It was only a 10 minute talk, so I had to cut something out ;)

Blahah’s comment above may interest you:

https://news.ycombinator.com/item?id=15541392

Editing is easy, fwiw - content hashes are immutable and are not to be used for mutable content (obviously). That's why IPFS has IPNS - so we can have mutable pointers to data.