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From: Erik Aronesty <erik@q32.com>
Date: Tue, 18 May 2021 14:52:51 -0400
Message-ID: <CAJowKgJ3DOrtO+_XzoEnqQUQdge=zCopg2mvuy5F=RSeaVPJYQ@mail.gmail.com>
To: Zac Greenwood <zachgrw@gmail.com>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>,
 SatoshiSingh <SatoshiSingh@protonmail.com>
Subject: Re: [bitcoin-dev] Opinion on proof of stake in future
Precedence: list

1. i never suggested vdf's to replace pow.

2. my suggestion was specifically *in the context of* a working
proof-of-burn protocol

- vdfs used only for timing (not block height)
- blind-burned coins of a specific age used to replace proof of work
- the required "work" per block would simply be a competition to
acquire rewards, and so miners would have to burn coins, well in
advance, and hope that their burned coins got rewarded in some far
future
- the point of burned coins is to mimic, in every meaningful way, the
value gained from proof of work... without some of the security
drawbacks
- the miner risks losing all of his burned coins (like all miners risk
losing their work in each block)
- new burns can't be used
- old burns age out (like ASICs do)
- other requirements on burns might be needed to properly mirror the
properties of PoW and the incentives Bitcoin uses to mine honestly.

3. i do believe it is *possible* that a "burned coin + vdf system"
might be more secure in the long run, and that if the entire space
agreed that such an endeavor was worthwhile, a test net could be spun
up, and a hard-fork could be initiated.

4. i would never suggest such a thing unless i believed it was
possible that consensus was possible.  so no, this is not an "alt
coin"

On Tue, May 18, 2021 at 10:02 AM Zac Greenwood <zachgrw@gmail.com> wrote:
>
> Hi ZmnSCPxj,
>
> Please note that I am not suggesting VDFs as a means to save energy, but =
solely as a means to make the time between blocks more constant.
>
> Zac
>
>
> On Tue, 18 May 2021 at 12:42, ZmnSCPxj <ZmnSCPxj@protonmail.com> wrote:
>>
>> Good morning Zac,
>>
>> > VDFs might enable more constant block times, for instance by having a =
two-step PoW:
>> >
>> > 1. Use a VDF that takes say 9 minutes to resolve (VDF being subject to=
 difficulty adjustments similar to the as-is). As per the property of VDFs,=
 miners are able show proof of work.
>> >
>> > 2. Use current PoW mechanism with lower difficulty so finding a block =
takes 1 minute on average, again subject to as-is difficulty adjustments.
>> >
>> > As a result, variation in block times will be greatly reduced.
>>
>> As I understand it, another weakness of VDFs is that they are not inhere=
ntly progress-free (their sequential nature prevents that; they are inheren=
tly progress-requiring).
>>
>> Thus, a miner which focuses on improving the amount of energy that it ca=
n pump into the VDF circuitry (by overclocking and freezing the circuitry),=
 could potentially get into a winner-takes-all situation, possibly leading =
to even *worse* competition and even *more* energy consumption.
>> After all, if you can start mining 0.1s faster than the competition, tha=
t is a 0.1s advantage where *only you* can mine *in the entire world*.
>>
>> Regards,
>> ZmnSCPxj