Can PoW be as energy efficient as PoS?

#1

Lots of discussion on Twitter recently regarding PoW vs PoS. People like Jack Dorsey from Twitter arguing that PoW vs PoS is not black vs white, for instance considering solar or places in the world where the price of energy is zero (like deserts or wind tunnels)

Here is one proposal on how PoW can be made as energy efficient as PoS.

  1. Energy consumption of chips comes mostly from transistor switches (a transistor is a capacitor, and energy per switch is $ C V^2/2$ where $V$ is voltage and $C$ is capacitance.

  2. Transistors essentially switch on each clock cycle, so if you need to have crypto algorithms that require fewer clock cycles and larger chip area. In this case, energy use will be small and costs of chip design and production will be large, so energy will be a small percentage of mining costs. In the extreme case, you have a huge chip with a very slow clock and a crypto algorithm requires such a chip to run efficiently.

  3. The question is, are there hardware people on this board that could help to design a chip/algorithm like that?

#2

I think specialized hardware isn’t the go-to if you don’t have any other incentive more than reaching consensus, thus you can’t depend on it to be efficient.

#3

Why?

Dont people use specialized hardware for GPUs?

#4

Yes, but GPUs aren’t result of looking for consensus.

#5

Supposing specialized hardware is the way to reach energy-efficient consensus, then it should be distributed for all users. Otherwise, this tends to become centralized like ASICs do.
To achieve that, I think it should be motivated for more reasons than reaching consensus, that’s philanthropic, but isn’t achievable.

For example, the AES instruction set IMHO is implemented not because Intel wants users to be secure, but to improve performance of a national standard implementation (therefore, their revenue).

So I think this approach leads to a energy-efficient ASICs, which is an improve to Bitcoin if it’s possible, but certainly isn’t that aligned with Ethereum’s goal.

From the yellow paper:

One plague of the Bitcoin world is ASICs […] Because of this, a proof-of-work func-
tion that is ASIC-resistant has been identified as the proverbial silver bullet.

#6

Well Sebastian -

I think many people will agree with you and many disagree.

ETH is becoming a way larger ecosystem than ETH yellow paper.
It just make sense to create things in compatible way even if they are different.

Many people experiment in whatever way they want and their goals are determined by their imagination.

I imagine what what Linux would turn into if Linus Torvalds would write a yellow paper for it and tell people to follow it.

Linux is just a collection of fun things that people designed. No one really policed them.

People will do the same to blockchain. It is unavoidable.

#7

I think PoW fueled by volcanoes is a pretty strong move in the ethereal sci-fi film that is our reality rn

also, Dorsey looked pretty cool on stage at the btc con in a flame colored tie dyed shirt. Bitcoin might be winning.

#8

Well :slight_smile:

I think blockchain community needs to adopt moderate mentality instead of separating in camps and fighting.

It is amazing how few people are willing to accept the fact that both PoW and PoS both have strong and weak sides.

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