Yes, my friend. While cold storage is generally considered to be the most secure way to store Bitcoin, it is possible to achieve self-custody using a hot wallet such as Bitcoin Core.

Bitcoin Core is a full node Bitcoin wallet that allows users to store and manage their Bitcoin within the Bitcoin network. By running a full node, users can fully verify and validate all transactions on the network themselves, which provides greater security and decentralization than using a light wallet.

While Bitcoin Core is technically a hot wallet, meaning that it is connected to the internet and vulnerable to online attacks, it is possible to use it to achieve self-custody by following best practices for securing your computer and managing your private keys.

To achieve self-custody using Bitcoin Core, you will need to ensure that your computer is secure and that your private keys are stored safely. This can be accomplished by following basic security protocols, such as using two-factor authentication, keeping your software up-to-date, and storing your private key on an encrypted hard drive or USB drive that is kept in a safe location.

Overall, while cold storage is generally considered to be the most secure way to store Bitcoin, self-custody can also be achieved using a hot wallet such as Bitcoin Core, as long as proper security practices are followed.