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[109.224.244.121]) by gmr-mx.google.com with ESMTPS id 41be03b00d2f7-c73cdf324c6si78004a12.2.2026.03.11.08.02.31 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2026 08:02:31 -0700 (PDT) Received-SPF: pass (google.com: domain of darosior@protonmail.com designates 109.224.244.121 as permitted sender) client-ip=109.224.244.121; Date: Wed, 11 Mar 2026 15:02:21 +0000 To: Jameson Lopp From: "'Antoine Poinsot' via Bitcoin Development Mailing List" Cc: Bitcoin Development Mailing List Subject: Re: [bitcoindev] BIP 54 active on Bitcoin Inquisition Message-ID: <273ith9pPyipCI5hjV6ETFBzFhM4xFN8ptEFK8zc5N-jxGwOBvEn5r9Bt2c9p0A-6-3Bs53gONglzo1QfI4LCIOwkJgR9PWT4iQT_Wbpllo=@protonmail.com> In-Reply-To: References: Feedback-ID: 7060259:user:proton X-Pm-Message-ID: ea23e6250077725501af6c4aae46ba2f9cde82cb MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="b1=_qaJl535XGadyy1vK2I4SVcKygWxFdTgxo53jQBKe1VU" X-Original-Sender: darosior@protonmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@protonmail.com header.s=protonmail3 header.b=R+068gd9; spf=pass (google.com: domain of darosior@protonmail.com designates 109.224.244.121 as permitted sender) smtp.mailfrom=darosior@protonmail.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=protonmail.com X-Original-From: Antoine Poinsot Reply-To: Antoine Poinsot Precedence: list Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com List-ID: X-Google-Group-Id: 786775582512 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Score: -1.0 (-) --b1=_qaJl535XGadyy1vK2I4SVcKygWxFdTgxo53jQBKe1VU Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I share this concern, which is why i only shared details about this in the = (semi-)private Delving thread to this effect: https://delvingbitcoin.org/t/= worst-block-validation-time-inquiry/711. The testing for quality assurance has already been performed as part of the= investigation into the various techniques and possible mitigations. Additi= onal testing is always valuable, but the primary goal of a public demonstra= tion for this would be to help build consensus. It's a fine line to tread, because on the one hand you do not want to give = away the details of how to optimise the attack (whether for maximum profit = or for maximum impact), but on the other hand i do think it's necessary to = provide some amount of publicly verifiable information to support a soft fo= rk activation proposal. My approach so far has been to share all details in the semi-private Delvin= g thread that is accessible to a number of experts who would be able to fig= ure it out on their own anyway, and to share a demonstration of an expensiv= e-but-far-from-worst block publicly. This allows anyone to check for themse= lves that it is indeed possible to craft some=E2=80=8B slow blocks, and the= y can refer to an expert to confirm that it can be made much worse. Of cour= se, i remain open to feedback. On Wednesday, February 25th, 2026 at 12:03 PM, Jameson Lopp wrote: > The main concern I'd have is whether or not doing so would leak more info= rmation to the world about how to conduct such an attack on mainnet. It may= be prudent to perform such testing privately. > > On Fri, Feb 13, 2026 at 5:28=E2=80=AFPM 'Antoine Poinsot' via Bitcoin Dev= elopment Mailing List wrote: > >> Hi everyone, >> >> Bitcoin Inquisition 29.2 was released last week with support for BIP 54 = (Consensus Cleanup) [0]. BIP >> 54 is now active on Inquisition since block 291168. >> >> By virtue of being a bugfix soft fork rather than introducing new featur= es, there is fewer avenues >> for testing on the public Signet network. Perhaps we could create a Sign= et block that is slow but >> not quite as bad as the worst case, and share it here to demonstrate it = is now invalid on >> Inquisition? >> >> At any rate, please let us know if you find anything in testing whether = it is on the public Signet >> network, in private ones, or however else. >> >> Best, >> Antoine Poinsot >> >> [0] https://delvingbitcoin.org/t/bitcoin-inqusition-29-2/2236 >> >> -- >> You received this message because you are subscribed to the Google Group= s "Bitcoin Development Mailing List" group. >> To unsubscribe from this group and stop receiving emails from it, send a= n email to [bitcoindev+unsubscribe@googlegroups.com](mailto:bitcoindev%2Bun= subscribe@googlegroups.com). >> To view this discussion visit https://groups.google.com/d/msgid/bitcoind= ev/wJZkcSEOQD5Z8rsel8TJCSkUJiwn7YepjyOfSDHKt3P_4Fvh9MFu_oiva3G6C-Q_1CmRTCj6= lqmVm6ZeZG8WbdVrCo4IZUFg3VazRdJ48AQ%3D%40protonmail.com. > > -- > You received this message because you are subscribed to the Google Groups= "Bitcoin Development Mailing List" group. > To unsubscribe from this group and stop receiving emails from it, send an= email to bitcoindev+unsubscribe@googlegroups.com. > To view this discussion visit https://groups.google.com/d/msgid/bitcoinde= v/CADL_X_ewFMqLuv7MVfWCZf3QhKezW9xiS19xWdROjtoT9dmU7w%40mail.gmail.com. --=20 You received this message because you are subscribed to the Google Groups "= Bitcoin Development Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to bitcoindev+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/= 273ith9pPyipCI5hjV6ETFBzFhM4xFN8ptEFK8zc5N-jxGwOBvEn5r9Bt2c9p0A-6-3Bs53gONg= lzo1QfI4LCIOwkJgR9PWT4iQT_Wbpllo%3D%40protonmail.com. --b1=_qaJl535XGadyy1vK2I4SVcKygWxFdTgxo53jQBKe1VU Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I share thi= s concern, which is why i only shared details about this in the (semi-)priv= ate Delving thread to this effect: https://delvingbitcoin.org/t/worst-block-va= lidation-time-inquiry/711.

The testing for quality assurance has alread= y been performed as part of the investigation into the various techniques a= nd possible mitigations. Additional testing is always valuable, but the pri= mary goal of a public demonstration for this would be to help build consens= us.
It'= s a fine line to tread, because on the one hand you do not want to give awa= y the details of how to optimise the attack (whether for maximum profit or = for maximum impact), but on the other hand i do think it's necessary to pro= vide some amount of publicly verifiable information to support a soft fork = activation proposal.

My approach so far has been to share all details in the semi-= private Delving thread that is accessible to a number of experts who would = be able to figure it out on their own anyway, and to share a demonstration = of an expensive-but-far-from-worst block publicly. This allows anyone to ch= eck for themselves that it is indeed possible to craft some=E2=80=8B= slow blocks, and they can refer to an expert to confirm that it can be mad= e much worse. Of course, i remain open to feedback.
On Wednesday, February 25th, 2026 at 12:03 PM, Jameson Lopp <jam= eson.lopp@gmail.com> wrote:
The main concern I'd have is whether or not do= ing so would leak more information to the world about how to conduct such a= n attack on mainnet. It may be prudent to perform such testing privately.
On Fri, Feb 13, 2026 at 5:28=E2=80=AFPM 'Antoine Poinso= t' via Bitcoin Development Mailing List <bitcoindev@googlegroup= s.com> wrote:
Hi everyone,

Bitcoin Inquisition 29.2 was released last week with support for BIP 54 (Co= nsensus Cleanup) [0]. BIP
54 is now active on Inquisition since block 291168.

By virtue of being a bugfix soft fork rather than introducing new features,= there is fewer avenues
for testing on the public Signet network. Perhaps we could create a Signet = block that is slow but
not quite as bad as the worst case, and share it here to demonstrate it is = now invalid on
Inquisition?

At any rate, please let us know if you find anything in testing whether it = is on the public Signet
network, in private ones, or however else.

Best,
Antoine Poinsot

[0] https://delvingbitcoi= n.org/t/bitcoin-inqusition-29-2/2236

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