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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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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.
"BIP109 implemented by Bitcoin Classic"
What's "Bitcoin Classic"? – Aleksandr Levchuk – 2019-06-25T14:58:55.610
1beside 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 – 2018-08-11T00:34:15.217
2I'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 – 2019-01-03T18:30:19.317
1I'm seeing "warning='39 of last 100 blocks have unexpected version'". Is that still OK?
At what point it's not ok? – Aleksandr Levchuk – 2019-03-09T21:02:24.493