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<pre>
BIP: 382
Layer: Applications
Title: Segwit Output Script Descriptors
Author: Pieter Wuille <pieter@wuille.net>
Andrew Chow <andrew@achow101.com>
Comments-Summary: No comments yet.
Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0382
Status: Draft
Type: Informational
Created: 2021-06-27
License: BSD-2-Clause
</pre>
==Abstract==
This document specifies <tt>wpkh()</tt>, and <tt>wsh()</tt> output script descriptors.
<tt>wpkh()</tt> descriptors take a key and produces a P2WPKH output script.
<tt>wsh()</tt> descriptors take a script and produces a P2WSH output script.
==Copyright==
This BIP is licensed under the BSD 2-clause license.
==Motivation==
Segregated Witness added 2 additional standard output script formats: P2WPKH and P2WSH.
These expressions allow specifying those formats as a descriptor.
==Specification==
Two new script expressions are defined: <tt>wpkh()</tt>, and <tt>wsh()</tt>.
===<tt>wpkh()</tt>===
The <tt>wpkh(KEY)</tt> expression can be used as a top level expression, or inside of a <tt>sh()</tt> descriptor.
It takes a single key expression as an argument and produces a P2WPKH output script.
Only keys which are/has compressed public keys can be contained in a <tt>wpkh()</tt> expression.
The output script produced is:
<pre>
OP_0 <KEY_hash160>
</pre>
===<tt>wsh()</tt>===
The <tt>wsh(SCRIPT)</tt> expression can be used as a top level expression, or inside of a <tt>sh()</tt> descriptor.
It takes a single script expression as an argument and produces a P2WSH output script.
<tt>wsh()</tt> expressions also create a witnessScript which is required in order to spend outputs which use its output script.
This redeemScript is the output script produced by the <tt>SCRIPT</tt> argument to <tt>wsh()</tt>.
Any key expression found in any script expression contained by a <tt>wsh()</tt> expression must only produce compressed public keys.
The output script produced is:
<pre>
OP_0 <SCRIPT_sha256>
</pre>
==Test Vectors==
TBD
==Backwards Compatibility==
<tt>wpkh()</tt>, and <tt>wsh()</tt> descriptors use the format and general operation specified in [[bip-0380.mediawiki|380]].
As these are a wholly new descriptors, they are not compatible with any implementation.
However the scripts produced are standard scripts so existing software are likely to be familiar with them.
==Reference Implementation==
<tt>wpkh()</tt>, and <tt>wsh()</tt> descriptors have been implemented in Bitcoin Core since version 0.17.
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