Bitcoin Layers - from nostr:npub1fceadcz5zunfrxkv33437e27z86tehs95gtc4z7wjkeexel8llrq50sy0m . 

Just followed a fantastic presentation from Kieran on nostr:npub19p345mfx9cdks8a7p5vzyt9vkhavueh7g57murk24mwa0mn08fes8wdkan https://i.nostr.build/zdOn4.jpg