What is a bitcoin extended public key?
Excuse me, I've been hearing quite a bit about Bitcoin and its underlying technology, but I'm still a bit hazy on some of the more technical aspects. Could you please elaborate on what a Bitcoin extended public key is? I understand it's related to managing multiple Bitcoin addresses efficiently, but how does it actually work? Does it have any advantages over traditional public key systems? And how secure is it? I'd appreciate a concise yet thorough explanation as I'm keen to gain a deeper understanding of this fascinating technology.