Re: [bitcoin-dev] Improving BIP 8 soft fork activation

From: Billy Tetrud <billy.tetrud@gmail•com>
To: alicexbt <alicexbt@protonmail•com>,
	 Bitcoin Protocol Discussion
	<bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Improving BIP 8 soft fork activation
Date: Tue, 10 May 2022 10:31:17 -0500	[thread overview]
Message-ID: <CAGpPWDbHUqf5_APr3e_hr7npo=ObJvLuWooJc5azMDCDOVSfOA@mail.gmail.com> (raw)
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I think this is a useful proposal. There are certainly things about BIP9
that BIP8 fixes. I believe taproot's speedy trial did kind of a hybrid, but
a BIP spec was never produced for it afaik. A possibly unhelpful comment:

> minimum_activation_height

I think a minor improvement would be to specify this as
minimum_activation_blocks, ie a number of blocks passed the start_height.
Slightly easier to reason about and change when necessary. I proposed
semantics like that here
<https://github.com/fresheneesz/bip-trinary-version-signaling/blob/master/bip-trinary-version-bits.md>
.

In any case, I'll give this a concept ACK. I would very much like future
soft forks to use a previously specified activation mechanism rather than
rolling out a rushed unspeced thing as part of the (very orthogonal) soft
fork implementation.

On Tue, May 10, 2022 at 9:02 AM alicexbt via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org> wrote:

> Hi Bitcoin Developers,
>
> There were some disagreements with speedy trial activation method recently
> and BIP 8 became controversial because of LOT earlier. I have tried to
> solve these two problems after reading some arguments for/against different
> activation methods by removing LOT from BIP 8 and calculating MUST_SIGNAL
> state based on threshold reached.
>
> BIP draft with no code and some changes in BIP 8:
> https://gist.github.com/1440000bytes/5e58cad7ba9d9c1a7000d304920fe6f1
>
> State transitions diagram: https://i.imgur.com/dj4bFVK.png
>
> This proposal removes lockinontimeout flag, activation never fails
> although MUST_SIGNAL can be longer if miners signaling does not reach the
> threshold. Longer period for MUST_SIGNAL state is useful for coordination
> if LOCKED_IN was not reached.
>
> MUST_SIGNAL = ((100-t)/10)*2016 blocks, where t is threshold reached and
> blocks that fail to signal in MUST_SIGNAL phase are invalid.
>
> Example:
>
> - This activation method is used for a soft fork
> - Only 60% miners signaled readiness and timeout height was reached
> - MUST_SIGNAL phase starts and will last for 4*2016 blocks
> - LOCKED_IN and ACTIVE states remain same as BIP 8
> - Soft fork is activated with a delay of 2 months
>
>
> /dev/fd0
>
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