> Currently, descriptors have an Expand() function which returns public keys and scripts for a specific index of a ranged descriptor. But the private key for a specific index is not given. This allows private keys for specific indices to be derived. This also allows those keys to be imported through the importmulti RPC rather than having to provide them separately.
This is a backport of Core PR15024 [1/4]
Commit https://github.com/bitcoin/bitcoin/pull/15024/commits/a4d1bd1a29be2dcc5e00c63b6b41916b1c466de0