回复：严重的溢出错误
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看起来我们在 74689 附近超过了坏链。几个小时以来，0.3.9 及更低版本的节点都在用当前区块编号作出响应。
这意味着升级前不再需要删除 blk*.dat。直接升级即可，客户端会通过重组摆脱坏的区块链。
感谢大家迅速响应！
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It looks like we overtook the bad chain somewhere around 74689. 0.3.9 and lower nodes have been responding with the current block number for some hours now.
That means it's no longer necessary to delete blk*.dat before upgrading. You can just upgrade and it'll reorg away the bad block chain.
Thanks to everyone for the quick response!