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author'Antoine Poinsot' via Bitcoin Development Mailing List <bitcoindev@googlegroups.com>2025-03-18 14:29:35 +0000
committerbitcoindev <bitcoindev@googlegroups.com>2025-03-18 14:24:56 -0700
commit3f113898ab13144d7999a47f16c521255b0d1487 (patch)
treea905f76f0d0ffce8dad4420b601575bfacb85687
parentdbb629834a7b6eafcfaa51923e7b3e1f3df8fa4e (diff)
downloadpi-bitcoindev-3f113898ab13144d7999a47f16c521255b0d1487.tar.gz
pi-bitcoindev-3f113898ab13144d7999a47f16c521255b0d1487.zip
[bitcoindev] Unbreaking testnet4
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+Date: Tue, 18 Mar 2025 14:29:35 +0000
+To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
+From: "'Antoine Poinsot' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
+Subject: [bitcoindev] Unbreaking testnet4
+Message-ID: <hU75DurC5XToqizyA-vOKmVtmzd3uZGDKOyXuE_ogE6eQ8tPCrvX__S08fG_nrW5CjH6IUx7EPrq8KwM5KFy9ltbFBJZQCHR2ThoimRbMqU=@protonmail.com>
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+--b1=_AD2SSAXK8pVLN59xGh7g2lJd6Ub303qe8YSXys0pz9U
+Content-Type: text/plain; charset="UTF-8"
+Content-Transfer-Encoding: quoted-printable
+
+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, tes=
+tnet4 is similarly creating havoc. [2]
+
+The goal of testnet is to mimic the Bitcoin mainnet. This is why it is usef=
+ul to have in addition to a more control testing environment such as Signet=
+.
+
+The given rationale for a difficulty reset was to let developers occasional=
+ly mine blocks on their laptop. But you cannot have your cake and eat it to=
+o: 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 neit=
+her mimics mainnet nor allows developers to mine active blocks on their lap=
+top.
+
+I propose to fix this by removing the difficulty reset rule from testnet4 t=
+hrough a flag day hard fork on 2026-01-01. I picked a date well in the futu=
+re to minimize disruption. This leaves enough time for a patch to be review=
+ed, merged, included in the next major Bitcoin Core release, backported to =
+previous releases and adopted by the infrastructure running on testnet4. Th=
+at should be enough for a test network.
+
+Let me know what you think,
+Antoine
+
+[0] https://gnusha.org/pi/bitcoindev/CADL_X_eXjbRFROuJU0b336vPVy5Q2RJvhcx64=
+NSNPH-3fDCUfw@mail.gmail.com
+[1] https://github.com/bitcoin/bips/blob/master/bip-0094.mediawiki#rule-spe=
+cification
+[2] [https://fork.observer](https://fork.observer/) - pick the network on t=
+he top right corner
+
+--=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/=
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+
+--b1=_AD2SSAXK8pVLN59xGh7g2lJd6Ub303qe8YSXys0pz9U
+Content-Type: text/html; charset="UTF-8"
+Content-Transfer-Encoding: quoted-printable
+
+<div style=3D"font-family: Arial, sans-serif; font-size: 14px;"><div style=
+=3D"font-family: Arial, sans-serif; font-size: 14px;"><div>Hi,<br><br>Testn=
+et4
+ 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]<br><br>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.<br><br>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.<br><br>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.<br></div><div><br>Let me know what you think,<br=
+>Antoine<br><br>[0] <span><a href=3D"https://gnusha.org/pi/bitcoindev/CADL_=
+X_eXjbRFROuJU0b336vPVy5Q2RJvhcx64NSNPH-3fDCUfw@mail.gmail.com" rel=3D"noref=
+errer nofollow noopener" target=3D"_blank">https://gnusha.org/pi/bitcoindev=
+/CADL_X_eXjbRFROuJU0b336vPVy5Q2RJvhcx64NSNPH-3fDCUfw@mail.gmail.com</a></sp=
+an><br>[1] <span><a href=3D"https://github.com/bitcoin/bips/blob/master/bip=
+-0094.mediawiki#rule-specification" rel=3D"noreferrer nofollow noopener" ta=
+rget=3D"_blank">https://github.com/bitcoin/bips/blob/master/bip-0094.mediaw=
+iki#rule-specification</a></span><br>[2] <span><a href=3D"https://fork.obse=
+rver/" rel=3D"noreferrer nofollow noopener" target=3D"_blank">https://fork.=
+observer</a> - pick the network on the top right corner</span></div></div>
+<div class=3D"protonmail_signature_block protonmail_signature_block-empty" =
+style=3D"font-family: Arial, sans-serif; font-size: 14px;">
+ <div class=3D"protonmail_signature_block-user protonmail_signature_bloc=
+k-empty">
+ =20
+ </div>
+ =20
+ <div class=3D"protonmail_signature_block-proton protonmail_sign=
+ature_block-empty">
+ =20
+ </div>
+</div>
+</div>
+
+<p></p>
+
+-- <br />
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+
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