Tellor Random Number Generator

The Tellor RNG is a pseudorandom number generator.

It works as follows:

1. A user requests a random number, sending two token payments, a seed reward and an oracle reward. The user receives a unique queryId which will be used to retrieve the random number from tellor. A seed value is generated from the most recent block hash.
2. During a period of time, anyone can submit a bytes32 value which gets hashed with the previous seed to generate a new seed. The last address to submit a value gets the seed reward.
3. After the seed period ends, tellor reporters hash the seed a large number of times and submit the final hash to tellor as the random number.
4. The user waits for a period of time to allow a bad value to be disputed.
5. Finally, the user retrieves their random number from tellor.

Hashing the Seed

The number of hashes required to determine the random number depends on the numberOfHashes variable in the SeedGenerator contract's Seed struct. The seed should be hashed using the three following hashing algorithms in the following order: keccak256, sha256, ripemd160. After numberOfHashes hashes have been taken, the last value should be hashed one more time using keccak256. This last value is what should be reported to the tellor oracle.