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CryptoKitties is not secure. The randomness can be cheaply broken.
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A blockchain lottery's reward needs to be smaller than the cumulative value of all the block rewards during the time period when the randomness was generated. You can learn more here: https://github.com/zack-bitcoin/amoveo/blob/master/docs/design/sortition_chains_random.md
Cryptokitties uses the block hash as entropy for the random number generator when it breeds the kitties. So it is vulnerable to this attack, just like all other kinds of lotteries.
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