Bitcoin accounts and Nostr are exactly the same thing. One just has an npub prefix, and the other has a tb prefix. But that is for DISPLAY purposes only. This being the case, nostr has best-in-class property rights via the bitcoin block chain. Nobody is using this yet. But when activated, it is a super power. - Melvin Carvalho
And I found this on Albys Blog
The introduction of Master Key gave the Alby Extension a superpower of having one identity, secured by one 12-word recovery phrase, that can be used on Nostr, Liquid Network, Bitcoin base layer and as login with lightning (LNURL-auth). Keys to those protocols are derived from your Master Key and never leave your local machine, even if you use a web app.
Nostr is an identity layer on top of bitcoin.
Your wallets all have nostr identities......