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[2607:f8b0:4864:20::102b]) by gmr-mx.google.com with ESMTPS id 41be03b00d2f7-af56e9d4908si557756a12.2.2025.03.18.14.34.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Mar 2025 14:34:37 -0700 (PDT) Received-SPF: pass (google.com: domain of melvincarvalho@gmail.com designates 2607:f8b0:4864:20::102b as permitted sender) client-ip=2607:f8b0:4864:20::102b; Received: by mail-pj1-x102b.google.com with SMTP id 98e67ed59e1d1-3011737dda0so5071319a91.1 for ; Tue, 18 Mar 2025 14:34:37 -0700 (PDT) X-Gm-Gg: ASbGncsjCSItO3ZCgQAc3ipNz4VM0F3z7zfDhUiQ8KvayYvmCe8FtDPFy8/sXZSE1io Tqb20ioc+3+WIwX1NKo6Q0bckAIzpRS3+LPyWn8eaQm+wp7cU7udjbyRMvW3ODLs7ulZcWzARUo 5CDZlqnSB+oNwHrgT0rD0KklfK X-Received: by 2002:a17:90b:4fc5:b0:2f8:4a3f:dd2d with SMTP id 98e67ed59e1d1-301bdf9364bmr371592a91.15.1742333676786; Tue, 18 Mar 2025 14:34:36 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Melvin Carvalho Date: Tue, 18 Mar 2025 22:34:25 +0100 X-Gm-Features: AQ5f1Jr79HnehpfFkUTQmpM1u06vBYnpCEnzrT0F4gmjEQefReH0eqCWmF5DS5M Message-ID: Subject: Re: [bitcoindev] Unbreaking testnet4 To: Antoine Poinsot Cc: Bitcoin Development Mailing List Content-Type: multipart/alternative; boundary="000000000000e29c600630a4abb8" X-Original-Sender: melvincarvalho@gmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=KLrQUfPq; spf=pass (google.com: domain of melvincarvalho@gmail.com designates 2607:f8b0:4864:20::102b as permitted sender) smtp.mailfrom=melvincarvalho@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com; dara=pass header.i=@googlegroups.com 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: -0.5 (/) --000000000000e29c600630a4abb8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =C3=BAt 18. 3. 2025 v 22:24 odes=C3=ADlatel 'Antoine Poinsot' via Bitcoin D= evelopment Mailing List napsal: > Hi, > > Testnet4 was rolled out a year ago to address the shortcomings of > testnet3. One of those shortcomings was the difficulty reset creating > havoc. [0] In spite of this a similar rule was adopted for testnet4. [1] = As > a result, testnet4 is similarly creating havoc. [2] > > The goal of testnet is to mimic the Bitcoin mainnet. This is why it is > useful to have in addition to a more control testing environment such as > Signet. > > The given rationale for a difficulty reset was to let developers > occasionally mine blocks on their laptop. But you cannot have your cake a= nd > eat it too: either the network is permissionless (PoW) or you assign > identities and privileges to some (Signet). By trying to do both at the > same time testnet4 created a loophole for abuse. As a result it failed on > both count: it neither mimics mainnet nor allows developers to mine activ= e > blocks on their laptop. > > I propose to fix this by removing the difficulty reset rule from testnet4 > through a flag day hard fork on 2026-01-01. I picked a date well in the > future to minimize disruption. This leaves enough time for a patch to be > reviewed, merged, included in the next major Bitcoin Core release, > backported to previous releases and adopted by the infrastructure running > on testnet4. That should be enough for a test network. > > Let me know what you think, > +1 I think this is a great idea. I can dedicate some resources to it, such as review, running a node, contributing some hash, if necessary, and a decentralized faucet (that anyone can run) that I've been working on > Antoine > > [0] > https://gnusha.org/pi/bitcoindev/CADL_X_eXjbRFROuJU0b336vPVy5Q2RJvhcx64NS= NPH-3fDCUfw@mail.gmail.com > [1] > https://github.com/bitcoin/bips/blob/master/bip-0094.mediawiki#rule-speci= fication > [2] https://fork.observer - pick the network on the top right corner > > -- > 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/hU75DurC5XToqizyA-vOKmVtmzd3= uZGDKOyXuE_ogE6eQ8tPCrvX__S08fG_nrW5CjH6IUx7EPrq8KwM5KFy9ltbFBJZQCHR2ThoimR= bMqU%3D%40protonmail.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/= CAKaEYhKwsLHfv0gYQYZ9MnDVPyQTN6jAfzShaKkS%3Dk2fDfMq0A%40mail.gmail.com. --000000000000e29c600630a4abb8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=C3=BAt 18. 3. = 2025 v=C2=A022:24 odes=C3=ADlatel 'Antoine Poinsot' via Bitcoin Dev= elopment Mailing List <bi= tcoindev@googlegroups.com> napsal:
H= i,

Testnet4 was rolled out a year ago to address the shortcomings of testnet3. One of those shortcomings was the difficulty reset creating havoc. [0] In=20 spite of this a similar rule was adopted for testnet4. [1] As a result,=20 testnet4 is similarly creating havoc. [2]

The goal of testnet is=20 to mimic the Bitcoin mainnet. This is why it is useful to have in=20 addition to a more control testing environment such as Signet.

The given rationale for a difficulty reset was to let developers=20 occasionally mine blocks on their laptop. But you cannot have your cake=20 and eat it too: either the network is permissionless (PoW) or you assign identities and privileges to some (Signet). By trying to do both at the same time testnet4 created a loophole for abuse. As a result it failed=20 on both count: it neither mimics mainnet nor allows developers to mine=20 active blocks on their laptop.

I propose to fix this by removing=20 the difficulty reset rule from testnet4 through a flag day hard fork on=20 2026-01-01. I picked a date well in the future to minimize disruption.=20 This leaves enough time for a patch to be reviewed, merged, included in=20 the next major Bitcoin Core release, backported to previous releases and adopted by the infrastructure running on testnet4. That should be=20 enough for a test network.

Let me know what you think,

+1 I think this is a gr= eat idea.=C2=A0 I can dedicate some resources to it, such as review, runnin= g a node, contributing some hash, if necessary, and a decentralized faucet = (that anyone can run) that I've been working on
=C2=A0
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">

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