Hello. I want to know about any bitcoin offline wallet which includes no third party. And can that wallet be hacked if I don't input any kind of malicious file or connect the device to Internet?
What you need is paper wallet, this is the only offline and most secured wallet I know, no internet connections, all you need to safe guard is the private key or Mnemonic seed of the offline wallet
Paper wallets are good but they will depend on us No matter which wallet we use whether offline or online, no one can hack our wallet if the wallet's private key is protected. If anyone knows the private key, there will be no benefit in using the offline wallet and it will be stolen. In addition to paper wallets hardware wallets are better than offline wallets.