Is C32 Grin's final PoW update?

Not quite correct. Grin’s Pow since the last hardfork is Cuckatoo32+.

That means that it accepts all of C32, C33, C34, … up to C63.
But of course C32 is the preferred choice since C33+ puts much higher demands on mining hardware and software, and we may never see ASICs supporting C33…

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