[flumpcakes]

It already exists. Most CSAM tools are checking against a hash database.

Why would you NOT want this to exist? This seems the only method to not raise false positives.

[izacus]

Let's delete it then.

Why? Because I don't want such pictures to be kept or archived by anyone. This isn't hard.

[HDBaseT]

I'm unsure how these databases work, although it could simply be a database of hashes, with the file contents deleted. That sounds like the sane, safe way to handle this.