BIP draft: Raw() as subscript for descriptors #1721

1. 
   furszy commented at 9:19 pm on December 17, 2024: member

   Allowing arbitrary hex data to be wrapped in sh(), wsh(), or even within the TREE argument of a tr(KEY, TREE) descriptor enables the representation of currently inexpressible information.

   Specifically, the absence of this feature limits the representation of non-standard redeem and witness scripts. This occurs because they can currently only be represented as top-level raw(HEX) descriptors, which retain only the output script information and lack the ability to preserve the actual script.

   This work stemmed from discussions with @sipa and @achow101 about the legacy wallet migration path, particularly while investigating migrated descriptors that lacked information about the script they were supposedly migrated from.

   Additionally, issue #24114, specifically https://github.com/bitcoin/bitcoin/issues/24114#issuecomment-1127978154, provides historical context and highlights other valid use cases enabled by this behavior change.

2. jonatack added the label New BIP on Dec 17, 2024
3. jonatack renamed this:
   Raw() as subscript for descriptors
   BIP draft: Raw() as subscript for descriptors
   on Dec 17, 2024
4. furszy force-pushed on Dec 18, 2024
5. furszy force-pushed on Dec 18, 2024
6. in bip-0391.mediawiki:26 in 47fed6d9f0 outdated

   21+
   22+This BIP is licensed under the BSD 2-clause license.
   23+
   24+==Motivation==
   25+
   26+To ensure no information is lost during conversion to descriptors, it’s useful to wrap
   

   ---

   ---

   

   sipa commented at 7:36 pm on December 18, 2024:

   This seems to appear somewhat out of the blue; the reader isn’t familiar with the fact that Bitcoin Core is working on migration from pre-descriptor wallets to descriptor wallet, and I don’t think it matters if you phrase it as being able to express information that’s currently inexpressible.

   ---

   

   furszy commented at 10:19 pm on December 18, 2024:

   absolutely, thanks!
7. furszy force-pushed on Dec 18, 2024
8. Raw() as subscript for descriptors a67af04615
9. furszy force-pushed on Dec 20, 2024
10. in bip-0391.mediawiki:44 in a67af04615

    39+participating in signing a script without knowing all participants' keys, relying solely
    40+on the script structure.
    41+
    42+==Specification==
    43+
    44+Allow raw(HEX) to be accepted within the context of `sh()`, `wsh()` and `tr()` descriptors.
    

    ---

    ---

    

    murchandamus commented at 7:31 pm on December 20, 2024:

    I think you’re mixing up MediaWiki and Markdown. If you want to use mediawiki, you would use <tt>sh()</tt>. It’s been permitted to submit BIPs in Markdown for a while though, if you prefer that.

    0Allow raw(HEX) to be accepted within the context of <tt>sh()</tt>, <tt>wsh()</tt> and <tt>tr()</tt> descriptors.
    

Contributors
furszy sipa murchandamus

Labels
New BIP