Mining with school electricity seems to be quite common in mainland China.
An employee at a high school in Massachusetts was found secretly mining Bitcoin in a small space in the school basement, using the school's electricity. The police discovered a refrigeration unit filled with computers, and it is estimated that before the power was cut off, they consumed about $17,500 worth of electricity.
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This is a map of the Bitcoin public network. Each dot represents a computer (node) that holds a complete copy of the blockchain and verifies transactions.
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