White Noise (app) uses MDK (software development kit - it's a library for all devs to use).
MDK is an implementation of the Marmot spec (the description in english of how all secure messaging operations should work).
nostr:nprofile1qy88wumn8ghj7mn0wvhxcmmv9uq3wamnwvaz7tmjv4kxz7fwwpexjmtpdshxuet59uqzqawhxlp5wfr3q2wyfpmtxvxj9ppg3fp80x6erghdfk4pcmq8a7hhwp9puf isn't going anywhere. This is just a step to make things more interoperable and easier for other developers to add secure messaging to their own apps.