A proposal to implement IPNS on Blockchain with Memento support to make IPFS a first-class distributed web archiving engine. Please open issue tickets in the repo for feedback and discussion.
is this just idea-stage or have you written some code for it?
Could just be stored on the ethereum blockchain as well?
Currently, it is in the idea stage. I did consider smart contracts to utilize Ethereum, but the application has some unique requirements such as frequent and fast name resolutions and retrieval of all the transaction of a given URI that might suffer when buried in a generic Blockchain. However, my experience with Ethereum platform is limited, so I can’t comment about the feasibility in it with confidence.