Bitcoin Core can solely signal messages from legacy bitcoin addresses, in my expertise.
Sure, that is appropriate. Message signing is at the moment solely supported for P2PKH addresses.
With legacy addresses being deprecated within the software program, does this imply that Bitcoin Core will not have the ability to signal any messages from the brand new descriptor wallets verifying somebody holds the keys to their bitcoin addresses?
That is conflating two issues: legacy wallets and legacy addresses. They’re unbiased. If you wish to, you possibly can create/import a descriptor for P2PKH addresses in a descriptor pockets, which may generate P2PKH addresses, for which message signing will work. You can even use a legacy pockets to assemble P2SH or P2WPKH addresses, which do not help message signing.
If that is true, is there any work being executed on including message signing performance for bech32 addresses?
Sure, there’s an ongoing although considerably stalled effort to outline and implement a generic message signing normal that might work for any tackle kind, BIP322.
