The following is a comparison between the existing implementation in the
blockchain/standalone module with big integers (old) and the new
implementation (new) averaging 10 runs each:
name old time/op new time/op delta
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CalcWork 638ns ± 1% 59ns ± 1% -90.78% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
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CalcWork 7.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10)
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