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The miners’ total energy consumption to secure the Bitcoin blockchain is significantly greater than what many smaller countries require for their yearly consumption. Energy is wasted on solving a useless puzzle in a brute-force manner to get the Bitcoin rewards. Computer scientists and researchers went through extensive research and designs in cryptocurrency field to come up with other solutions that did not require so much energy to secure the blockchain. Ethereum started off a Proof of Work blockchain. The founders and the community wanted to change the sybil resistance mechanism from proof of work to proof of stake so that energy consumption could be drastically redu