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Author Topic: Introducing Cryptour - Fun Bitcoin Tournament | No signups req | Provably fair  (Read 5001 times)
PlayCryptour
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September 19, 2015, 08:00:00 PM
 #1

Fresh off the oven. Just hit the Live button only a couple of minutes ago.

Introducing Cryptour.
https://cryptour.com

Cryptour is an exciting cryptocurrency tournament that is provably fair.

Each tournament functions similar to a poker tournament, except without the cards and a much larger scale.

There is no registration needed to play. No Random Number Generator (RNG)!. 100% provably fair.

We are only just launched with 6 tournaments announced so far, 3 with guarantees!



We have only just concluded our first pilot tournament, with 10 winners and overlay.

Next upcoming tournaments:

Notes:
  • Entries are updated in real time, even before confirmations.
  • The site currently has no live refresh, please refresh to view the latest entries.

Sign up for our updates at the bottom of the site to get posted as we updates. We will be adding freerolls soon for newsletter subscribers.

Feel free to ask me here if you have any questions.
Suggestions and feedback are very welcomed!

Good luck!

Cryptour - Live Bitcoin Tournaments
No sign ups | Provably Fair | Live actions | Intro tourneys with Overlay
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September 19, 2015, 08:25:30 PM
 #2

Do you do not have free tournament ?
We need free tournament to try your web.
Thanks in advance

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rz20
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September 19, 2015, 08:27:32 PM
 #3

I've  signed up for a free tournament, I hope they come soon.

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scriptman
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September 19, 2015, 09:39:36 PM
 #4

This looks interesting!

Can people who've played please post a review?

Thanks

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PlayCryptour
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September 20, 2015, 01:22:11 AM
 #5

Do you do not have free tournament ?
We need free tournament to try your web.
Thanks in advance

Thanks!

We will be launching freeroll support within this week! Mailing list subscribers will definitely get the first codes.



Cryptour - Live Bitcoin Tournaments
No sign ups | Provably Fair | Live actions | Intro tourneys with Overlay
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September 20, 2015, 01:36:59 AM
 #6

Do you do not have free tournament ?
We need free tournament to try your web.
Thanks in advance

Thanks!

We will be launching freeroll support within this week! Mailing list subscribers will definitely get the first codes.




Subscribed to the list. Free coupon is the best way to try the site risk-free.
Provably fair method used is well explained. There is no minimum number of entries for guaranteed tournament to be held?

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September 20, 2015, 01:50:33 AM
 #7

This looks interesting!

Can people who've played please post a review?

Thanks

The tournaments are the first ones we have. We have just went live couple of minutes before the start of this thread. Hope reviews will come soon.

Our Pilot tourney is closing soon when Bitcoin block height hits 375 480 (ETA:1 day), has a massive overlay:

BTC 0.003 to enter
with BTC 0.15 guaranteed prize pool

Hope to see some entries soon!


Cryptour - Live Bitcoin Tournaments
No sign ups | Provably Fair | Live actions | Intro tourneys with Overlay
rz20
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September 20, 2015, 02:06:48 AM
 #8

Looking at the probably fair system, I have one doubt, what prevents you from generating an exact txid to win the prize when many people bets? Because you can actually see the salt (it is in your server). Provably fair means that a casino can't take the win from the player or modify it, but here you can find a txid that merged with the salt gives you the victory. I don't know how could you find a way to fix this...

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PlayCryptour
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September 20, 2015, 04:23:25 AM
 #9

Looking at the probably fair system, I have one doubt, what prevents you from generating an exact txid to win the prize when many people bets? Because you can actually see the salt (it is in your server). Provably fair means that a casino can't take the win from the player or modify it, but here you can find a txid that merged with the salt gives you the victory. I don't know how could you find a way to fix this...

Thank you for reviewing our provably fair algorithm. Yes, our goal is to have a system that not even the house can exploit.

The txid that we are using is txid from bitcoin blockchain itself. We even link directly to blockchain.info so it is not up to us to generate txid. In fact it is generated at players' wallets.

Salt for each tournaments are predetermined even before we get our first entries. While our gut feeling tells that we can publish salt even before tournament concludes, just to be extra safe, we decides to instead publish sha256 hash of salt from start of tournament. When tournament concludes, actual salt will be revealed and that can be validated with the sha256 hash that has been published.

As far as I can tell, I do not think we are able to exploit it even knowing the salt.

Or perhaps, we should make it fair and just publish the salt right away as I don't think it is exploitable, right?

Thanks once again for reviewing it. We would like to create a safe and trustworthy tournament environment for all. Eventually our goal is to allow even 3rd parties to organize tournaments on our platform.

Cryptour - Live Bitcoin Tournaments
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September 20, 2015, 04:36:13 AM
 #10

I'm confused... so is this a tournament based on hash rates? I have no idea how this "tournament" works, so explain it for a newbie please  Grin
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September 20, 2015, 04:41:26 AM
 #11

Quote
Provably fair method used is well explained.

Thanks for reviewing it! That's the idea. Smiley

Quote
There is no minimum number of entries for guaranteed tournament to be held?

Minimum number of entries would be 1. Otherwise we have no one to pay to.  Cheesy

Quote
Subscribed to the list. Free coupon is the best way to try the site risk-free.

Thanks for the feedback! Yes, we are working on it right now.

It was not very straight-forward as we have no accounts, so we will have to have a way to still allow free coupon entries to not only specify winning payout address, but also a way to generate txid without actual payment. I believe we have something figured out now and are in the works!

Thanks!

Cryptour - Live Bitcoin Tournaments
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September 20, 2015, 04:45:33 AM
 #12

I am interested in Tournament , will be playing it when it starts.
How the entries will be made ? I hope you gonna provide server seed so that we can check if the game is probably fair or not.
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September 20, 2015, 04:46:04 AM
 #13

Looking at the probably fair system, I have one doubt, what prevents you from generating an exact txid to win the prize when many people bets? Because you can actually see the salt (it is in your server). Provably fair means that a casino can't take the win from the player or modify it, but here you can find a txid that merged with the salt gives you the victory. I don't know how could you find a way to fix this...

Thank you for reviewing our provably fair algorithm. Yes, our goal is to have a system that not even the house can exploit.

The txid that we are using is txid from bitcoin blockchain itself. We even link directly to blockchain.info so it is not up to us to generate txid. In fact it is generated at players' wallets.

Salt for each tournaments are predetermined even before we get our first entries. While our gut feeling tells that we can publish salt even before tournament concludes, just to be extra safe, we decides to instead publish sha256 hash of salt from start of tournament. When tournament concludes, actual salt will be revealed and that can be validated with the sha256 hash that has been published.

As far as I can tell, I do not think we are able to exploit it even knowing the salt.

Or perhaps, we should make it fair and just publish the salt right away as I don't think it is exploitable, right?

Thanks once again for reviewing it. We would like to create a safe and trustworthy tournament environment for all. Eventually our goal is to allow even 3rd parties to organize tournaments on our platform.


hmm, you are missing this:
It is possible to know the txid before broadcasting it. So, the player can if he knows the salt generate a txid that makes him win the tournament.

The question is, since you have the salt, what is the guarantee that you will not exploit it?
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September 20, 2015, 04:50:54 AM
 #14

I'm confused... so is this a tournament based on hash rates? I have no idea how this "tournament" works, so explain it for a newbie please  Grin

No, it is not based on hash rates, though that would be an interesting concept!

Cryptour functions just like traditional multi-table poker tournaments, except without cards.
Score is generated for each entries based on txid and tournament salt.

Please check out the section on How Cryptour tournament works for more details.

You may wish to try out the first Pilot tournament for only 0.003 BTC. Tournament concluding sometime in a day or so.

Cryptour - Live Bitcoin Tournaments
No sign ups | Provably Fair | Live actions | Intro tourneys with Overlay
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September 20, 2015, 04:54:51 AM
 #15

You can pick the hash or nonce etc. of the block that concludes the particular tournament (Block 375,480 in the 0.15 tournament) as the salt.

That way, no one would know what the salt is. Smiley
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September 20, 2015, 04:59:02 AM
 #16

I am interested in Tournament , will be playing it when it starts.
How the entries will be made ? I hope you gonna provide server seed so that we can check if the game is probably fair or not.

The tournament ends when the Closing Block is reached. For our Pilot tournament, it ends when block height is 375 480.

The entries are made by simply making a transaction to the tournament address and for the amount of the entry fee.

Score is generated based on the entry's txid and tournament salt. More info on our provably fair algorithm.

Cryptour - Live Bitcoin Tournaments
No sign ups | Provably Fair | Live actions | Intro tourneys with Overlay
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September 20, 2015, 05:05:28 AM
 #17

You can pick the hash or nonce etc. of the block that concludes the particular tournament (Block 375,480 in the 0.15 tournament) as the salt.

That way, no one would know what the salt is. Smiley

That actually sounds like a great idea!

I am also having this thought, of publishing the salt right away and also the position and position (maybe score – but if an entry that scores too high may discourage further participation).

I believe SHA-256 should be safe enough that it is not exploitable, even knowing the salt before hand it is not easy to generate a winning txid. SHA-256 is picked in many places for Bitcoin protocol for precisely this reason.


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September 20, 2015, 05:23:26 AM
 #18

You can pick the hash or nonce etc. of the block that concludes the particular tournament (Block 375,480 in the 0.15 tournament) as the salt.

That way, no one would know what the salt is. Smiley

That actually sounds like a great idea!

I am also having this thought, of publishing the salt right away and also the position and position (maybe score – but if an entry that scores too high may discourage further participation).

I believe SHA-256 should be safe enough that it is not exploitable, even knowing the salt before hand it is not easy to generate a winning txid. SHA-256 is picked in many places for Bitcoin protocol for precisely this reason.


Nah, publish the salt and people can exploit it. Right now, only you can (I don't think you were aware of it, or you will, but anyway). But if you can make it related to something of the block that will only be known in the future, then it becomes 100% provably fair. Smiley

SHA-256 is safe. (as long as you don't use an online tool that doesn't store it in their DB. Xorbin is fine, I think)

Knowing SHA-256 before is fine. But knowing the salt isn't.
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September 20, 2015, 05:26:37 AM
 #19

I'm confused... so is this a tournament based on hash rates? I have no idea how this "tournament" works, so explain it for a newbie please  Grin

No, it is not based on hash rates, though that would be an interesting concept!

Cryptour functions just like traditional multi-table poker tournaments, except without cards.
Score is generated for each entries based on txid and tournament salt.

Please check out the section on How Cryptour tournament works for more details.

You may wish to try out the first Pilot tournament for only 0.003 BTC. Tournament concluding sometime in a day or so.

Ok, I might sound really newbish here because everyone is saying these terms interchangeably and I have no idea what they mean... what is "txid" and "salt"?
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September 20, 2015, 05:34:29 AM
 #20

SHA-256 is safe. (as long as you don't use an online tool that doesn't store it in their DB. Xorbin is fine, I think)

Knowing SHA-256 before is fine. But knowing the salt isn't.

Feedback noted, sir!

Working with the dev to switch it to nonce of closing block as we speak!

Appreciate your review ndnhc!

Cryptour - Live Bitcoin Tournaments
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