EthereumLottery.net [GAMBLE]

[huntalan81]

Yes! Finally a good work, good site! I will take into some ETH!

[densuj]

Hi all!

I have sucesfully started my site: http://ethereumlottery.net.
I hope you like it. In case of failure write here in the topic.

BR:
-iFA

I have opened your website via android everything is ok, but there are not FAQ on there and it is make me confuse. I hope you can add it or you add something are like tutorial on the website or in here. Thanks

[sydhelly]

Hey there.

I think there is a problem with loterry D.
I like the concept but I check my chance of winning and it's ridicilously low !!!!

If I place a 5 ETH bet, I can win *10 but only have a chance of winning of 1/26000000 !!!!!
ONE OVER 26 MILLIONS ??
that's crazy, no one in his right mind will play this game !!

We win if :
bigNumber * difficultyMultipler % difficulty_ == 0

but with the max bet of 5 ETH, difficulty is equal to 26 000 000.
So 1 chance / 26000000 that the remainder of the division will be 0.
Insanely low for a *10 gain !!!

Scam ?  

[huntalan81]

Hey there.

I think there is a problem with loterry D.
I like the concept but I check my chance of winning and it's ridicilously low !!!!

If I place a 5 ETH bet, I can win *10 but only have a chance of winning of 1/26000000 !!!!!
ONE OVER 26 MILLIONS ??
that's crazy, no one in his right mind will play this game !!

We win if :
bigNumber * difficultyMultipler % difficulty_ == 0

but with the max bet of 5 ETH, difficulty is equal to 26 000 000.
So 1 chance / 26000000 that the remainder of the division will be 0.
Insanely low for a *10 gain !!!

Scam ?  

No, you calculaded badly. Chance 1/26 - not 1/26000000.

[sydhelly]

No I did not make a mistake.

Check in mist :
enter 5e18 in bet
you get 26000000

And it's not a rate.
It's the value of diffculty in the equation.

bigNumber * difficultyMultipler % difficulty_ == 0


So the hash number * 1000 (diff multipler) has to be a multiple of 260000000 for you to win.
1 chance over 260 000.

I know solidity. I did not make a mistake.

This game is a scam.

[iFA88]

Dear densuj,

I dont have FAQ yet, but i would write one
The website is created for desktop use at most.

Best regards:
-iFA

Hi all!

I have sucesfully started my site: http://ethereumlottery.net.
I hope you like it. In case of failure write here in the topic.

BR:
-iFA

I have opened your website via android everything is ok, but there are not FAQ on there and it is make me confuse. I hope you can add it or you add something are like tutorial on the website or in here. Thanks

[huntalan81]

No I did not make a mistake.

Check in mist :
enter 5e18 in bet
you get 26000000

And it's not a rate.
It's the value of diffculty in the equation.

bigNumber * difficultyMultipler % difficulty_ == 0


So the hash number * 1000 (diff multipler) has to be a multiple of 260000000 for you to win.
1 chance over 260 000.

I know solidity. I did not make a mistake.

This game is a scam.

"a multiple of 260000000" / 1 000 000 - this step is missing in your calculation


But contact the developer - he told me this.

[iFA88]

Dear sydhelly,

Thank you for your respond.

I have disabled the contract until i check this!
I don't want to create a scam contract.

Best regards:
-iFA

No I did not make a mistake.

Check in mist :
enter 5e18 in bet
you get 26000000

And it's not a rate.
It's the value of diffculty in the equation.

bigNumber * difficultyMultipler % difficulty_ == 0


So the hash number * 1000 (diff multipler) has to be a multiple of 260000000 for you to win.
1 chance over 26 millions.

I know solidity. I did not make a mistake.

This game is a scam.

[sydhelly]

Ok good to know,

Thanks a lot for the feedback Ifa

[sydhelly]

"a multiple of 260000000" / 1 000 000 - this step is missing in your calculation


But contact the developer - he told me this.

The solidity code is all I trust, it never lies.
And in the code, it is not divided by 1million.

[iFA88]

Dear sydhelly,

You have confused me

I have checked the source code and i think it stills fine.
I try prove my right:

I think you have not checked this: (this is in the makeRoll function)

Code:

if (bigNumber * difficultyMultipler % difficulty_ == 0) {

Thats mean when i multiple the A number what i module with the B number i got the same result.
Examples:

#1 (with lose)
bigNumber = 16171794848463
difficultyMultipler = 1000000
difficulty_ = 26000000
bigNumber * difficultyMultipler % difficulty_ = 7000000

#2 (with lose)
bigNumber = 16171794848463
difficultyMultipler = 100000
difficulty_ = 2600000
bigNumber * difficultyMultipler % difficulty_ = 700000

#3 (with lose)
bigNumber = 16171794848463
difficultyMultipler = 1
difficulty_ = 26
bigNumber * difficultyMultipler % difficulty_ = 7

#4 (with win)
bigNumber = 118268331246
difficultyMultipler = 1000000
difficulty_ = 26000000
bigNumber * difficultyMultipler % difficulty_ = 0

#5 (with win)
bigNumber = 118268331246
difficultyMultipler = 100000
difficulty_ = 2600000
bigNumber * difficultyMultipler % difficulty_ = 0

#6 (with win)
bigNumber = 118268331246
difficultyMultipler = 1
difficulty_ = 26
bigNumber * difficultyMultipler % difficulty_ = 0

I wait for you respone. I dont create new contract until we dont have cleared the situation.

Best regards:
-iFA

[sydhelly]

Thanks for the clarification IFA,

I think it's clearer now, but I'm not sure it's solved.

So If I understand you, you say that

big Number * 1 million % 26 * 1 million

is the same as

big Number % 26 ?

I'm not sure the probabilities are preserved.
In this case yes because we can factor 1million in each side.

But take for instance a bet of 1.1 ether, difficulty of 118181817.

so now it would be
big Number * 1 million % 118181817

your proof does not work for this case, you can't divide anymore without altering the result.

[iFA88]

Your welcome!

Yes correct!

So i create the contract again

Thanks for the clarification IFA,

Hmm I think it's clearer now.

so it's like this :

big Number * 1 million % 26 * 1 million ?

so it's like big Number % 26 ?

[sydhelly]

I have edited my message,
I think it is not correct in fact !

[sydhelly]

But take for instance a bet of 1.1 ether, difficulty of 118181817.

so now it would be
big Number * 1 million % 118181817

your proof does not work for this case, you can't divide anymore without altering the result.

so suppose you have

bigNumber % 118 =0

you don't have big Number * 1 million % 118181817

[iFA88]

I have a lot times tested today.

If the Difficulty is 26'000'000 you have 1:26 rate for win.
When you play with 1.1 ether, then the Difficulty is 118'181'817. Thats mean you have 1:118.181817 to win.

This is simple Math

But take for instance a bet of 1.1 ether, difficulty of 118181817.

so now it would be
big Number * 1 million % 118181817

your proof does not work for this case, you can't divide anymore without altering the result.

so suppose you have

bigNumber % 118 =0

you don't have big Number * 1 million % 118181817

[sydhelly]

When you play with 1.1 ether, then the Difficulty is 118'181'817. Thats mean you have 1:118.181817 to win.

This is simple Math

no it's false. You assume you can divide both sides of the modulo and preserve the chances, it does not work like that.

the bignumber*1million should be a multiple of 118'181'817 for your contract to trigger the transaction.
that's 1 chance over 118'181'817

it's not the same as bigNumber divisable by 118 which is a chance over 118.

Btw you should know that there are no float (real) numbers in solidity so your 118.18 makes no sense.

[iFA88]

This is the reason that we need to work with big numbers.

Please check this my Friend: http://pastebin.com/fhF3i6y0
If you see, when you increase the number then the result will be 0 on every 26 time. This mean: 1:26 for get the result: 0 !

I have now whats wrong! When the Difficulty changes under 1 million then the success rate is absolute high.
Example when you want play with 1.1 ether and you get 118181817 Diffi, then you have 1 : 59 090 908 rate. This means the calculation is wrong.
I disable the contract until i can fix this problem.

Very thankful for your report!

I will reply when i'm done with the contract.

Best regards:
-iFA

no it's false. You assume you can divide both sides of the modulo and preserve the chances, it does not work like that.

the bignumber*1million should be a multiple of 118'181'817 for your contract to trigger the transaction.
that's 1 chance over 118'181'817

it's not the same as bigNumber divisable by 118 which is a chance over 118.

Btw you should know that there are no float (real) numbers in solidity so your 118.18 makes no sense.

[iFA88]

News!

Type D contract is ready to use!

This is a unique gamble game wo you can be Player and Investor in the same time!

Document:
https://ethereumlottery.net/doc/dEthereumlotteryNet.html

Contract:
https://live.ether.camp/account/0xe0CFa488bB6442D39a4aBf844D5876F209f03871
https://etherscan.io/address/0xe0CFa488bB6442D39a4aBf844D5876F209f03871#code

Website:
http://d.ethereumlottery.net
(Play from the website is still under development.)

Yesterday have increased the faucet claim reward from 10-25 szabo to 10-50 szabo.
50% ref and 10 minute claim delay is still available.
http://faucet.ethereumlottery.net

[sydhelly]

GJob for the update.
I will read the code when I have time and let you know what I think.