Fifty bitcoins are released when that block is done and the work, which involves solving a hard mathematical problem, is completed.

BBC: Rewards set to halve for digital money miners

Mining involves solving a hard mathematical problem and miners typically use large numbers of computers to speed up the number-crunching involved.

BBC: Bitcoin miners generating high energy bills

Mining involves solving a hard mathematical problem and miners typically use large numbers of computers to speed up the number crunching involved.

BBC: Bitcoin miners hit back at cyber-thieves