Re:BitPay Will Process Payments on Multiple Blockchains, Sta...
by Frogolocalypse on Saturday December 16, 2017 @03:47AM
(#15938541)
Nodes don't mine. There are still many nodes using old client node software. Look.
http://luke.dashjr.org/programs/bitcoin/files/charts/softwar...
I don't think you really understand the relationship between nodes and consensus.
All full nodes had to upgrade or risk mining invalid blocks.