Blockchain因历史原因，其pow，pos需要矿工参与，导致费用和性能都很大的问题，如bitcoin要15分钟写一次数据，ethereum需要10-15秒，这些跟目前的互联网应用都性能很差。而且每笔交易还需要gas。
https://www.swirlds.com/developer-resources/faq/
What is Hashgraph? How is it different from Blockchain?
http://www.thewindowsclub.com/what-is-hashgraph
Hashgraph vs. Blockchain Is the end of Bitcoin and Ethereum near?、https://coincodex.com/article/1151/hashgraph-vs-blockchain-is-the-end-of-bitcoin-and-ethereum-near/?from=singlemessage&isappinstalled=0
