All that is really needed is to pack transactions and sign blocks (this is problematic right now because there is no incentive to actually include transactions in blocks)
Good point! And overall good ideas!
The price feed is potentially problematic. I don't think that is really solvable without reputation.
Price feed could maybe work with a cluster of connections to other witness price feeds that only allow xyz % difference. Otherwise, price feed becomes invalid.
like "get price" + " compare price".
If a block has an invalid price, it becomes the price (calculation) from the block after ( or before).
I mean that could work as long not all anons go full retard :D