Amethyst expects lowercase 'host' as did zap.stream https://github.com/vitorpamplona/amethyst/blob/7a1dcbc76e4a69e712b6f2e72f0d9568db02cc7a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/ParticipantTag.kt#L79C21-L79C39