Powerledger

As good as a seastead sounds, the idea that anyone is cashing out here is lunacy. Blockchain is not a 'wank word', blockchain is a very real technology that removes the need for an intermediary to verify transactions - simply put, blockchain reduces costs associated with networking and markets and that is why it is perfect for energy trading.

There are lots of ways to deal with this. State channels for scaling or other techniques to reduce the bandwidth.

JB- Is your question - how do you prevent a smartcontract from being hacked?

JB - Yes just as an ERC20 token

Yes nodes will include application hosts