[Bitcoin-development] BIP - Selector Script

Tier Nolan tier.nolan at gmail.com
Fri Apr 25 18:49:35 UTC 2014

This is a BIP to allow the spender to choose one of multiple standard
scripts to use for spending the output.


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.


The script allows multiple standard scripts to be included in the

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

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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