SN-2489 已核对来源，附原文与上下文。
下一个 SVN 修订里，我会让它只回溯到区块 74000 的最后一个检查点。将来如果要再修问题，随时可以让它至少回溯到问题所在之处。另外，我正在加校验区块索引的代码，也就是说会对工作证明链做校验。
In the next SVN rev, I'll make it only go back to the last checkpoint at block 74000. If we need to correct a problem in the future, we can always make sure it goes back at least as far back as the problem. Also, I'm adding code to verify the block index, which means the proof-of-work chain is checked.
不过，系统对你的 blk*.dat 文件仍然不是完全安全的。用别人 blk 文件的副本，就是在信任那个人。
Still, the system won't be entirely secure against your blk*.dat files. You are trusting someone if you use a copy of their blk files.
