Difficulty of block 165000 is calculated incorrectly by the daemon and in the official bootstrap
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Seems that something wrong has happened with difficulty function around block 165000 (last HF).
When I re-sync blockchain from scratch, the difficulties of blocks are:
164999: 44927972711
165000: 35765249082
165001: 37416546319
When I load it from official bootstrap (https://blockchain.sumokoin.org/blockchain.raw), the difficulties are:
164999: 44927972711
165000: 35765249082
165001: 42069324103
Official pool reports:
164999: 44927972711
165000: 41223255770
165001: 42201075672
The only way I found to be consistent with pools is to cut the blockchain just before block 165000, manually specify this block difficulty in source code and then re-sync blockchain from that point. I don't think that it's how it should be, better to be fixed before it lead to chain split. I am using Ubuntu 16.04 server x64, just in case it depends on that.
Seems that the chain split did happen today (I'm not sure about the exact cause, it may be some other thing) - pool.sumokoin.com and sumo.hashvault.pro are on different chains. Cryptopia supports HashVault (in fact, most pools support HashVault, I did not find any supporting pool.sumokoin.com), not sure about TradeOgre. But better to have somebody who reads issues here in time before it comes too far.
Resolved