@vbuterin, what about including a Bitcoin-NG style approach in the roadmap (e.g. phase 5 or 6)? Blocks are distinguished validating consensus blocks and non-consensus transaction micro-blocks. Additional features include:
- a poison transaction in each microblock pointing to the header of the first block in the pruned branch as a proof of fraud, accompanied with a maturity window for the reward, within which the poison transaction must be placed on the blockchain; and
- rewards split by ~40% for the miner/proposer of a leader block followed by micro-blocks and 60% to the leader of the next block).
I’m not sure if this can be used with Casper, however.
But maybe with this proposal it is not necessary or it would be more prone to adaptive adversaries.