Quote from: maaku on June 20, 2014, 06:59:36 AM

I explained myself, twice:

Quote from: maaku on June 19, 2014, 04:27:18 AM

The miner needs to verify the entire block chain history because otherwise he has no way of knowing if he is actually on a valid chain or not. This has nothing to do with UTXO commitments, rolling root, or any other proposal. It's a basic, fundamental requirement of any consensus system: if the miners themselves operate in SPV mode (which you advocate), then anyone -- no matter their hashrate! -- can trick the network into mining an invalid chain. The attacker does so by mining a fork with invalid history and temporarily (by luck or 51%) overcoming the honest network. New miners coming online, or miners tricked into reseting their state then switch to the invalid chain This completely invalidates the SPV assumption and makes it unsafe for anybody to use the network.

In what universe is that an answer to the facts that I pointed out?

You're continuing to ignore that:

1. I did not advocate SPV.
2. UTXO is not SPV.
3. Rolling root is not SPV.

The 51% attack you describe would have *equal* impact on nodes with the full history (so far as I understood what you're describing).

You never explainedanywherehow UTXO "full-leaf nodes" are different in any meaningful manner from nodes with complete transaction histories.

Still waiting for that reply.