Even secure vault sounds hard for avg user.
The most simple and probably easy to understand would be simple words like Login App, we should call tha a Nostr Login Application and nsecbunker link should be private login link.
nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqyt8wumn8ghj7un9d3shjtnswf5k6ctv9ehx2aqpzemhxue69uhkummnw3ezuct60fsk6mewdejhgqpq0wzfa7jkqj6c65xyr93hhxrns37ml9tss82jvymv8fymwdtu6ctsylwf4d what do you think?