What is a protocol? nostr:npub18ams6ewn5aj2n3wt2qawzglx9mr4nzksxhvrdc4gzrecw7n5tvjqctp424 nostr:npub1aeh2zw4elewy5682lxc6xnlqzjnxksq303gwu2npfaxd49vmde6qcq4nwx nostr:npub1hqaz3dlyuhfqhktqchawke39l92jj9nt30dsgh2zvd9z7dv3j3gqpkt56s nostr:npub14qz92uedt0a8jte8jqg63jr3s5cc99cej36jh883z6tprlu354uqqe2q26 nostr:npub1key55ax33gkl50uqemvl4khrtqrhzm7wzpc7fhseutt5ddkcwcrqgxlt3h https://i.nostr.build/Z5a0M.jpg