Multisig Wizard tracking issue #35645

This issue tracks the work to bring guided multisig wallet setup to the GUI (gui-qml) i.e. a setup wizard backed by interfaces::Wallet methods so that N participants, each running Bitcoin Core, can create a k-of-n multisig (k ≤ n) without hand-assembling descriptors on the command line.

It complements the multisig umbrella issue #24861, which tracks the backend primitives needed for multisig.

Design / supporting document: https://gist.github.com/pseudoramdom/4e14d21a93323217cfe016885285b9aa

Add keys & collect Keys

• #29136 : addhdkey RPC to generate an HD key into a blank wallet, parked as unused(KEY)
  • #35436 - addhdkey: Corresponding wallet interface
• #32784 - derivehdkey: account xpub at a chosen (BIP-87) path
  • Refactor into wallet helper plus interfaces::Wallet::deriveHDKey()
• ParseKeyExpression - validate a pasted key expression
• setKeyLabel - per-key labels keyed by master fingerprint

Assemble & verify descriptor

• createmultisigdescriptor - descriptor-first utility function; P2WSH and P2TR script-path; sortedmulti, ranged, multipath descriptor.
• interfaces::Wallet::analyzeDescriptor - preflight checks returning if wallet can sign, own slot, threshold, output type, cosigner fingerprints/paths, first address, checksum, (GUI-renderable script representation?)

Import

• #34861 - Add wallet interface for importDescriptors
• #35377 - import a public multisig descriptor into a wallet that holds one of the keys
  • Label the imported descriptor - To be shown at the time of spending

See also

• #24861 - multisig backend umbrella ("Awesome multisig PR labyrinth guide")
• doc/multisig-tutorial.md - current CLI workflow

I think a good intermediate step would be to have a Python based multisig (setup) wizard, that would perform the same steps you have in mind for the GUI.