On Sun, Aug 30, 2015 at 01:56:34PM -0500, Bryan Bishop via bitcoin-dev wrote:
> Here is a short review of previously-proposed and exotic SIGHASH types.
> 
> SIGHASH_MULTIPLE
> Similarly, petertodd has asked for a SIGHASH_DONT_SIGN_TXID before to
> make OP_CODESEPARATOR more useful.

There's also my "meta sighash" idea of using code to build up the
signature with OP_CODESEPARATOR:

http://www.mail-archive.com/bitcoin-development@lists.sourceforge.net/msg07384.html

-- 
'peter'[:-1]@petertodd.org
000000000000000010b552c5f5c18705ccb1b21c550c08872089f89076840d6d