> The main ledger and smart contracts should be separated, everyone smart contract is public, why??
You might find Blockstack interesting.
(I don’t have a connection. I’ve just started to explore this space, and have some of those same questions.)
[2] Jude, “What is the difference between blockstack and Ethereum?”, Blockstack forum, March ‘17. https://forum.blockstack.org/t/what-is-the-difference-betwee...
[3] Alid Castano, “What is the difference between Blockstack and Ethereum?”, Sept. 13 ‘17. https://www.quora.com/What-is-the-difference-between-Blockst...
[4] Alid Castano, “Why I’m betting on Blockstack to save the decentralized internet”, Sept. 12 ‘17. https://medium.com/@alidcastano/why-im-betting-on-blockstack...