PubKey for testnet4 and mainnet. More details: Nostr identity is based on bitcoin taproot. The Npub is an enoding of your taproot key with npub prefix. Bitcoin taproot and testnet use the prefixes bc1p and tb1p.
Doesn’t getalby do this when you create a master key?
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Yes, but Nostr extension isn’t connected with LN. Only via relays and your private keys.
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