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Message-ID: <53E26434.2070502@monetize.io>
Date: Wed, 06 Aug 2014 13:21:56 -0400
From: Mark Friedenbach <mark@monetize.io>
Organization: Monetize.io Inc.
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To: Tom Harding <tomh@thinlink.com>,
Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
References: <CA+iPb=HkxeVPF0SynxCPgUkq4msrdfayFrVNFjzg29rFwqXv1w@mail.gmail.com> <CAJHLa0O2wFq2Vs5Bes_8x1q_j0VC+U4DQkx=6GqT8w5e8Lh5Qg@mail.gmail.com> <CA+iPb=ET+A-qB8TgPX8D-ut1DWnq9tZJ=14igfRVWO6eog6Xgw@mail.gmail.com> <53E1A8AF.4030206@thinlink.com> <CAJHLa0MfRhCPX8H92qc1kSebc=WrUzmSgbG331t4-zDHhTNu4w@mail.gmail.com> <CANEZrP3eEiLxYfsAURRm4ysfS4TRgXxa_THxJ43cVH1OyR95JQ@mail.gmail.com> <53E23F49.3020605@thinlink.com> <CAJHLa0OtPA3DGQuJhp3zkK5dnBux6TFAw3qDsBdO0zaxrqBgRg@mail.gmail.com> <CALxbBHXh-Fktsr96PMXdohJdgcUKoNreJ-ZuApKOX3-qSkdk2w@mail.gmail.com> <63a80796-609e-43f5-9280-4cd8cf5d2648@email.android.com> <CAJHLa0OQJEvQht_chF1gVG_BOwp=DW0zOOo3VE_acZonsSguWw@mail.gmail.com>
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Subject: Re: [Bitcoin-development] deterministic transaction expiration
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On 08/06/2014 01:02 PM, Tom Harding wrote:
> With first-eligible-height and last-eligible-height, creator could
> choose a lifetime shorter than the max, and in addition, lock the whole
> thing until some point in the future.
Note that this would be a massive, *massive* change that would
completely break bitcoin output frangibility. Merchants would have to
start demanding input history back to a certain depth in order to ensure
they are not exposing themselves to undue reorg-expiry risk.
There are useful applications of a consensus-enforced expiry,
particularly within a private (signed block) side chain, and for that
reason it is useful to have a discussion about the merits of an nExpiry
field or BLOCK_HEIGHT / BLOCK_TIME opcode, and methods for achieving
either. However I don't see this ever becoming part of the public
bitcoin network.
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