On lightning as a "shared utxo" protocol nostr:nevent1qqsfspetwhn4yz5kmu73r949203w499x023dxkt5zultssse2g0ezlsprpmhxue69uhkummnw3ezuendwsh8w6t69e3xj730qgsvh300dvquh50l5t9et2257pxrsk5ndsdgdcdmnnxl9nc0f6l2ejcrqsqqqqqpwteaxh