Grasp personal keys for the pockets may be retrieved by utilizing listdescriptors true and inspecting the output. There’s additionally some ongoing work to make it simpler to export these keys with out having to interpret a descriptor.
Authentic reply from Aug 2021
It’s at the moment not doable to export personal keys from a descriptor pockets.
There’s at the moment an open pull request which permits the listdescriptors command to optionally return descriptors with personal keys. This would be the technique by which personal keys may be exported from a descriptor pockets.
Word that solely the grasp personal key utilized in a descriptor shall be allowed to be exported from descriptor wallets. It’s because descriptor wallets shall be utilizing unhardened derivation for the kid keys and there’s a recognized concern the place having the guardian xpub and a toddler key derived with unhardened derivation will enable the guardian xprv to be computed. So to be clear to customers that what they’re doing is probably unsafe, we are going to solely enable exporting the grasp personal key (it’s extra clearly unsafe when you’ve got the grasp personal key as customers are unlikely to learn about this weak spot and might imagine that giving out baby keys and the guardian xpub is secure).
