So I just tried it. And I get a "Empty response". What does that mean?
That's the response if that command is executed successfully.
Otherwise, it'll return with "
Block not found", "
blockhash must be of length 64" or other errors.
You can immediately see that the block is invalidated in bitcoind with the lines
InvalidChainFound: invalid block=n or in the logs (
debug.log) file.