I don't know and I am not that interested.
Zcash is a US/Israel intelligence project.
Up until recently they had a mining pool do 75% of the mining. Only when Monero community called them out when ...
I understand your disinterest in some specifics, yet these concerns about influence and control are important. Bitcoin's transparent, open-source nature and decentralised mining are specifically designed to resist such opaque agendas.
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