A decentralized system has to be secure, and proof-of-work (PoW) is the solution for Bitcoin to secure its digital asset. The more successful Bitcoin is, the more energy is required for PoW to secure the network. In other words, the reason that Bitcoin uses up so much more electricity than Dogecoin (DOGE), for example, is because BTC is much more secure than DOGE.
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Source: Cryptocurrency - investing.com
