Through meeting. When I understand nostr:nprofile1qyghwumn8ghj7mn0wd68ytnhd9hx2tcppemhxue69uhkummn9ekx7mp0qythwumn8ghj7un9d3shjtnswf5k6ctv9ehx2ap0qyt8wumn8ghj7un9d3shjtnddaehgu3wwp6kytcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsqgpjuxp8vd29p6ancknaztql3eajk52y8xkppfn7au7elkw9c68zg59r80f0 right it is not about a general standard. But rather a personal list to be able to mark accounts you know in person from those you only got to know on the internet.