public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: James MacWhyte <macwhyte@gmail.com>
To: Johnson Lau <jl2012@xbt.hk>,
	 Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>,
	 Matthew Roberts <matthew@roberts.pm>
Subject: Re: [bitcoin-dev] BIP: OP_PRANDOM
Date: Fri, 20 May 2016 14:30:52 +0000	[thread overview]
Message-ID: <CAH+Axy5G9j-0TXE6dCQ69pH=TKPDtFibfCf_tZ87o88FVd0pxw@mail.gmail.com> (raw)
In-Reply-To: <CBBB62CD-2E30-4C9F-962E-3F340B29EDA7@xbt.hk>

[-- Attachment #1: Type: text/plain, Size: 1074 bytes --]

Matthew,

Other than gambling, do you have any specific examples of how this could be
useful?

On Fri, May 20, 2016, 20:34 Johnson Lau via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> 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.
>
>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

[-- Attachment #2: Type: text/html, Size: 1849 bytes --]

  reply	other threads:[~2016-05-20 14:31 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-20 10:57 [bitcoin-dev] BIP: OP_PRANDOM Matthew Roberts
2016-05-20 11:34 ` Johnson Lau
2016-05-20 14:30   ` James MacWhyte [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAH+Axy5G9j-0TXE6dCQ69pH=TKPDtFibfCf_tZ87o88FVd0pxw@mail.gmail.com' \
    --to=macwhyte@gmail.com \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=jl2012@xbt.hk \
    --cc=matthew@roberts.pm \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox