UPDATE: This code was trivially exploited since the "random" number is easily guessed using the same algorithm that generated it.
Solidity contract providing a (completely non-) random number generator service. The current version is deployed at 0xaED5a41450B38FC0EA0F6F203a985653fE187d9c.
There is a function called Guess(uint) and an event called RandomNumberGuessed(uint random_number, address guesser) that announces if you're right. If you think you can predict or cause the Random() to have a certain value, feel free to deposit some ETH into the contract & call Guess() with the correct value to retrieve it.
There is also a one-time 10 Finney reward there for the first one who guesses correctly. If you are able to guess correctly, please file an Issue here. I would like rng.sol to be reliable enough to use securely. Thanks, good luck. :)
This contract is deployed at 0xaED5a41450B38FC0EA0F6F203a985653fE187d9c with the ABI:
[ { "constant": true, "inputs": [], "name": "last", "outputs": [ { "name": "", "type": "uint256" } ], "type": "function" }, { "constant": false, "inputs": [ { "name": "_guess", "type": "uint256" } ], "name": "Guess", "outputs": [ { "name": "", "type": "bool" } ], "type": "function" }, { "constant": false, "inputs": [ { "name": "seed", "type": "uint256" } ], "name": "RandomNumberFromSeed", "outputs": [ { "name": "", "type": "uint256" } ], "type": "function" }, { "constant": false, "inputs": [], "name": "RandomNumber", "outputs": [ { "name": "", "type": "uint256" } ], "type": "function" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "random_number", "type": "uint256" } ], "name": "GeneratedNumber", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "random_number", "type": "uint256" }, { "indexed": false, "name": "guesser", "type": "address" } ], "name": "RandomNumberGuessed", "type": "event" } ]