I replaced my bitcoind from v0.11.2 to v0.12.1. Then I found "UpdateTip: 6 of last 100 blocks have unexpected version" in debug.log. This error occurs at new block generation. Can I ignore this? If not, how can I fix it?

I downloaded the new bitcond from

https://github.com/btcdrak/bitcoin/releases https://github.com/btcdrak/bitcoin/releases/download/v0.12.1-addrindex/bitcoin-0.12.1-addrindex-linux64.tar.gz

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    I'm still getting this on bitcoin core 0.17.1 --- and YES you can just ignore it. "warning='28 of last 100 blocks have unexpected version'" – Patoshi パトシ Jan 3 '19 at 18:30
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    I'm seeing "warning='39 of last 100 blocks have unexpected version'". Is that still OK? At what point it's not ok? – Aleksandr Levchuk Mar 9 '19 at 21:02

Yes. You can ignore this.

This means that some miners have mined (still compatible) blocks with a version number unknown to Bitcoin Core.

Generally this indicates that some miners have mined blocks that signal non Bitcoin Core compatible soft- or hard-forks. Very likely a 2MB hardfork after BIP109 implemented by Bitcoin Classic.

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    beside ignoring it, can we do something to remove it? ..or i bet it will go away as more block are added to the chain? Got 1 of last 100 about 2 years later than your answer.. and still relevant – Louis Loudog Trottier Aug 11 '18 at 0:34
  • "BIP109 implemented by Bitcoin Classic" What's "Bitcoin Classic"? – Aleksandr Levchuk Jun 25 '19 at 14:58

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