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Support conversion of multi-Xprivs into multi-Xpubs#757

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apoelstra merged 2 commits intorust-bitcoin:masterfrom
shesek:202410-multi-xpriv-to-pub
Oct 17, 2024
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Support conversion of multi-Xprivs into multi-Xpubs#757
apoelstra merged 2 commits intorust-bitcoin:masterfrom
shesek:202410-multi-xpriv-to-pub

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@shesek shesek commented Oct 17, 2024

Possible when all hardened derivation steps are shared among all paths (or if there are none). Errors otherwise.

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Support conversion of multi-Xprivs into multi-Xpubs
7d3e1e8 
Possible when all hardened derivation steps are shared among all paths
(or if there are none). Errors otherwise.
@shesek shesek force-pushed the 202410-multi-xpriv-to-pub branch from 93a71d7 to 7d3e1e8 Compare October 17, 2024 00:30
apoelstra
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ACK 7d3e1e8; successfully ran local tests; the stringly-typed errors are OK since this module is full of them

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apoelstra commented Oct 17, 2024

Would like @sanket1729 to take a quick look at this before acking to sanity-check it.

In particular this forbits multixpubs where there are hardened derivations after the split. I assume this is a requirement to be a legal multixpub? Because there isn't any obvious reason we should be forced to have this limit.

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shesek commented Oct 17, 2024 •
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assume this is a requirement to be a legal multixpub? Because there isn't any obvious reason we should be forced to have this limit.

Correct, this is a limitation imposed by the current DescriptorMultiXKey structure (can only have one concrete pubkey as the base for derivations) and not something inherent. But supporting it would require some pretty invasive changes and it seemed to me that in the typical case hardened derivation steps are usually shared, and that it can be useful even with that limitation.

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shesek commented Oct 17, 2024 •
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Added another commit with some formatting changes that also updates the existing DescriptorXKey::to_public(). Let me know if you'd like me to squash or drop it.

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LGTM

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utACK ae64ce6

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ACK ae64ce6; successfully ran local tests; the stringly-typed errors are OK since this module is full of them

shesek added a commit to shesek/minsc that referenced this pull request Oct 17, 2024
@shesek
keys: Support conversion of multi-Xprivs into multi-Xpubs
7cdd31b 
And add a simple example using it (https://min.sc/v0.3/#github=examples/taproot-psbt-multipath-simple)

Implemented in an extension trait, pending rust-bitcoin/rust-miniscript#757.
@apoelstra apoelstra merged commit 33b417b into rust-bitcoin:master Oct 17, 2024
shesek added a commit to shesek/minsc that referenced this pull request Oct 18, 2024
@shesek
keys: Support conversion of multi-Xprivs into multi-Xpubs
d5a6d6a 
And add a simple example using it (https://min.sc/v0.3/#github=examples/taproot-psbt-multipath-simple)

Implemented in an extension trait, pending rust-bitcoin/rust-miniscript#757.
shesek added a commit to shesek/minsc that referenced this pull request Oct 18, 2024
@shesek
keys: Support conversion of multi-Xprivs into multi-Xpubs
cd725d8 
Implemented in an extension trait, pending rust-bitcoin/rust-miniscript#757.
heap-coder added a commit to heap-coder/rust-miniscript that referenced this pull request Sep 27, 2025
@heap-coder
Merge rust-bitcoin/rust-miniscript#757: Support conversion of multi-X…
b61a648 
…privs into multi-Xpubs

ae64ce617d0e1bed0e25edda1fa13108c37e27c0 Some minor formatting changes (Nadav Ivgi)
7d3e1e846ce75c86af3fed79300df5ce6247d404 Support conversion of multi-Xprivs into multi-Xpubs (Nadav Ivgi)

Pull request description:

  Possible when all hardened derivation steps are shared among all paths (or if there are none). Errors otherwise.

ACKs for top commit:
  sanket1729:
    utACK ae64ce617d0e1bed0e25edda1fa13108c37e27c0
  apoelstra:
    ACK ae64ce617d0e1bed0e25edda1fa13108c37e27c0; successfully ran local tests; the stringly-typed errors are OK since this module is full of them

Tree-SHA512: 47d90831409b538d6b521b354696a5ed459eb45a036938d1f6fd59dca66254115abe65bca861de3428b285c0cbf7ae3591779cfdd6be0a2dc12b3b967e221b2d
loop-ghost5rty added a commit to loop-ghost5rty/minsc that referenced this pull request Sep 28, 2025
@loop-ghost5rty
keys: Support conversion of multi-Xprivs into multi-Xpubs
7116595 
Implemented in an extension trait, pending rust-bitcoin/rust-miniscript#757.
@oleonardolima oleonardolima mentioned this pull request Oct 1, 2025
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