Topic: I ran a test on BTCFlip.com - page 2. (Read 4002 times)

So, where are your detailed results for this like you used in your first post?

+1

what evidence do you want? the OP basically said that larger bets lose more often then win. 80-90% lose.

sites like the one being discussed just scream to me it is a scam. it is par for the course around here.
flip a coin with a bitcoin website and 50-50 that you will get screwed.

Can anyone back this up?

God damn, all these scam sites are bumming me out.  :/

That's a pretty big accusation for providing zero evidence.

okay, I got a few reports that they do in fact possibly alter the odds for much larger bets.  So I ran a very expensive experiment and found that yeah, they use horribly unfair odds at higher amounts.  After a high enough volume to accurately measure it, it's around 80-90% they win at amounts above 0.5 BTC.  So don't bother with these assholes.

they were most likely mine

Jeeez 50 times... I had that in my sig for a while and even I never played it that much.

Got a few '1% referral' payments though even though they work out to be quite small mostly.

a couple hundred sets of 50 flips should begin to prove this better

Where on Shackleford's site does it say he ran these kinds of tests?  I don't think 1000 trials is going to provide any evidence about -- well, anything -- remotely useful for a coin flip.  That's just too little data.

26 losses and 24 wins 

EDIT: you might want to read one of my later replies first...

Whenever anyone wants to know if a gambling site is rigging the game, they run a sort of brute force test.  That's when they play a ton of hands to see if it's either letting them win for the first couple hands or making them lose more than the odds of the game suggest.  The Wizard of Ods is famous for doing that and found some semi-high profile gambling sites were rigging it so people won with their free initial buy in credits more than they should and then lowering the odds after that to below normal game levels.  He usually plays 1000 hands but I'm not that patient so I tested BTCFlip with 50 bets  

The results were *drum roll*...

26 losses and 24 wins.  They pay a 1% bet commission on referrals and obviously keep a bit of a advantage to themselves but these numbers indicate that it's not like a 20% advantage or something.  That suggests a 2% advantage but don't think that number is set in stone because 50 is not a big enough test to dial it in precisely.  The results were:

loss
win
loss
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win
win
win
loss
win
win
loss
win
loss
loss
win
loss
win
loss
loss
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win
loss
win
win
loss
loss
win
loss
loss
win
win
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win
win
win
win
loss
loss
win
loss
loss
win
win
loss
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win
win


so it seems that there are no conditions under which it gives an advantage or disadvantage.  They certainly weren't letting me win right at the start lol.  Just for fun, I ran a few bets that were much, much larger than their 0.01 minimum and lost 3 and won 2 which doesn't say much other there's not a 100% "they win" clause in their randomization code for high BTC amounts can't really comment on whether or not they up the odds at all in that case though.

By the way, I actually played 51 rounds and it dropped one of my bets.  It timed out and they said they never got it but I checked and the correct amount was sent to the correct address.  I was running all of these in firefox but I opened IE because of the view source feature to see if there were any hints or exposed code on the page and that's the one that got dropped so maybe it's not IE9 friendly or something.  It is all javascript based so who knows.

So my overall result is with no account or other apparent way of tracking a deposited bet, if anything happens to the page or their server mid-game, you're screwed, making it pretty unsafe.  Also, they don't list any information on the odds or have any guarantee that they don't change so that's pretty sketchy.  Why would anyone (other than me ) play a game that doesn't list the odds of winning?  Other than that, from an odds point of view, it's at least somewhat close to 50-50 and appears to have no larger of an advantage than any casino game so if you want to go for it, go for it

EDIT: oh yeah, I should probably mention that I won 24 times and there are 24 payouts from them in my bitcoin client log so they also do pay you if you win  That seems to be an important part of any gambling site review lol.