reorg

A short reorg occurs when two valid blocks compete and the longer chain wins out.当两个有效区块竞争并且更长的链胜出时，就会发生短程链重组。

Frequent deep reorgs are a sign of serious network instability or an active 51% attack.频繁的深度链重组是网络严重不稳定或正在发生 51% 攻击的信号。