A smart guy fools a gambling site (which accepts unconfirmed deposits but allows withdraws only after all deposits are confirmed) by depositing bitcoin in low priority transactions (unconfirmed inputs, no fees). When he doubles his wage he waits a day until his low priority deposit is finaly confirmed and cashes out. When he loses his wage he somehow achieves that his deposit do not confirm at all and just creates a new account.

What I don't understand is why one tx gets confirmed and the other one does not. Does not look like a double spend to me but maybe I'm misinterpret blockchain data.

Here are two example transactions:

Confirmed tx (and I have no idea why this one went trough but the other did not):
https://blockchain.info/tx/3c2ac5ce691d99770c654f4fa2a69b1825e93158fedc3436de07f18bb6f91bf4

Unconfirmed tx (and I'm pretty sure it won't confirm):
https://blockchain.info/tx/1f006d66ea95ce46cafe4be66c149d7299fd35d4aa7287e5db4f435dce66eda1

Some numbers from https://satoshi-karoshi.com (last 6 month) where both is possible:

3476 anonymous accounts
2786 regular accounts (1387 of them even entered their email address)

Myself I allways prefer anonymity and I rarely sign up to gambling sites which require email + captcha instead of shutting up and taking my money 

About losing your account: as xinzark already said there is the possibility to prove ownership by proving ownership of the sender address on deposits. We had some cases and allways sent remaining funds back to the origin address.

Simple... don't keep more money in your smartphones bitcoin wallet than you keep fiat in your real life wallet.

satoshi-karoshi hits 700,000 bets 

i've set up a realtime stats page for you:
https://www.satoshi-karoshi.com/?a=Index.stats

definition of luck...

It's about advertising. Publishers/Webmasters who own a website can rent out their banner ad space and Marketers who own a business can rent these spaces to put their advertizing there. A-ads is a marketer for banner ad space and brings these people together and handles technical stuff and clearance.

"coke en stock" damn. i knew it yesterday but didn't bet as the text didn't make any sense to me. "coke en stock"... does it have a meaning?

love this game

conspiracy: their verification system doesn't proof that lucky numbers are uniformly distributed. maybe it's a trap to make people bet on 91%?

nice try, allmost got me

didn't get a mail, too. why do you need mail verification btw?

Cool idea, here we go

I've modified the game a bit:
- you can bet lo, hi + between
- you don't get 2x but the multiplier is calculated for each bet instead (up to about 12x)
- provable fair

https://www.satoshi-karoshi.com/?a=Inbetween.index

Just-dice and doog have a excellent reputation and personally I would say pretty safe. But things happen, think about gox or inputs.io... you should never leave more money than you can afford to lose on any site.

https://www.satoshi-karoshi.com - 697,962

http://www.litecoin-karoshi.com - 13,809

Yeah, still alive for over a year now

- The highest valued chip is currently 10 mBTC = 0.01 BTC - you would have needed to accidently place at least 20 bets to lose 0.2 BTC
- There are no buttons on the page.
- It's drag 'n drop. You can click safely anywhere a million times without placing a bet
- You went to log out without withdrawing your funds? Yeah. Sure.
- Nobody lost 0.2 BTC in satoshi-karoshi roulette the last couple of days.

So what the hell are you talking about?

Nevertheless, thanks for bumping the topic.

1 @ 0.5

Sure thing. I really hope it becomes more popular 

Number generation is provable fair, here are more details: https://www.satoshi-karoshi.com/?a=Roulette.list

Hot wallet: a bitcoind 0.8.6 @localhost holding an amout which would hurt but would not kill me if hacked.
Cold wallet: paper wallets (using blockchain.info android app to scan private keys)

There is allways a server which needs access to the hot wallet and when this server is compromised it does not matter which wallet you use - the attacker can access it the same way... Running a bitcoind yourself reduces the possibility of a man-in-the-middle attack and makes you independent of a third party (MtGox also had a secure API btw.).
If you have skills + resources I'd say it's allways best to run a own client.

Blockchain.info - Think they are really convenient + trustworth and I used the API some time last year (then decided to run bitcoind as I love the fact to handle it completely on my own and am not incapable of action on any downtimes). Beware: in contrast to their online wallet where decryption takes place on your client side, when you use the API then you send your decryption password (in plaintext... okay it's a secure SSL connection but anyways...) and decryption takes place on their server.

Yeah. Amazing how fast such a feature is abused by some people 

Nevertheless enabled it again with 0.01 mBTC


@Nobitcoin: more details please?

I only see successful a transaction a month ago on 2014-02-11 16:23:22. Could you provide me some more details (txid, address, amount)?