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[109.224.244.26]) by gmr-mx.google.com with ESMTPS id 46e09a7af769-7cfdf264e95si290813a34.6.2026.01.18.09.26.49 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Jan 2026 09:26:49 -0800 (PST) Received-SPF: pass (google.com: domain of bymet4@protonmail.com designates 109.224.244.26 as permitted sender) client-ip=109.224.244.26; Date: Sun, 18 Jan 2026 17:26:44 +0000 To: "bitcoindev@googlegroups.com" From: "'Angelo' via Bitcoin Development Mailing List" Subject: [bitcoindev] Re: [bitcoin-dev] Unbreaking testnet4 Message-ID: <85djL2Ah0Mh9Appt934138jLRE23gGmaIr96y8q-clEmMa_APPZLerKrrUZN524_Diq4pOydQLaEOZ3XBy4-sQIPxYODOHreM5RWuNHILto=@protonmail.com> Feedback-ID: 45585361:user:proton X-Pm-Message-ID: 6e3ab9a90b21482e962ec19b0b3c77620dfad4d6 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="b1=_oJzIgznEwGuvaWWftV0KeJWm1HzlZKm49qRNx9IV78s" X-Original-Sender: bymet4@protonmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@protonmail.com header.s=protonmail3 header.b=zGfJA6aG; spf=pass (google.com: domain of bymet4@protonmail.com designates 109.224.244.26 as permitted sender) smtp.mailfrom=bymet4@protonmail.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=protonmail.com X-Original-From: Angelo Reply-To: Angelo 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: -0.7 (/) --b1=_oJzIgznEwGuvaWWftV0KeJWm1HzlZKm49qRNx9IV78s Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello mailing list. I have forked Bitcoin Core and modified the code to fix testnet4 by disabli= ng the min difficulty rule after block 150,000: https://github.com/bitcoin/= bitcoin/compare/master...batmanbytes:bitcoin:testnet4-fix The changes in the code are minimal. As I've written in [Bitcointalk](https= ://bitcointalk.org/index.php?topic=3D5569103.msg66301279#msg66301279): > I have introduced int nMinDifficultyBlocksForkHeight which is 0 by defaul= t in consensus/params.h, only ever used by the CTestNet4Params class. GetNe= xtWorkRequired and PermittedDifficultyTransition are also modified to check= whether min difficulty blocks are enabled, and if yes, whether nMinDifficu= ltyBlocksForkHeight is 0 (which would indicate it is not testnet4). With no other changes to the code, during the epoch that includes block 150= ,000 (which already began at block 149,184), we should expect the block int= erval to increase by roughly sixfold (to about one hour per block). This is= because the effective hashrate would correspond to approximately one-sixth= of the difficulty. The difficulty increases by about 6x since there are ro= ughly six times more difficulty-1 blocks than blocks at the normal difficul= ty. We could modify the code to not suffer from the temporary 1-hour block inte= rval if needed. I'm just interested to see what you think of those changes,= so that we can move forward. --=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/= 85djL2Ah0Mh9Appt934138jLRE23gGmaIr96y8q-clEmMa_APPZLerKrrUZN524_Diq4pOydQLa= EOZ3XBy4-sQIPxYODOHreM5RWuNHILto%3D%40protonmail.com. --b1=_oJzIgznEwGuvaWWftV0KeJWm1HzlZKm49qRNx9IV78s Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello mailing list.

I have forked Bitcoin Core and modified the co= de to fix testnet4 by disabling the min difficulty rule after block 150,000= : https://github.com/bitcoin/bitcoin/compare/master...batmanby= tes:bitcoin:testnet4-fix

The= changes in the code are minimal. As I've written in Bitcointalk:
bitcoind= ev+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/= 85djL2Ah0Mh9Appt934138jLRE23gGmaIr96y8q-clEmMa_APPZLerKrrUZN524_Diq4pOydQLa= EOZ3XBy4-sQIPxYODOHreM5RWuNHILto%3D%40protonmail.com.
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