The most secure way to store cryptocurrencies is to use a hardware wallet like Trezor or Ledger. These wallets are physical devices that store your private keys and allow you to access your cryptocurrencies without exposing your private keys to the internet. Additionally, they also offer enhanced security features such as multi-factor authentication, multi-signature authentication, and built-in virus scanning. Another secure method to store cryptocurrencies is to use a paper wallet. These wallets are usually free to download and can be printed out on paper. They generate and store your private keys offline so no one has access to them. Finally, you could also use a cold storage wallet, which is an offline computer system used to store cryptocurrencies. These systems are not connected to the internet and are considered to be extremely secure.