Blockchain hacked. Once hailed as unhackable, blockchains are now getting hacked. That was the headline of an article by Mike Orcutt that was published on MIT Technology Review online, on February 19th, 2019. Here is an extract from the article: “Early last month [January – Editor], the security team at Coinbase noticed something strange going on in Ethereum Classic, one of the cryptocurrencies people can buy and sell using Coinbase’s popular exchange platform. Its blockchain, the history of all its transactions, was under attack. An attacker had somehow gained control of more than half of the network’s computing power and was…