Play Hi/Lo Card game. Win Bitcoins (our first BitCoin App)

WikileaksDude

hero member

Activity: 490

Merit: 500

Quote from: dooglus on March 06, 2013, 01:31:04 AM

Quote from: BitCoinWarrior on March 04, 2013, 10:43:03 AM

We'd love to know what you think.

I notice you don't use a regular deck of 52 cards and shuffle them. You use a 50 random numbers between 1 and 13. That can mean there are lots of aces and no 2's, for instance. You seem to have complete control of the seed used to pick the cards, and the txid is only used to shuffle it. So you can deliberately pick seeds which result in a skewed deck (lots of very high or very low cards) to throw the player off.

It would be better if you either used a full deck of 52 cards, or used the txid to adjust the seed for card selection as well as for card shuffling, if you want the game to be provably fair.

This is why I love btc community.

We ain't stupid ya kno'?

Looking to play soon Tongue

montana

newbie

Activity: 46

Merit: 0

Quote from: BitCoinWarrior on March 04, 2013, 10:43:03 AM

We're a couple of guys trying to get our heads around Bitcoin from a economic and technical perspective.
We put together a simple site where you can play Hi/Lo Card game and win bitcoins.

We'd love to know what you think of our implementation and how we're used Bitcoin transaction ID's to prove the games are fair and authenticated.

The site is: http://bitino.com

We'd love to know what you think.

doesn't seem to be available on either Opera or Firefox ;-/

Lajci

newbie

Activity: 25

Merit: 0

good job

dooglus

legendary

Activity: 2940

Merit: 1330

Typos: "as a encrypted hash" *an* encrypted.

"We create a sever 'seed'" -> server

"algorthims" - spell check!

"pythons implementation" -> Python's

"and withdraw you Bitcoins" -> your

dooglus

legendary

Activity: 2940

Merit: 1330

Quote from: BitCoinWarrior on March 04, 2013, 10:43:03 AM

We'd love to know what you think.

I notice you don't use a regular deck of 52 cards and shuffle them. You use a 50 random numbers between 1 and 13. That can mean there are lots of aces and no 2's, for instance. You seem to have complete control of the seed used to pick the cards, and the txid is only used to shuffle it. So you can deliberately pick seeds which result in a skewed deck (lots of very high or very low cards) to throw the player off.

It would be better if you either used a full deck of 52 cards, or used the txid to adjust the seed for card selection as well as for card shuffling, if you want the game to be provably fair.

BitCoinWarrior

newbie

Activity: 37

Merit: 0

hey, thanks for the feedback

titus

newbie

Activity: 29

Merit: 0

Just wanted to say that I used this the other day after the post on hacker news. Worked out well, got paid out without any problems. Looking forward to seeing more games!

BitCoinWarrior

newbie

Activity: 37

Merit: 0

We're a couple of guys trying to get our heads around Bitcoin from a economic and technical perspective.
We put together a simple site where you can play Hi/Lo Card game and win bitcoins.

We'd love to know what you think of our implementation and how we're used Bitcoin transaction ID's to prove the games are fair and authenticated.

The site is: http://bitino.com

We'd love to know what you think.

Topic: Play Hi/Lo Card game. Win Bitcoins (our first BitCoin App) (Read 1774 times)