see on the https://blockchain.info/address/1PbKZZXPLVLzfhsKQxtXjujRa2a5vmpb9p that this deposit was confirmed and was not "double spent".. any previous transactions from the originating address also shows no kind of "double spent" transactions. The transaction also has a fee in which it prevents from being "double spent". You also can't reason out the location since i do use vpns to log and play on different sites.

You can't just hold someone else bitcoins for the speculation of cheating. If you guys are getting "double spend" attacks which i think is very hard to do, then im sorry to hear that, maybe you should put up more security to battle that kind of attack.

In the last few days we have had problems with users double spending Bitcoins in order to try to cheat the site. This particular account shows very strong evidence of being a part of the double spend attacks.

We are now looking into the problem.

The unfortunate truth is that in the future we may have to require confirmations for all deposits in order to prevent the selfish actions of a few bad people, which really makes us quite sad.

LOL, you really think this casino pays to jackpot winners?

I doubt that guy is a shill or admin himself, he said he got 3 times jackpots, don't you think is this too fishy? And that guy got 3 time biggest jackpot, and never seen others got it.

I know many casinos have shill accounts to pretend someone got big winnings, but they are all fake winnings, don't tryst them.

Ok I see you went online and refused to reply to my issue.

Name:    BitcoinVideoPoker
Posts:    392
Activity:    392
Position:    Sr. Member
Date Registered:    December 09, 2012, 06:42:03 AM
Last Active:    Today at 01:05:50 PM


I deposited 10 BTC and have won 4 BTC.. And you wont let me cashout. I don't know what the issue is, since on previous replies you pay big amounts on jackpot winners. People can clearly see the transaction has confirmations.. (check my previous post for the screenshot)

Hope this wont end to a bad reputation and a scam accusation. 

Thanks

Im having issues with my balance. I have deposited and won some, but my account balance is still in RED. which means i still cant cashout even with more than 9 confirmations.

I have sent multiple emails to [email protected] and i received no response.

The deposit address on my account is 1PbKZZXPLVLzfhsKQxtXjujRa2a5vmpb9p, which clearly shows confirmations on the blockchain.

Posted screenshot below

When I asked the question it was the first time I have actually looked at the bonus amount when switching bet sizes.  I don't think the jackpot amount shows different unless I click on it after I switch my bet size.   I understand now though.  Thanks!

That's correct. The jackpots that are shown in the list are based on the absolute size of the prize paid out. This unfortunately means that the big wins list now mostly just shows the huge 0.2 BTC Slots jackpots... :/

So the .0001 jackpot got pretty high the last couple of days.  It was around 4BTC.   Is that why it doesn't show on the Big win list?  Because it is so small compared to the higher bet jackpots?

Lucky guy! I hope I will something to boast of soon!

We just had a nice 44.596 BTC jackpot on 0.001 BTC Slots. Congratulations user 0e584b5206!

However the best strategy is probably not to resort to to much risk.