From: Johnson Lau <jl2012@xbt•hk>
To: Matthew Roberts <matthew@roberts•pm>,
bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP: OP_PRANDOM
Date: Fri, 20 May 2016 13:34:03 +0200 [thread overview]
Message-ID: <CBBB62CD-2E30-4C9F-962E-3F340B29EDA7@xbt.hk> (raw)
In-Reply-To: <CAAEDBiEB_RXBjrLB8kDb52bJOwZK-arVeHA_9LyoDgAraLKHNg@mail.gmail.com>
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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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next prev parent reply other threads:[~2016-05-20 11:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-20 10:57 Matthew Roberts
2016-05-20 11:34 ` Johnson Lau [this message]
2016-05-20 14:30 ` James MacWhyte
2016-05-20 15:05 ` Matthew Roberts
2016-05-20 18:32 ` Eric Martindale
2016-05-22 13:30 ` Jeremy
2016-05-24 14:30 ` Sergio Demian Lerner
2016-05-24 14:36 ` Sergio Demian Lerner
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