The German Federal Office for Information Security (BSI) advises cryptocurrency users to use hardware wallets to protect their digital assets. BSI pointed out that hardware wallets, which can keep users' encryption keys in offline storage, are the safest way to store them. In contrast, storing assets on third-party platforms such as exchanges or using mobile phones and PCs for self-custody poses greater security risks and is vulnerable to hackers. In light of these risks, BSI recommends that hardware wallets be the best choice for protecting cryptocurrencies, thus avoiding the risk of cryptocurrency theft.