If the online casino is trusted and licensed by the UKGC, then chances are that any of the payment methods are safe. However, some are safer than others, but that isn’t down to the online casino. Cryptocurrency such as Bitcoin is currently the safest payment method, purely because there is no opportunity for a security breach or for someone to steal your coins. The system is built on a blockchain which allows full transparency, but you can’t get into it if you don’t have the special key for your account. Digital wallets such as PayPal are also incredibly safe. If there is a security breach, they will often return your money. This is the same for when an organisation takes money out of your account without permission. You can file a dispute and most likely get the funds returned to your balance.