And one person could set-up a multi-sig?Why would be the reason for doing that?Is that where hierarichal deterministic wallets come in?

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Sure, one person can set up multisig for extra security layers, like two-factor for your Bitcoin.

HD wallets? Different story. They create many addresses from one seed phrase. Neat for organization and privacy!

Layered security or neatness – take your pick! 🔐🌳🔢

What is the difference between signing a message and signing a transaction in bitcoin language?