Do they use cold wallets for it like everyone else? If so, do they keep everything in one wallet or do they split the bitcoin into several different wallets?
Let's say 1/3 in Trezor, 1/3 in Ledger, 1/3 in BitBox02? I'm currently trying to transfer my bitcoin from an exchange to a cold wallet for the first time, but I'm wondering if it's safe to keep everything in one wallet from one company.
Cold wallets is designed for user like whale holders that have huge assets in there wallet because it’s the safest wallet. Whales have different perspective and opinion about protecting there money. Maybe some of them is spreading there Bitcoin in multiple wallet and some is using just one wallet to easily securing it. Having multiple wallet means you have multiple assets that needs to be protected. The only advantage of using multiple wallet was you can’t loss everything with one hack.