BIP 0384

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This page describes a BIP (Bitcoin Improvement Proposal).
Please see BIP 2 for more information about BIPs and creating them. Please do not just create a wiki page.

Please do not modify this page. This is a mirror of the BIP from the source Git repository here.

  BIP: 384
  Layer: Applications
  Title: combo() Output Script Descriptors
  Author: Pieter Wuille <>
          Andrew Chow <>
  Comments-Summary: No comments yet.
  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: combo(KEY). This 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 pkh() 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 both a wpkh() and sh(wpkh()) expression.

Test Vectors


Backwards Compatibility

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.

Reference Implementation

combo() descriptors have been implemented in Bitcoin Core since version 0.17.