Well, you already said very similar strategy that i want to propose. No need to DM amymore 😄 Yes, PhotoDNA for known data while multimodel setup using nude detection + age detection model for unknown data. It is also my proposal idea.

this is very good tip for #photoDNA or any selfhosted AI model @Quentin to integrate this foss software into nostrcheck package. (using external free/paid indexing or content searching means dependency on another 3rd party service i.e. BAD by design) - there is nohing gives 100% guarantee in cat n mouse game BUT MITIGATING 80% solves good part the problem. also look POW and/or NIP-42 also which limit attackers limit resource also.