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RE: "Child Pays for Parent" on Electrum with Ledger Nano S
I think it all is a little too confusing even for someone like me who has followed Bitcoin closely since late 2013, but that is where the fun is at.
How do you know if you are working with a segwit bitcoin address or a legacy address? I've heard about this a little bit on the Let's Talk Bitcoin podcast but haven't quite looked into the specifics yet.
I'm not entirely sure, and I don't think the structure of the addresses themselves are at all different. I think what matters is how the BTC is sent. So on the Ledger, for example, it now prompts me if I'm using Legacy or Segwit. If I say Segwit, it shows me essentially an empty wallet (new addresses were created, as far as a I know). I want to use Segwit, I have to send my BTC to those new addresses (again, as far as a I know). After that, it will use the Segwit protocol for sending.
I've used exchanges and some of popular Bitcoin wallets since Segwit activation and don't recall running into anything like that. It's probably all abstracted away.