Each grouping of transactions is was a block and chained to the prevailing ledger. When a block is included it cannot be reversed or altered — which is why people explain blockchains as "immutable." 用户有一种安全的、内置保障机制，仅当用户表示同意后，资金才能够转手。同样，开发者可以确信相关规则将不会变化。 The shortage of the central authority can also make cryptocurrencies safer. "It... https://piersy062ujx4.tnpwiki.com/user