I haven’t evaluated and run the code for these 8 cryptocurrencies but the most energy efficient cryptocurrencies with the highest market caps are:
Stellar Lumens & Ripple: More centralized but that centralization means there no no wasteful proof of work needed
Tezos: like a cheaper version of Ethereum for NFTs. Already powered by proof of stake.
Polkadot: Many new coins are beginning to be released on polkadot’s proof of stake network just as they are on Ethereum’s network.
Binance coin- centralized and proof of stake. The whole Binance Smart Chain network is powered by just 21 nodes (validates) that stake about 3.5M of Binance coin.
Cardano - has a cool name and is powered by proof of stake. Has lots of PHD research papers but most of which are over my head.
Algorand- a fast and cheap new cryptocurrency that is powered by two different kinds of validator nodes, one centralized and the other decentralized.
Ethereum 2.0 - will probably take 2-3 years to migrate to proof of stake but once it does, it’s possible that many of the above cryptocurrencies will be rendered obsolete unless they’ve captured large amounts of the market before then.
All 8 of these coins/tokens should meet your standards of being efficient on all levels. When evaluating cryptocurrencies you’ll notice this pattern. The cryptocurrencies with the cheapest transaction fees tend to use the least amount of energy.
Stellar Lumens & Ripple: More centralized but that centralization means there no no wasteful proof of work needed
Tezos: like a cheaper version of Ethereum for NFTs. Already powered by proof of stake.
Polkadot: Many new coins are beginning to be released on polkadot’s proof of stake network just as they are on Ethereum’s network.
Binance coin- centralized and proof of stake. The whole Binance Smart Chain network is powered by just 21 nodes (validates) that stake about 3.5M of Binance coin.
Cardano - has a cool name and is powered by proof of stake. Has lots of PHD research papers but most of which are over my head.
Algorand- a fast and cheap new cryptocurrency that is powered by two different kinds of validator nodes, one centralized and the other decentralized.
Ethereum 2.0 - will probably take 2-3 years to migrate to proof of stake but once it does, it’s possible that many of the above cryptocurrencies will be rendered obsolete unless they’ve captured large amounts of the market before then.
All 8 of these coins/tokens should meet your standards of being efficient on all levels. When evaluating cryptocurrencies you’ll notice this pattern. The cryptocurrencies with the cheapest transaction fees tend to use the least amount of energy.