>I dont care how my coins was moved 10 years ago. The only storage that is relevant for me, now, for value transfer is the current undisputed state

I don't have anything to add, but this has always struck me as inelegant, especially for Ethereum, which is more of a dApp platform. Can someone point me towards something that can run dApps and maintain current state with distributed consensus _without_ a blockchain (or explain why this is an ignorant question)? Also, what's wrong with truncating the chain after X blocks?