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[109.224.244.122]) by gmr-mx.google.com with ESMTPS id 41be03b00d2f7-c739e190ba5si316368a12.7.2026.03.09.12.45.32 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2026 12:45:32 -0700 (PDT) Received-SPF: pass (google.com: domain of darosior@protonmail.com designates 109.224.244.122 as permitted sender) client-ip=109.224.244.122; Date: Mon, 09 Mar 2026 19:45:26 +0000 To: Bitcoin Development Mailing List From: "'Antoine Poinsot' via Bitcoin Development Mailing List" Cc: Matt Corallo Subject: Re: [bitcoindev] [BIP Draft] 24 bits for nVersion nonce space instead of 16 Message-ID: In-Reply-To: References: <6fa0cb45-37d6-4b41-9ff8-03730fd96d6e@mattcorallo.com> Feedback-ID: 7060259:user:proton X-Pm-Message-ID: 5492be8ad55b14d61b95d70986157a87f7514cfc MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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=dahJOpu1; spf=pass (google.com: domain of darosior@protonmail.com designates 109.224.244.122 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 (-) I took a shot at implementing this in https://github.com/bitcoin/bitcoin/pu= ll/34779. Would love to hear more feedback on the idea. On Friday, February 27th, 2026 at 11:39 AM, 'Antoine Poinsot' via Bitcoin D= evelopment Mailing List wrote: > Makes sense. >=20 > The current 16 bits in the header allow to serve fresh job to an ASIC onl= y once every second up to ~280TH/s. There are nowadays ASICs that are able = to perform more than 1PH/s[^0], and 8 more bits would extend that limit up = to 72PH/s without nTime rolling. >=20 > This leaves 5 bits available for concurrent deployments. With upgrades be= coming less frequent as Bitcoin matures, i think this is more than enough. >=20 >=20 > [^0]: https://shop.bitmain.com/product/detail?pid=3D00020250707194812615L= 4HTKEMY064E >=20 >=20 >=20 > On Thursday, February 26th, 2026 at 5:26 PM, Matt Corallo wrote: >=20 > > 
> >    BIP: ?
> >    Title: 24 nVersion bits for general purpose use
> >    Author: Matt Corallo 
> >    Status: Draft
> >    Type: Specification
> >    Created: 2026-02-26
> >    License: BSD-3-Clause
> >             CC0-1.0
> >    Replaces: 320
> >
> > > > =3D=3DAbstract=3D=3D > > > > 24 bits are reserved in the nVersion field as extra nonce space for min= ers, providing for additional > > hashrate with header-only mining without relying on rolling nTime more = often than once per second. > > > > =3D=3DMotivation=3D=3D > > > > BIP 320 defined 16 bits of nVersion as nonce space for additional nonce= space. It turns out that > > this isn't enough, as some devices have started using 7 bits from nTime= for extra nonce space (see > > https://github.com/stratum-mining/sv2-spec/discussions/187). Given ther= e's limited utility in 16 > > bits of nVersion space for signaling, instead here we offer 24 bits of = nVersion space as extra nonce > > space. > > > > =3D=3DSpecification=3D=3D > > > > 24 bits from the block header nVersion field, starting from 5 and endin= g at 28 inclusive > > (0x1fffffe0), are reserved for nonce use and removed from BIP8 and BIP9= specifications. A mask of > > 0xe000001f should be applied to nVersion bits so bits 5-28 inclusive wi= ll be ignored for soft-fork > > signalling and unknown soft-fork warnings. > > > > =3D=3DRationale=3D=3D > > > > Headers-only mining avoids mining devices (either ASICs or the firmware= ) from having to concern > > itself with the vast space of consensus logic (handling transactions, m= erkle trees, etc). It is > > widely deployed in ASICs, but requires a substantial number of jobs fed= across an entire device, > > keeping the ASIC controller busy. Providing additional nonce space for = the ASICs to roll without > > needing fresh work from the controller may simplify ASIC design somewha= t, and as been apparently > > adopted in some miners by using extra space in nTime as extra nonce spa= ce. Doing so in nVersion > > instead is preferable to using nTime. > > > > =3D=3DBackwards Compatibility=3D=3D > > > > Non-upgraded nodes will interpret the reserved bits of this proposal as= signals for soft forks, and > > may additionally activate the warning system for unknown soft forks. > > > > At the time of writing no known soft forks are pending using any of 24 = bits reserved in this BIP, > > and given that a non-trivial percentage of the hashrate is already mak= ing uses of those bits, > > future soft forks SHOULD NOT utilize those bits for activation signalli= ng. > > > > =3D=3DAcknowledgements=3D=3D > > > > Timo Hanke and Sergio Lerner for originally proposing 15-bit extra nNon= ce2. Btc Drak for writing BIP > > 320. > > > > =3D=3DChangelog=3D=3D > > > > =3D=3DCopyright=3D=3D > > > > This document is dual licensed as BSD 3-clause, and Creative Commons CC= 0 1.0 Universal. > > > > -- > > You received this message because you are subscribed to the Google Grou= ps "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/bitcoin= dev/6fa0cb45-37d6-4b41-9ff8-03730fd96d6e%40mattcorallo.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= email to bitcoindev+unsubscribe@googlegroups.com. > To view this discussion visit https://groups.google.com/d/msgid/bitcoinde= v/FKxOaQE-_vA0CFzybOBdtVaWZAk3vz--pv81SZ8KPkRUgMfFMNzUaJiEEOKO1j1Nn4wfSx2al= nWzCfxO2YVuPVYgxcH1nZFLDzgIlm2V_mI%3D%40protonmail.com. >=20 --=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/= twPAEFBEm-LQBZIj5MxU5eORzPcjoFMa_JhuAp5UP9doWlRx2t1S--Bug2DpXURR3jWXijLNIBB= -VTeDC6DLsnNjNxPa_rRQQBlXaXG8vSM%3D%40protonmail.com.