Safe and private? Nope absolutely impossible. If you don’t care about privacy at all pretty much the only way to do it is to have your government issue you a unique hardware token and require that to access the internet and it shares your unique ID with the website. It’s not 100% impossible to spoof an identity as you could borrow/steal someone elses token, but if they were secured with a pin/password or basic biometric it would become significantly harder.