Yes, first link is to a 4 day old post on HN, which links out to another SFW writeup. The title of the article (AI-assisted fake porn are being used by people on Reddit for self-completion) is worth keeping off the monitor if you don't want someone to quickly scan the word 'porn' on your monitor, but there are no NSFW photos or content.

A blockchain in this case would just be a timestamping service, to prove the minimum time that elapsed since the image existed. That’s only useful if the time to create a fake is significantly more than the resolution of the chain - 10 minutes for bitcoin, 15 seconds for ethereum.

But that I only makes sense if you know ahead of time that the information will be valuable, and it only proves the age if there is sufficient hash power on the network, so a “private” blockchain would not be viable.

This network was trained using an adversarial approach. What that means is that a second network that does exactly what you say was used to train the first.

They kept training until they created images that could reliably fool the discriminator. A more powerful discriminator would just be used to create better fakes.

You cannot infer that the type of structure supporting the visible surface is a house, or part of one.