If not, I would like to know if there is a way to check the balance of an address using the btc network and not a blockchain explorer, for example with some node calls running btc core.
Bitcoin Core doesn't have address index, however you can connect your hardware wallet to Bitcoin Core.
Thanks for your reply.
Does this mean that you cannot check the balance of an address with Bitcoin Core and that the utility of connecting the hardware wallet to Bitcoin Core is to use that node to issue new transactions?