Each grouping of transactions is changed into a block and chained to the present ledger. As soon as a block is added it can't be reversed or altered — which is why people today explain blockchains as "immutable." 区块链是一个交易数据库，在网络上多台电脑之间更新和共享。每次添加一组新交易时，就称其为“区块”，这也是区块链名称的由来。以太坊这样的公开区块链，允许任何人添加数据，但不能删除数... https://wavesocialmedia.com/story3185205/not-known-facts-about-demand-for-eth