Find the top $5$ Bitcoin mining pools as of today. Report the following:

$($a$)$ The current block height.

$($b$)$ For each mining pool, search the internet and find its name, year founded $($and base country if known$),$ last block it mined, mining hash$-$rate and percentage $($for Bitcoin$).$ Organize your answer in a table.

$($c$)$ Draw a Pie$-$chart of these mining pools based on your findings to update the chart given in the slides.