yep, quite similar concept to https://bitblik.app just with LN hold invoices (like nostr:npub1gdfr0r0an32jalqryqlvpn3gsef2hu832wv6kp5p2gt2aqa2n8yqd42ffw ) instead of ecash.

here's the faq: https://github.com/bitblik/client/blob/main/assets/faq/faq_en.md