Vitalik Buterin, the co-founder of Ethereum, stressed the importance of self-custody in a recent social media post. According to Buterin, social recovery and multi-signature wallets are effective methods to achieve this goal. He personally uses a multi-signature wallet to store most of his funds, and so does the Ethereum Foundation. Buterin suggested using social recovery to store a small portion of hot money in personal or organizational wallets, as well as multi-signature wallets for savings. Self-custody is crucial in the world of cryptocurrency, and using multiple security measures can help ensure the safety of the funds.