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Secret Keys

In order to ensure that there is no way for the system to change the outcome of a bet, the secret keys used are decided ahead of time. They are not released right away, since they could be used to submit selective transactions and win bets unfairly. However, the hash of the secrets is released. After the secrets are release users can verify that preceeding bets were provably fair.
Days

Each bet transaction that comes in is assigned to the secret key of the current day when it is first processed. In most cases this will be as soon as the transaction is broadcast on the bitcoin network. However it could be later if the system has some problems processing or an outage. All times are in GMT. Hash File
The system has a file of all the hash keys for the next 10 years: hash.keys This file can be verified in several ways. The simplest is to simply download and keep a copy of that file. If ever your copy and the copy we are distributing disagree there is something awry. The other way is to use a package called BitcoinTimestamp. This is something which stores a sha256 sum in the bitcoin network as a transaction. Since this transaction goes into the block chain, it is impossible for anyone to tamper with after the fact.


$ sha256sum hash.keys
9b0d87ac871518cfd8601aa456b58fa74c01194cfeb25e7f3eecf43759d6ccb4 hash.keys
$ java -jar jar/BitcoinTimestamp-1.0.1.jar decode 428bcc630b00fe431623b4e1fb0