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authorBilly Tetrud <billy.tetrud@gmail.com>2022-05-10 10:31:17 -0500
committerbitcoindev <bitcoindev@gnusha.org>2022-05-10 15:31:36 +0000
commit825d81c82c3bb31e93bc353fd1537973d8caa2d4 (patch)
tree8c460d932b3196fb3621c6b6a39de477014a2c38 /f4
parentee3ba00c17b4f92cdc1080a3d2397a6d4691a3a0 (diff)
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Re: [bitcoin-dev] Improving BIP 8 soft fork activation
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+From: Billy Tetrud <billy.tetrud@gmail.com>
+Date: Tue, 10 May 2022 10:31:17 -0500
+Message-ID: <CAGpPWDbHUqf5_APr3e_hr7npo=ObJvLuWooJc5azMDCDOVSfOA@mail.gmail.com>
+To: alicexbt <alicexbt@protonmail.com>,
+ Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
+Content-Type: multipart/alternative; boundary="00000000000015f66f05deaa0558"
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+Subject: Re: [bitcoin-dev] Improving BIP 8 soft fork activation
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+--00000000000015f66f05deaa0558
+Content-Type: text/plain; charset="UTF-8"
+
+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
+>
+> Sent with ProtonMail <https://protonmail.com/> secure email.
+> _______________________________________________
+> bitcoin-dev mailing list
+> bitcoin-dev@lists.linuxfoundation.org
+> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
+>
+
+--00000000000015f66f05deaa0558
+Content-Type: text/html; charset="UTF-8"
+Content-Transfer-Encoding: quoted-printable
+
+<div dir=3D"ltr">I think this is a useful proposal. There are certainly thi=
+ngs about BIP9 that BIP8 fixes. I believe taproot&#39;s speedy=C2=A0trial d=
+id kind of a hybrid, but a BIP spec was never produced for it afaik. A poss=
+ibly unhelpful comment:<div><br></div>&gt; minimum_activation_height <div><=
+br></div>I think a minor improvement would be to specify this as minimum_ac=
+tivation_blocks, ie a number of blocks passed=C2=A0the start_height. Slight=
+ly easier to reason about and change when necessary. I proposed semantics l=
+ike that <a href=3D"https://github.com/fresheneesz/bip-trinary-version-sign=
+aling/blob/master/bip-trinary-version-bits.md" target=3D"_blank">here</a>.=
+=C2=A0<div><br></div><div>In any case, I&#39;ll give this a concept ACK. I =
+would very much like future soft forks to use a previously specified activa=
+tion mechanism rather than rolling out a rushed unspeced thing as part of t=
+he (very orthogonal) soft fork implementation.</div></div><br><div class=3D=
+"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, May 10, 2022 at=
+ 9:02 AM alicexbt via bitcoin-dev &lt;<a href=3D"mailto:bitcoin-dev@lists.l=
+inuxfoundation.org" target=3D"_blank">bitcoin-dev@lists.linuxfoundation.org=
+</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
+0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
+<div style=3D"font-family:arial;font-size:14px">Hi Bitcoin Developers,<br>
+<br>
+There were some disagreements with speedy trial activation method recently =
+and BIP 8 became controversial because of LOT earlier. I have tried to solv=
+e these two problems after reading some arguments for/against different act=
+ivation methods by removing LOT from BIP 8 and calculating MUST_SIGNAL stat=
+e based on threshold reached.<br>
+<br>
+BIP draft with no code and some changes in BIP 8:=C2=A0<a href=3D"https://g=
+ist.github.com/1440000bytes/5e58cad7ba9d9c1a7000d304920fe6f1" target=3D"_bl=
+ank">https://gist.github.com/1440000bytes/5e58cad7ba9d9c1a7000d304920fe6f1<=
+/a><br>
+<br>
+State transitions diagram:=C2=A0<a href=3D"https://i.imgur.com/dj4bFVK.png"=
+ target=3D"_blank">https://i.imgur.com/dj4bFVK.png</a><br>
+<br>
+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.<br>
+<br>
+MUST_SIGNAL =3D ((100-t)/10)*2016 blocks, where t is threshold reached and =
+blocks that fail to signal in MUST_SIGNAL phase are invalid.<br>
+<br>
+Example:=C2=A0<br>
+<br>
+- This activation method is used for a soft fork=C2=A0<br>
+- Only 60% miners signaled readiness and timeout height was reached<br>
+- MUST_SIGNAL phase starts and will last for 4*2016 blocks<br>
+- LOCKED_IN and ACTIVE states remain same as BIP 8<br>
+- Soft fork is activated with a delay of 2 months</div><div style=3D"font-f=
+amily:arial;font-size:14px"><br>
+<br>
+/dev/fd0<br><br>
+
+<div style=3D"font-family:arial;font-size:14px">
+ <div>
+
+ </div>
+
+ <div>
+ Sent with <a href=3D"https://protonmail.com/" rel=3D"noopener noref=
+errer" target=3D"_blank">ProtonMail</a> secure email.
+ </div>
+</div>
+</div>_______________________________________________<br>
+bitcoin-dev mailing list<br>
+<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
+bitcoin-dev@lists.linuxfoundation.org</a><br>
+<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
+rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
+man/listinfo/bitcoin-dev</a><br>
+</blockquote></div>
+
+--00000000000015f66f05deaa0558--
+