Grasp personal keys for the pockets might 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 present not potential to export personal keys from a descriptor pockets.
There’s at present 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 might be exported from a descriptor pockets.
Be aware that solely the grasp personal key utilized in a descriptor will probably be allowed to be exported from descriptor wallets. It’s because descriptor wallets will probably be utilizing unhardened derivation for the kid keys and there’s a recognized difficulty the place having the dad or mum xpub and a toddler key derived with unhardened derivation will enable the dad or mum xprv to be computed. So to be clear to customers that what they’re doing is doubtlessly unsafe, we’ll solely enable exporting the grasp personal key (it’s extra clearly unsafe when you might have the grasp personal key as customers are unlikely to learn about this weak point and might imagine that giving out baby keys and the dad or mum xpub is protected).
