I believe you meant to link here instead?
https://github.com/TierNolan/bips/blob/bip4x/bip-0046.mediawiki
This looks reasonable from a brief skim over, but does not define any use
cases (it mentions "necessary for atomic cross chain transfers", but does not
explain how it is useful for that - perhaps that belongs in another BIP you
haven't written yet, though). IMO, it should also require P2SH.
Luke
On Friday, April 25, 2014 6:49:35 PM Tier Nolan wrote:
> This is a BIP to allow the spender to choose one of multiple standard
> scripts to use for spending the output.
>
> https://github.com/TierNolan/bips/blob/bip4x/bip-0045.mediawiki
>
> This is required as part of the atomic cross chain transfer protocol. It
> is required so that outputs can be retrieved, if the process ends before
> being committed.
>
> https://bitcointalk.org/index.php?topic=193281.msg2224949#msg2224949
>
> The script allows multiple standard scripts to be included in the
> scriptPubKey.
>
> When redeeming the script the spender indicates which of the standard
> scripts to use.
>
> Only one standard script is actually executed, so the only cost is the
> extra storage required.
>
> A more ambitious change would be a soft fork like P2SH, except the spender
> is allowed to select from multiple hashes. Effectively, it would be
> "Multi-P2SH".
>
> This gets much of the benefits of MAST, but it requires a formal soft fork
> to implement.
>
> If there is agreement, I can code up the reference implementation as a PR.
> The multi-P2SH might actually be easier.
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