crypto

In March 2021, a digital image file sold at Christie's for $69.3 million. The buyer received no physical object and no copyright. What they received was an entry on a blockchain tying a unique token to their wallet address. That is what an NFT is, and it is more specific and more limited than the hype made it sound.

How Bitcoin mining uses proof of work to order transactions and secure the network, with clear coverage of halvings, difficulty, hardware, energy estimates and profitability uncertainty.