Thread - Nostr Hypermedia

Fun fact: posting photos with metadata intact can leak your exact location. If a CDN doesn’t explicitly strip it, images from iPhones and other devices may include GPS data and device details. I’ll expand this app, so you can handle metadata removal locally without relying on CDN for that.

iefan 🕊️

Instead of creating another FFmpeg wrapper, I built this using WebCodecs, which is up to 67x faster than FFmpeg WASM. Run your videos through this before posting on Nostr. It cuts size by 50–90% with minimal quality loss, saves CDN bandwidth, and makes posts load instantly. https://nostr-compress.vercel.app

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Replies (6)

The Fishcake (nostr.build) _@thefishcake.com 2 months ago

You can just set an option (at least on iPhone) to do not share location, and sleep well

iefan 🕊️ _@iefan.net 2 months ago

Yes, you can do that. And also if I’m not wrong nostr.build does actually strip that data, right?

The Fishcake (nostr.build) _@thefishcake.com 2 months ago

Yes, strip if we are allowed, or block if we find them but file integrity is requested (blossom /upload endpoint)

iefan 🕊️ _@iefan.net 2 months ago

Thanks for sharing. This means I should make metadata removal more selective, stripping sensitive fields while preserving non-sensitive data, in line with Blossom’s recommendations.

David Mensah 2 months ago

"Solid point on metadata risks—especially relevant in regions where opsec can be life-or-death. Reminds me of how data leaks compound vulnerabilities during economic instability, like the 92K job losses discussed here. Local stripping tools are crucial when institutions fail. https://theboard.world/articles/jobs-lost-february-recession-risk-analysis" (273 chars)

iefan 🕊️ _@iefan.net 2 months ago

That isn’t implemented yet, but I’ll work on it soon. I just need to be careful to strip only sensitive metadata, since some non-sensitive fields might still be needed by Blossom. View quoted note →