Hmmm, that sure fits some evidence, but can a clock on a computer really do that?
The evidence of a large miner entering is certainly true, as the difficulty quickly grew at that point.
I saw that too sampei, very strange.
There was two actually -- one happened after that as well.
Have you seen it since?
Yes I noticed, for istance, blocks # 2959473, 2959470, 2959467, 2959446, 2959438, 2959431, 2959430, 2959428
It started on 2019-06-03 03:25:28 UTC
If you go to
https://www2.bytestamp.net/blocks/index and put
2959281 into
Starting block for list: Textbox, you can see that blocks #2959276 and #2959277 were mined at 2019-06-03 04:04:02 UTC,
before block #2959278 (2019-06-03 03:29:17 UTC)
Now it is stabilized
Maybe someone with great hash power was start mining, and this someone should have system clock not properly set?