I think you need to hard deprecate the PoW for this to work, otherwise all
old miners are like "toxic waste".

Imagine one miner turns on a S9 and then ramps up difficulty for everyone
else.

On Fri, Apr 16, 2021, 2:08 PM Erik Aronesty via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Not sure of the best place to workshop ideas, so please take this with
> a grain of salt.
>
> Starting with 3 assumptions:
>
> - assume that there exists a proof-of-burn that, for Bitcoin's
> purposes, accurately-enough models the investment in and development
> of ASICs to maintain miner incentive.
> - assume the resulting timing problem "how much burn is enough to keep
> blocks 10 minutes apart and what does that even mean"  is also...
> perfectly solvable
> - assume "everyone unanimously loves this idea"
>
> The transition *could* look like this:
>
>  - validating nodes begin to require proof-of-burn, in addition to
> proof-of-work (soft fork)
>  - the extra expense makes it more expensive for miners, so POW slowly
> drops
>  - on a predefined schedule, POB required is increased to 100% of the
> "required work" to mine
>
> Given all of that, am I correct in thinking that a hard fork would not
> be necessary?
>
> IE: We could transition to another "required proof" - such as a
> quantum POW or a POB (above) or something else ....  in a back-compat
> way (existing nodes not aware of the rules would continue to
> validate).
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