BIP: 384 Layer: Applications Title: combo() Output Script Descriptors Author: Pieter Wuille <email@example.com> Andrew Chow <firstname.lastname@example.org> Comments-Summary: No comments yet. Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0384 Status: Draft Type: Informational Created: 2021-06-27 License: BSD-2-Clause
This document specifies
combo() output script descriptors. These take
a key and produce P2PK, P2PKH, P2WPKH, and P2SH-P2WPKH output scripts if
applicable to the key.
This BIP is licensed under the BSD 2-clause license.
In order to make the transition from traditional key based wallets to descriptor based wallets easier, it is useful to be able to take a key and produce the scripts which have traditionally been produced by wallet software.
A new top level script expression is defined:
expression can only be used as a top level expression. It takes a single
key expression as an argument and produces either 2 or 4 output scripts,
depending on the key. A
combo() expression always produces a P2PK and
P2PKH script, the same as putting the key in both a
pk() and a
expression. If the key is/has a compressed public key, then P2WPKH and
P2SH-P2WPKH scripts are also produced, the same as putting the key in
combo() descriptors use the format and general operation specified in
380. As this is a wholly new
descriptor, it is not compatible with any implementation. However the
scripts produced are standard scripts so existing software are likely to
be familiar with them.
combo descriptors have been implemented in Bitcoin Core since version