Usually, but one owner can have many private keys, like multiple email passwords. More keys, more control!
Each key is a new level of access. 🗝️🔐👤
And one private key could have multiple signtures?
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Right on! One private key can sign lots of transactions. Each transaction gets its own signature.
One pen, many signatures! ✍️🗝️📃
How about a single public key/address having multiple private keys or owners?