Topic: The Bitcoin Blackjack ♦️ Bitjack | Try the Beta (Read 490 times)

Because they have limited funds, their max bet is 10 bits only at the moment which is also the min bet. I have no idea how this site can survive in the industry. Players are limited to play, even small players wont be able to use any strategy as they will only able to play the same amount all the time. The idea of having on chain blackjack game is good, but the lack of funds make it fails.

Congrats for your winning, but it's too early to say this casino isn't scam. Literally 10,000 sats only worth $5, if they scam you only for $5 it's really stupid to be honest I don't know they will let you withdraw higher than 10,000 sats because based on his twitter he only write "Win 0.0001" and "Win 0.00005" from the promo code. The funny thing the code only work for the first person use it.

ATTENTION : this site NOT SCAM 
I've got code from admin , he so nice . first time i thought 10 bits for bet = 10 sats until I make withdraw 100 bits for testing and i got 10,000 sats ( 0.0001 btc ) instantly    that is time  i realize i should play more carefully and earn more winnings .
That is all of my story   

I think the same, in fact the mBTC option is much more accessible and most players understand it, I personally am a bit confused what it has to do with Bits, although it sounds silly I think that the brain immediately processes seeing the balance of bets and balances in mBTC, maybe we are used to that most of the platforms establish it that way, but I think it is more comfortable and also more pleasant to look at. This is like when you fall in love, it is done first through sight, what you observe what you always want to see, and even if it goes wrong because you are still there because you already have an affinity, seeing it from that point of view I think it is the best analogy.

Connect with TC
And he help withdraw money.
He is not scammer, all is good.

That's exactly why I said it would be better if you did such a test run in a controllable environment.
It is clear that the first person who tries to examine the site for weaknesses in order to harm you is not long in coming. 

There is an update on the main post:


It is clear and you can do nothing indeed except waiting till the owner fix everything and activate the options to deposit/play/withdraw back. I think the owner did not expect the issue and he is not ready for this. I am wondering, is he still own some money for the bankroll?

How much money you deposit on this casino? It's obvious that this is new and there are some major adjustments needed on the website so expect this kind of error when trying out a casino that's on testing phase. I hope that you didn't deposit huge sum of money because the owner has no commitment at all and you are not protected since this has no license at all.

This idea of no registration is cool and very good fro gambler since most of them are lazy, They can try out immediately the site right when you visit. The only problem was there's no play money available to try out the casino feature, I hope that devs will introduced that later on the future development. I missed directbet.eu when I view this website.

now withdraw dont work, deposit too.
max bet = 0 bits.
thats all? you closed?

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TC, maybe you can give some information???
I still have 1600 bits on account and cant do nothing


[moderator's note: consecutive posts merged]

Sorry, but it doesn't look to me like everything has been 100% thought through.
I think the idea is basically great, and if there are serious intentions behind this project, I think it's even better.

One idea would have been to test everything first with Testnet-Bitcoin.
Then, for example, find a few testers here in the forum, to find possible bugs and give feedback for a small payment.

I wish you good luck with your project.

cant withdraw any, get error. maybe you dont have money?

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and max bet now 10 bits?? omg 10 bits...it too small for betting

Hmm, I used bits because I didn't want to use fractions or  numbers too big for bets.
But maybe the use of mBTC can be good for larger bets.

I've change message, hehe, it was a silly idea, 

Thank you for sharing the house edge calculator, I'll use it  also I'll post the blackjack rules that I implemented.

Thanks to the people requesting promo codes,  
please request them on my twitter(https://twitter.com/Mitosys3)

This is the last piece of information about the codes:


Since the new codes haven't been released yet, it's easy to guess that something still is being improved on the website. A little patience..

may i ask what is promo code ?

But it would be almost impossible to win 2000, right now the maximum bet it is only 50 (I will increase it soon).

I don't know about the other players, but this form of registration seems extremely dangerous to me. It is possible that for someone it will be a very convenient form of registration, but I am afraid to deposit money at an address that is not even secured with a password.

I think that using mBTC (milibits) and sats would be a better idea than Bits, more people are familiar with them from other betting websites.
Better remove that sign Don't hack us from top left corner, and it will motive people more to really try and hack you.

In this case, the bankroll is effectively his pocket. While his expected profit is the house edge multiplied by the bet, his actual profit depends on how the bets end up going. If he did profit 10,000 bits from a losing bet, there's nothing stopping him from taking them as profit. Expected profit is simply the expected value of each bet and doesn't represent exactly what will happen as users play bets.


Losing all of your balance doesn't mean that there's a house edge. It could very well be a result of variance, especially if the house edge is close to 0% (either positive/negative). You also had a very very small sample size.


I can't seem to find the rules used by your game of blackjack. If you know what they are, you can plug all of the values into a blackjack house edge calculator to figure out what kind of edge you have. If the set of rules is unique, your best bet might be to run a very large number of simulations to determine what your house edge is approximately.

give another promocode

I think you should close the project and not waste your time and money.
I don't see any point in playing in your project.
If I borrow $ 1000 and win $ 2000, I understand that I will not be able to withdraw.
I generally keep quiet about the maximum rate.

I used your second promo code to do successive 50bit max bets - inside the same room I used last time - until I went bust. Ended up losing it all after just 2 hands 

Try running a test version of your casino locally, generate and keep betting 10bits bets, like 5000 of them, then record how many of each you won or lost (disregard all "push" results for this study).

If you get more losses than wins then you have a positive house edge, otherwise you have a negative house edge and you should immediately inspect your RNG to see if it has any flaws that are making such predictable numbers.

Mmm, the cards are picked randomly, any ideas of how demonstrate that the house does not have any edge?  

I want to increase the bankroll and the max bet but I'm a little bit afraid  

OK that's like putting a huge bullseye for hackers on your casino.


I would host this locally if it's even possible, because as I mentioned in a previous post, DNS hijacking is a real thing and can send back different validations or even hashes. Do not make a network request to that resource in production.

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@roynx98

I noticed you posted a 50 bits promo code here just now but removed it. I'm the one that used it (I think they're still one-time use?).

I wanted to see how your bankroll would withstand a few bets so I was gambling 10 bits at a time for most hands.

As I expected, I eventually lost all that bonus money after going as high as 110 bits at one point. So it at least makes me feel better that you have some kind of house edge.

I'm not too comfortable that you set the Blackjack payout to 30 bits. I know it's rare, and a streak of losing (as in theoretically impossible to win) hands swallowed all those bits - including a 50bits bet I placed towards the end of the run after a series of 10 bits, but consider the possibility of someone striking lucky and hits blackjack getting the triple payout and immediately withdrawing.

Given that 50bits is the max bet, a 150bits win can still punch a huge hole in your [now depleted] bankroll.

Than you  , Yes the gambling license it will be hard  

I'll answer your questions:

1) No, there is no way to verify it. It's just a bunch of random data. The id can be anything, even you can create you own, just modify the string and it will be another account.
    maybe i'll change it, I think all the ids can start from a seed so anybody can very them.
2) Interesting   it can be a good addition.
3) Hehe, it was just a mock, I can not guarantee the security of the site at this moment ,  I'm working alone in this project and just on my free time

Thank you for sharing the SHA256 tool  

The thing is that game does not allow you to make beats greater than 100 bits,
but it seems that someone modified the request to make it bigger, and our backend code had some error to validate it.

So we did not make any profit, those bet were fakes.

Yes, it was bad   , sorry, the problem was that the house money was empty due to the over bets,
so if you win it would be impossible to pay you but It's already fixed.

I want to increase the bankroll and the max bet, just I want to make sure that there are not vulnerabilities.

I like the concept of your casino, but the bad thing is you'll be hard or impossible to get a gambling license. This make people is hard to trust your sites since there're so many thing need to be answered in public.

1. How we can sure the user ID generated on your URL is safe? is there any way to verify it?
2. Can you add 2FA before user can log in with unique code generated/UID?
3. Your slogan Hack us you mean you're pretty sure your code is secured, but why you still faced a vulnerability in your casino?

Just for information you can use this sites https://www.toolsley.com/hash.html to validate the cards hash, just copy the deck cards and you will see an exact hash on SHA256 to validate.

If anything, the majority of those bits would be going to the bankroll, not his pocket - Only house edge profits (they are usually subtracted from the total bet whether it's a win or a loss) can be pocketed by the house.

So that would make to be several hundred bits at the highest.

Based on the bet history, most bets that are higher than 100 bits were lost bets. I did not check all pages of the bets history but I can see some 10,000 bits losing bets. Shouldn't you make some profit from those 10,000 bits losing bets? That's even 3x bigger than your bankroll. Coming up to the word "hacked", is it appropriate to accuse player hack your site while there is no rules on your site about the max bet? You allow the bets and there are losing bets too, how can it be called by hacked?

Perhaps put this project on hold for the moment?

Doesn't look the best on your brand if you put out an unfinished product that can't even be used properly.

Also, I'd highly suggest that you start with a higher bankroll - 100 bit max bet is a joke, this is the base bet for a lot of players.

Stedsm may be right that op is only testing the site or it could be the truth about the bankroll. Op doesn't have a choice but to look for investors but the problem is if op can attract investors or not. I think it may work if op will run a fundraising and have own token or coin for the site use.

welcome I'm glad with your honesty regarding the 3mbtc bankroll and happy also with the new gambling website but 3 mbtc bankroll will not be able to compete with other gambling websites ,the maximum bet is also very small ! I used to often see sites without registration that could directly play using a URL ID code like that not something new for me but hearing that 3 mbtc bankroll is a new thing for me ! how can gamblers trust and playing on your site with that bankroll

1 Bit = 100 Satoshis
So in this case, 100 Bits being the max bet was worth 10k Satoshis (BTC0.0001) bet and 3k Bits was his website's entire bankroll = 3,00,000 Satoshis (BTC0.003)
I was amazed to see how a person can promote his website without complete details about his bonus promo (didn't tell in OP that it was a one-time-use code) and then came the bankroll size which was a joke. He must have told us that he is "testing" his site's vulnerabilities and exploits before launching fully or who knows if he's got that 3k bits only in the website's bankroll! 

Checked your site out and loved the clean design of your site, but the performance definitely needs improvement. Certain sections took a lot of time to load despite the fact that my internet speed is around 300 Mbps.

Also, the help or FAQ section needs to answer additional queries such as minimum deposit, minimum withdrawal, house edge etc.

Liked the quick registration process which isn't exactly unique, but helpful nevertheless. Also, you should have done more research regarding max bets etc as some of the posters above mentioned op.

This is your periodic reminder to never launch with a max bet that is not small enough compared to your bankrolll.

Your max bet should be many, many times smaller than your bankroll.

E.g. Let's suppose I have a bankroll of $1000 (I know it's a terribly low amount, but this is what some people have to work with).

If I make the max bet $50, then people can bet 20 times (and win all of them to finish it up.

Alternatively, if I make the max bet $20, people have to bet 50 times simultaneously.

Now let's suppose you have some probably fair game with 49% chance of winning - obviously most games have even lower probabilities than this, further reducing the chances of bankroll depletion - so that there's 1% house edge. So for those $20 bets, you will win on average 24 of them and lose the other 26.

26*$20 = +$520 that goes back to the bankroll. 24*$20 results in -$480 taken away from it (this amount includes the 1% house edge the owners [you] take as profit). That means your bankroll increased by $40.

Also, .49²⁵ (this is 24+1, the minimum number of wins out of 50 necessary to report a net bankroll loss) is 0.00000001798465. In other words. 3.67e^-8 i.e eight zeros after the decimal, or a 0.0000001798% chance that people will win more than they lose and send your bankroll down a spiral.

To put that into perspective, this will only happen every 55,602,972 * 50 = 2,780,148,626 bets: almost 3 billion bets. By comparison, Primedice (the oldest gambling site) just reached their 100 billionth bet a few days ago - over an 8 year period.

The same amounts with $50 max bet result in 9 wins against 11 losses. With -$450 against +$550 = +$100 net increase of bankroll per 20 bets (assuming everyone bets the max bet).

But crucially, the probability of net losses in your bankroll at $50 max bets is much higher, at .49¹⁰ = 0.000797922662976 or a staggering 0.07979% chance of sinking bankroll.

And even more shockingly, this event will happen every 1,253*20 = 25,065 bets!

If your site had 1 bet being placed per minute (because it's small) then you would start noticing losses after just 17.4 days. If it was 1 bet per second like some larger sites, it wouldn't even last half of the day without a net loss.

That's why it's so important to crunch the numbers before you start because if you make your max wager too high, it won't sustain your bankroll! Even a slight decrease in max bet will lower the probability of bankroll net losses!

Almost all games have a less than 50% chance win rate or else their bankroll would keep sliding into a net loss. And the games that do have >50% chance options have less than x2 odds so it works out.

Just some bankroll management 101 for casino owners

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I also recommend that for brand new casinos, that you manually approve ALL withdrawals exiting your site. That way you have the chance to see if anyone is abusing some exploits before they can make off with your bankroll. Of course, you can gradually automate smaller withdrawals (up to a certain amount) as your systems become more and more secure.

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Why don't you just disable the betting buttons in your case though, so you don't have to be on other people's mercy not to play (and use the exploit against you)?


How much is a bit?  

Welcome to bitcointalk forum. It seems this will be your ann thread right?. I was hoping you could answer about the thread title you used. Why is it please do not play for the moment?. Why launched it if you won't let people play or check the site yet. I think it's better if you launch it when it is complete or done developing the site.

A joke gives a promo code but everyone is asking why the code can't be used? is this a limit? if yes then who has used them all. Or indeed the code is no longer valid. I tried to update the network because I thought the problem was with the internet network, but after that everyone said the same problem means the error is in the promo code.

I don't really care, maybe I still have questions about registering without having to register to enter a user name, just need to bookmark the url. Quite unique but, also quite vulnerable to loss.

Are you freakin' kidding us?
You should have mentioned that it's a one-time-only usable code and can be redeemed by one person only. However, after knowing your bankroll, I now know the reputation of your website and I'd suggest you to prepare it with a much bigger bankroll before you start to promote it as 3000 bits and a max bet of 100 bits is nothing and a gambler can win that much in a single bet if you increase the max bet to 3k bits itself.

Yes it's a code for a single person, The bankroll was around 3000 bits, I've lost most of it  , there is a vulnerability, the max bet is just 100 bits, but the people hacked it to bet more.
The account can be a nice addition maybe the two options can live together. thanks for you feedback  

Sorry that code was already used and It can be only used once, I'll share new a ones as son a I fix some vulnerabilities, a few hours back somebody did bets that were too big. The house has lost all its money  

It's the first time I've found a casino without registering, what I'm afraid of is what if the balance inside which has a large enough portfolio in and out of the casino and of course the way to access it is by entering each code? isn't that too dangerous for the user. The simple registration process at a minimum includes registration using an email and password. In any casino it becomes the minimum standard of registration that must be done. In order to distinguish one user from another. One more thing the promo code is not valid, almost 20 times I repeatedly the code is still invalid.

I understand that you get confused because it is your first time to see gambling with no registration needed.
It was something popular in the past and there are some on-chain gambling site like this where you can play without an account (registration).
For me, it is not that confusing as I have experiences in some on chain gambling site in the past such as luckybit, directbet, and bitcoinvideocasino.
The last one I mentioned might be the most similar one with this new site, because you need to save your private url before making deposit or when you want to play once you have made the deposit.
What makes this site is a bit different with the other on chain gambling site is the design, this one is so plain and may make new users with no experiences in similar type of gambling get confused.

It looks empty and not moving because you do not have money in your account to play.
The same you may see in most blackjack game, you will see nothing except the blackjack board/table and you'll see the cards once you place a bet.
Regarding reputation, it is still new site (at least in this forum) so no one will be able to confirm unless there is someone who have tried it by making deposit and withdraw.

I saw the Bitjack gambling site as stated by the OP, although it was suspicious, but I can't be sure if the Bitjack site is a scam or not, what is clear is that all of this is confusing.

When I visited the Bitjack site, what I got was as below.



Everything is empty, I don't know where else to go, the site stands like a trance, without moving, I hope someone can confirm the Bitjack site about its reputation here.

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ha, ha, uh, uh, I thought someone would answer like that, no deposit the table doesn't move, like a trance, right.

How about you, do you want to make a deposit to the Bitjack site, without complete security, such as registration, email, password, verification etc.
Honestly, i had to think twice, to do it, oh, yes, thanks for answering.

So the code doesn't work at all and I believe that either it was for limited accounts or was it for a single person and you'll be giving us more promo codes each in order to try out the website? BTW, what's the bankroll of the website if you don't mind sharing it? And I'm totally fine with creating an account at your website because we don't have those satoshidice kinda websites anymore where we need to store our URL to play ahead. I fear of losing the URL as well as my funds too, so please make signing up available on your website.

@michellee you’re right the promo code no longer works, and I’m not sure if users will like playing without being registered, because keeping hold of the link maybe difficult hence there should be a registration page, and a stats page. Also i feel that people should not wager big amounts till the op earns some good trust here, because it’s a new site and depositing big amounts in a new site is always risky.

I was visiting your website and tried to apply the code but it seems the code is not valid so I did not expect success.



It is my first time to see a gambling site like your website because we do not have to register and only need to save the URL. It is so simple and does not take long to start playing. I can not try playing the game since I can not use the code so I think I will wait for the next code that you will share

Win Bitcoins playing online Blackjack https://playbitjack.com/

Now I'm releasing the beta, I posted the full game but It was not ready, my apologies   
In the beta version you can not deposit any money and the max bet is 10 bits, the only way to get funds is with the promo codes
so if you want to try the game, ask me for a promo code on my

Twitter: https://twitter.com/Mitosys3
or
Email: [email protected]

You will be able to withdraw your money immediately

Key Features
* No registration
When you click 'New game', you can play immediately, you will be redirected to a play URL,
that URL is like your password so please save it in a safe place,
whatever person with that URL could play with your money.

* Promo codes
Bitjack supports promo codes, when they are used you will receive free Bitcoins to your account immediately.
You can withdraw the money any time