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It's nice that the IEEE is waking up to this fact in 2021. We've had POS, low-energy requirement for a while now.

Some POS chains like Avalanche have nodes that can run on little more than an RPI.

avalanche is nice. but it it is solidity. afaik solidity prevents scalability by assumption of global mutable data access in single transaction.

Solidity is only the language of the C-Chain, which is basically the EVM with better scalability but only constitutes one part of the ecosystem.

It is currently the most visible part because most of the protocol's features are still under development.

But the Avalanche protocol itself isn't tied to the EVM or Solidity, it is designed to let you run any customized blockchain.

More parallelizable execution environments can run on top of the EVM. That's what Fuel is building with its Ethereum-based Optimistic Rollup, with a goal of eventually making the UTXO model Turing Complete (Fuel v2.0):

https://docs.fuel.sh/v1.1.0/Future%20Roadmap/Planned%20Featu...

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