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[109.224.244.123]) by gmr-mx.google.com with ESMTPS id a1e0cc1a2514c-963abde1badsi470236241.4.2026.06.02.09.37.54 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2026 09:37:54 -0700 (PDT) Received-SPF: pass (google.com: domain of polespinasa@protonmail.com designates 109.224.244.123 as permitted sender) client-ip=109.224.244.123; Date: Tue, 02 Jun 2026 16:37:46 +0000 To: Saint Wenhao From: "'Pol Espinasa' via Bitcoin Development Mailing List" Cc: "bitcoindev@googlegroups.com" Subject: Re: [bitcoindev] [BIP Draft] Testnet 5 Message-ID: In-Reply-To: References: Feedback-ID: 138051716:user:proton X-Pm-Message-ID: c6c404d8e7a4129995b4c10f090c2b5fefdbc2f7 MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg=pgp-sha512; boundary="------295407689d91252ad66230c3f2ee98051bd112624270af35bfa809ef55ca64cd"; charset=utf-8 X-Original-Sender: polespinasa@protonmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@protonmail.com header.s=protonmail3 header.b=peZVbH7M; spf=pass (google.com: domain of polespinasa@protonmail.com designates 109.224.244.123 as permitted sender) smtp.mailfrom=polespinasa@protonmail.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=protonmail.com X-Original-From: Pol Espinasa Reply-To: Pol Espinasa 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 (-) This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------295407689d91252ad66230c3f2ee98051bd112624270af35bfa809ef55ca64cd Content-Type: multipart/mixed;boundary=---------------------0151065e8ea2c5c27593d4a2ced44e38 -----------------------0151065e8ea2c5c27593d4a2ced44e38 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Hi, On Tuesday, June 2nd, 2026 at 5:02 PM, Saint Wenhao = wrote: > > I am sharing a BIP draft for a new Testnet5. > > Interesting. Does it mean, that testnet4 fixes won't be done? https://bat= manbytes.github.io/testnet4-softfork/ They won't (or at least it is not what we are proposing here), I agree with= Antoine that a fresh start is better than just pile up workarounds. Sometimes the cure is worse than the disease. > > For the Pubkey field, use a recent Bitcoin mainnet block hash. > > Do you mean taking the hash of the block, and using it as x-value for a p= ublic key? Then, it could be potentially spendable, if it would be a valid = secp256k1 point, and people would send more coins to it, or unspendable, if= it would be outside of the curve. For example: > > spendable: 0200000000000000000001799c6f72ebe5ebc6b18fd5cdf8bd3697b8d73d01= b084 OP_CHECKSIG > unspendable: 02000000000000000000013ac2955a2b6029bc1a86ab4b19e01e8030ceb0= eeb2ae OP_CHECKSIG > unspendable: 00000000000000000001799c6f72ebe5ebc6b18fd5cdf8bd3697b8d73d01= b084 OP_CHECKSIG > > Also, if the size of the stack push would be different than 33 or 65 byte= s, then it would be unspendable (for example if it would take 32 bytes, lik= e block hashes, and would be followed by OP_CHECKSIG, to invalidate it, or = if it would start with OP_RETURN). yes, as per the original text in the draft: "the output is provably unspend= able". The idea comes from: https://github.com/bitcoin/bitcoin/pull/29775#i= ssuecomment-2093516015, https://github.com/bitcoin/bitcoin/pull/29775#issue= comment-2095786951, https://github.com/bitcoin/bitcoin/pull/29775#issuecomm= ent-2099974737 > > Difficulty: 0x1d00ffff > > I wonder, how quickly it would be listed on exchanges, and traded. Becaus= e historically, new testnets were launched, when that happened. But today, = new coins are listed faster, than they are replaced. Which would give the c= reator with any ASIC an incentive, to mine initial 30k or so blocks, keep t= hem for a while, and then sell for BTCs, when the coin will be listed. That is a risk, but I personally don't think there is any real solution for= that. It is impossible to avoid people selling coins. I hope the risk of resetting the network or starting a new one (as we did m= ultiple times, and we are suggesting here) is enough for coins to not have = "much" value. > Also, I wonder if testnet5 will have any premine. Previous attempt to cre= ate testnet5: https://bitcointalk.org/index.php?topic=3D5543921 It will not, using a mainnnet block hash in the Pubkey field acts as an ant= i-premine-commitment. > > Testnet 5 also does not apply the difficulty exception rule from Testne= t 3 or Testnet 4 requires. > > It would be nice to simplify the code, and remove that rule completely fr= om sources, but it would probably take a while to deprecate testnet3 and te= stnet4. I agree that might take time, but that is a node client implementation deta= il :) > wt., 2 cze 2026 o 13:27 'Pol Espinasa' via Bitcoin Development Mailing Li= st napisa=C5=82(a): > > > Dear list, > > I am sharing a BIP draft for a new Testnet5. > > People are complaining about Testnet4 being difficult to use, the new t= estnet also works as a miner playground for BIP54, we are killing two birds= with one stone. > > > > You can find the full text to read and comment on in the following draf= t PR: https://github.com/fjahr/bips/pull/2 > > Feel free to leave inline comments there or respond here on the list. > > > > > > > > > > Pol > > > > -- > > 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/BrgqDZiNhpEz32-Z9ZX2rrPDE9EUIb62SKT2WsTo-yZtd3gLMLVk6TkO6kLIR96-87TumXq= i92l_m1j3xlJr1tcJwG_I3UVDk2NZgXZL8fw%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/= FJTfAMGEfN5PH0phIMiQ--jMyFCzpSHQpZb8eg8ZMVKFqTMZtzjYrPz2qB6HIvAl81ZSuMCH88i= 3_B_vYcCmhmi8laRxbgOtFEBh0h24GK8%3D%40protonmail.com. -----------------------0151065e8ea2c5c27593d4a2ced44e38 Content-Type: application/pgp-keys; filename="publickey - polespinasa@protonmail.com - 0x44205759.asc"; name="publickey - polespinasa@protonmail.com - 0x44205759.asc" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="publickey - polespinasa@protonmail.com - 0x44205759.asc"; name="publickey - polespinasa@protonmail.com - 0x44205759.asc" LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgp4ak1FWjkwKzlCWUpLd1lCQkFI YVJ3OEJBUWRBTmtLQlBRUFFRUGhnWWh4NTJTMnk1WXVxUVFEbGJJczUKdlQxSEtsQUVtN25OTjNC dmJHVnpjR2x1WVhOaFFIQnliM1J2Ym0xaGFXd3VZMjl0SUR4d2IyeGxjM0JwCmJtRnpZVUJ3Y205 MGIyNXRZV2xzTG1OdmJUN0N3QkVFRXhZS0FJTUZnbWZkUHZRREN3a0hDWkJJNVhNaQpUUGNDTEVV VUFBQUFBQUFjQUNCellXeDBRRzV2ZEdGMGFXOXVjeTV2Y0dWdWNHZHdhbk11YjNKblBSSG8KVUFN VldJVnZKZkU2K29CUDZpUFdyODNwNFhNZkE3WUhTMnpPdTZvREZRb0lCQllBQWdFQ0dRRUNtd01D CkhnRVdJUVJFSUZkWjZDVWsybTlqblVwSTVYTWlUUGNDTEFBQVF4VUEvMmVGQ2dIOUx5YW1kSzNp TW1RQgo4REM5M3BYa09YcU9pY1o0bzZLelNQMVNBUURIVzFUR0lOaHJoYWw4dmkxd29PTVFNMTBF bzRMWGlVVXoKT3psZ2xqcFhCTTQ0QkdmZFB2UVNDaXNHQVFRQmwxVUJCUUVCQjBEaURWUDJ3MHBZ YjFZemRaMmVvdlZSCmJyQlNTODRaU3NWVXdwcEFBSkV6Q0FNQkNBZkN2Z1FZRmdvQWNBV0NaOTAr OUFtUVNPVnpJa3ozQWl4RgpGQUFBQUFBQUhBQWdjMkZzZEVCdWIzUmhkR2x2Ym5NdWIzQmxibkJu Y0dwekxtOXlaN3JuMzZMcVg0ZVEKZFRiREdpcGUzVURLNU5Nc0hJZklremRUaFVUNytkenhBcHNN RmlFRVJDQlhXZWdsSk5wdlk1MUtTT1Z6CklrejNBaXdBQUYrYUFQd0ovNGFEN1VDemRFa3lyVUky bU1PbFNOVkJMcWRwZWNSZkVxS0dELy9rQkFELwpjR29La0NjK3k3V0dCbVJ4aTlzNzg2cjZndEY4 T0NxakEveXJqVFNqNmdzPQo9ZmpmVgotLS0tLUVORCBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0t Cg== -----------------------0151065e8ea2c5c27593d4a2ced44e38-- --------295407689d91252ad66230c3f2ee98051bd112624270af35bfa809ef55ca64cd Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: ProtonMail wrsEARYKAG0FgmofBswJEEjlcyJM9wIsRRQAAAAAABwAIHNhbHRAbm90YXRp b25zLm9wZW5wZ3Bqcy5vcmcTcsANACzbFy7tFzWY5Luu6R1sXa5AkfE9NwyM YUeZ/hYhBEQgV1noJSTab2OdSkjlcyJM9wIsAAB4nQD/anY9/8sSP7HlpFiO 85IhxtEx4oUDZh/tT+Ow7hz99n4BAKzbd6evUyzlmwsDHSYXUOrMRGL+sYqe jS7ff86izlED =aRGO -----END PGP SIGNATURE----- --------295407689d91252ad66230c3f2ee98051bd112624270af35bfa809ef55ca64cd--