So purpose-based, right? I still could use my profile here for sharing things publicly? But... the same way you publish a Lightning address to your kind 0 profile data, why not also put in a Bitcoin address field? This could support single-key addresses (like P2TR, P2PKH etc., still bad for privacy, but not tied to your nsec), but also PM8T (BIP-47) or silent payment addresses. You want ro see these as well, right?