Using the hash of multiple blocks does not make it any safer. The miner of the last block always determines the results, by knowing the hashes of all previous blocks.
> > == Security > Pay-to-script-hash can be used to protect the details of contracts that use > OP_PRANDOM from the prying eyes of miners. However, since there is also a > non-zero risk that a participant in a contract may attempt to bribe a miner > the inclusion of multiple block hashes as a source of randomness is a must. > Every miner would effectively need to be bribed to ensure control over the > results of the random numbers, which is already very unlikely. The risk > approaches zero as N goes up.
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