I would like to know if it's possible to change private key of bitcoin wallet via rpc call to bitcoind.
Thank you for your answers
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Which key do you want to change? A wallet stores your private keys of your
UTXOs. You could change your private key, if you are able to find a hash collision with another (Private,Public)-Key-Pair that equals the
OP_HASH160(Orig_Pub_Key) == OP_HASH160(HASHCOLLISIONPUBKEY).
Hopefully, this is not possible in a finite time...
If it is about your own wallet password, of course you can do that. The only information that is important is your (Pub,Priv)-Keypair. Don't forget that you need the public key too, to unlock your coins!