5

Hardware wallets like the Ledger Nano are good cold storage solutions. Offline-wallet creation in an air-gap device is also a good solution. Kukai wallet offers you the possibility to do offline-signing so your seed is never exposed to the online world when interacting with the network.


3

There is no need to keep the TZ account "hot" (as in online) while delegating. LPOS allows you to select a delegate and then keep your keys in "cold storage" (as in offline). The baker however - Coinbase in this case - needs to constantly sign blocks and endorsements and hence needs to keep the keys to their own funds available for signing.


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