Fundamentally, it is difficult to protect 256 bits of information from a highly motivated attacker. You can make it more difficult by using things like cold wa

Fundamentally, it is difficult to protect 256 bits of information from a highly motivated attacker. You can make it more difficult by using things like cold wallets with Shamir Secret Sharing schemes, but $70m of seemingly untraceable assets is an attractive target. Even if you require a quorum of ten people to access the cold wallet, that’s still $10m per person if split amongst themselves. And someone has to build that system in a trustworthy way in the first place.