A staggering amount of energy is used to power Bitcoin and Ethereum, the two largest blockchains. The energy required for a single transaction on Bitcoin is the equivalent of powering a two person household for three months.
See also:
- This comment which picks apart the argument that cost of transactions are the same as the banking industry if you factor in non-server costs
- Web3
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Cryptopunks Are the Star Wars Action Figures of the Future
A commonly cited success story of NFTs is CryptoPunks. They were 10,000 uniquely generated pixel art avatars released on the blockchain for free. They’ve since become a hugely sought after item with market prices greater than $7MM.