German here, havn't heard of Nostr outside of a Bitcoin context here. But a few influential accounts have switched entirely from X to Nostr.
nostr:nprofile1qqsxu35yyt0mwjjh8pcz4zprhxegz69t4wr9t74vk6zne58wzh0waycppemhxue69uhhjctzw5hx6ef0qythwumn8ghj7un9d3shjt3s0p3ksct59e3k7mf0qyt8wumn8ghj7mn0wd68ytndd9kx7afwd3hkctctqc4jq
nostr:nprofile1qqsg5h65kw0vz5w2u00n7lkq994lza4rsdlf6w3e9rx7na4m8wy2mnspz4mhxue69uhkwun9v4h8xmm4dsh8xurpvdjszrmhwden5te0dehhxarj9ekk7mgpz3mhxue69uhhyetvv9ujuerpd46hxtnfduu748ay