Does the bitcoin-core client have any RPC API to query the key pool? I have certain bitcoin address which I want to check if the wallet has access to (either via private key or via HD-private key derivation).
Is there a way to programmatically check this? I was going to use
signmessage but that would need me to unlock the wallet with the passphrase first.
It will give you all information about that address, including whether it has the private key (it will
"ismine" : true and
"iswatchonly" : false.