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[172.104.61.193]) by gmr-mx.google.com with ESMTPS id 71dfb90a1353d-56d58a5f316si54620e0c.7.2026.03.28.04.58.17 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Mar 2026 04:58:17 -0700 (PDT) Received-SPF: pass (google.com: domain of aj@erisian.com.au designates 172.104.61.193 as permitted sender) client-ip=172.104.61.193; Received: from aj@azure.erisian.com.au by cerulean.erisian.com.au with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1w6SIe-00080B-1g; Sat, 28 Mar 2026 21:58:12 +1000 Received: by email (sSMTP sendmail emulation); Sat, 28 Mar 2026 21:58:07 +1000 Date: Sat, 28 Mar 2026 21:58:07 +1000 From: Anthony Towns To: Matt Corallo Cc: Bitcoin Development Mailing List Subject: Re: [bitcoindev] [BIP Draft] 24 bits for nVersion nonce space instead of 16 Message-ID: References: <6fa0cb45-37d6-4b41-9ff8-03730fd96d6e@mattcorallo.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline In-Reply-To: <6fa0cb45-37d6-4b41-9ff8-03730fd96d6e@mattcorallo.com> X-Spam_score: 0.0 X-Spam_bar: / X-Original-Sender: aj@erisian.com.au X-Original-Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of aj@erisian.com.au designates 172.104.61.193 as permitted sender) smtp.mailfrom=aj@erisian.com.au 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: -0.8 (/) On Thu, Feb 26, 2026 at 05:12:03PM -0500, Matt Corallo wrote: > ==Specification== > 24 bits from the block header nVersion field, starting from 5 and ending 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 will be ignored for soft-fork signalling and > unknown soft-fork warnings. This conflicts with the proposed use of bit 5 for signalling CTV activation over the next twelve months mentioned at: * https://groups.google.com/g/bitcoindev/c/HC2bn4QOR-M/m/TF8qJidzAAAJ * https://delvingbitcoin.org/t/bip-119-ctv-activation-client/2242 * https://github.com/ctv-activation/activation-client/blob/06ddbdf01bc8ce181b01c7497010bff74c2b79c6/src/kernel/chainparams.cpp#L121-L127 I don't think there's any meaningful support for that activation proposal, but thought it was worth pointing out for completeness. BIP110 is currently signalling via bit 4 until block 963648; LNHANCE is possibly signalling on bit 3 between May last year and Jan 2028. Previously, CSV signalled on bit 0, segwit on bit 1, segwit reduced threshold (bip 91) on bit 4, and taproot on bit 2. Cheers, aj -- 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/bitcoindev/acfCTzCqIalFuOdi%40erisian.com.au.