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by westurner 3069 days ago
Proof of Work (Bitcoin*, ...), Proof of Stake (Ethereum Casper), Proof of Space, Proof of Research (GridCoin, CureCoin,)

Plasma (Ethereum) and Lightning Network (BitCoin (SHA256), Litecoin (scrypt),) will likely offload a significant amount of transaction volume and thereby reduce the kWh/transaction metrics.