I knew something happened at the end of 2017 to make the Bitcoin we have seen in 2018 "different" ... Never seen an empty block like this...

https://blockchain.info/block/0000000000000000004b27f9ee7ba33d6f048f684aaeb0eea4befd80f1701126

Ahh, that's an odd one.

Transaction fee of -12.5 BTC

State reorganization underway for BTC. F2Pool is the mining pool submitting blocks from the early 2000's.

Yeah.. 1999 now..

Anyways... I'm pretty sure I know or suspect what is going on, but don't really want to discuss attack details in public ;/