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[185.70.43.16]) by gmr-mx.google.com with ESMTPS id 4fb4d7f45d1cf-68ceb83fc17si147149a12.4.2026.06.02.08.29.42 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2026 08:29:42 -0700 (PDT) Received-SPF: pass (google.com: domain of darosior@protonmail.com designates 185.70.43.16 as permitted sender) client-ip=185.70.43.16; Date: Tue, 02 Jun 2026 15:29:39 +0000 To: Saint Wenhao From: "'Antoine Poinsot' via Bitcoin Development Mailing List" Cc: Pol Espinasa , "bitcoindev@googlegroups.com" Subject: Re: [bitcoindev] [BIP Draft] Testnet 5 Message-ID: In-Reply-To: References: Feedback-ID: 7060259:user:proton X-Pm-Message-ID: 92eb44a188ea7803fd1f25b3f2583992b87d4bc9 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="b1=_K8pSWlllAmfSckkmhvP62l5Ljm3HIK5Oks0vknyw" X-Original-Sender: darosior@protonmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@protonmail.com header.s=protonmail3 header.b=riBYiapy; spf=pass (google.com: domain of darosior@protonmail.com designates 185.70.43.16 as permitted sender) smtp.mailfrom=darosior@protonmail.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=protonmail.com X-Original-From: Antoine Poinsot Reply-To: Antoine Poinsot 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 (-) --b1=_K8pSWlllAmfSckkmhvP62l5Ljm3HIK5Oks0vknyw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, On Tuesday, June 2nd, 2026 at 11:05 AM, 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/ I for one believe we are better off ripping the band-aid and starting fresh= than trying to pile up more workarounds. >> 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). > >> 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. > > Also, I wonder if testnet5 will have any premine. Previous attempt to cre= ate testnet5: https://bitcointalk.org/index.php?topic=3D5543921 > >> Testnet 5 also does not apply the difficulty exception rule from Testnet= 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. > > 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 te= stnet 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 draft= 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 Group= s "Bitcoin Development Mailing List" group. >> To unsubscribe from this group and stop receiving emails from it, send a= n email to bitcoindev+unsubscribe@googlegroups.com. >> To view this discussion visit https://groups.google.com/d/msgid/bitcoind= ev/BrgqDZiNhpEz32-Z9ZX2rrPDE9EUIb62SKT2WsTo-yZtd3gLMLVk6TkO6kLIR96-87TumXqi= 92l_m1j3xlJr1tcJwG_I3UVDk2NZgXZL8fw%3D%40protonmail.com. > > -- > 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/bitcoinde= v/CACgYNOKGG1ht-2deT3jP81BzMrcqYd8tTL-tXeX-Z5sugUngJw%40mail.gmail.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/= Note5jyeHB1BStZ3AMHw2aYjj8KmOuSO7wl8FAAEj8lzo9PFX6972iUY6iWbcG0VidvpgRbw-gh= 1dZTC3DTlELA3pjANhz_1WLW7P1KiXL4%3D%40protonmail.com. --b1=_K8pSWlllAmfSckkmhvP62l5Ljm3HIK5Oks0vknyw Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,
=20
=20
=20

On Tuesday, June 2nd, 2026 at 11:05 AM, Saint Wenhao <saintwenha= o@gmail.com> wrote:
> I am sharing a BIP draft for a new Testne= t5.

Interesting. Does it mean, that testnet4 fixes won't be done? ht= tps://batmanbytes.github.io/testnet4-softfork/

I for one believe we are better o= ff ripping the band-aid and starting fresh than trying to pile up more work= arounds.

> For the Pubkey field, use a recent= Bitcoin mainnet block hash.

Do you mean taking the hash of the bloc= k, and using it as x-value for a public key? Then, it could be potentially = spendable, if it would be a valid secp256k1 point, and people would send mo= re coins to it, or unspendable, if it would be outside of the curve. For ex= ample:

spendable: 0200000000000000000001799c6f72ebe5ebc6b18fd5cdf8bd= 3697b8d73d01b084 OP_CHECKSIG
unspendable: 02000000000000000000013ac2955a= 2b6029bc1a86ab4b19e01e8030ceb0eeb2ae OP_CHECKSIG
unspendable: 0000000000= 0000000001799c6f72ebe5ebc6b18fd5cdf8bd3697b8d73d01b084 OP_CHECKSIG

A= lso, if the size of the stack push would be different than 33 or 65 bytes, = then it would be unspendable (for example if it would take 32 bytes, like b= lock hashes, and would be followed by OP_CHECKSIG, to invalidate it, or if = it would start with OP_RETURN).

> Difficulty: 0x1d00ffff

I= wonder, how quickly it would be listed on exchanges, and traded. Because h= istorically, new testnets were launched, when that happened. But today, new= coins are listed faster, than they are replaced. Which would give the crea= tor with any ASIC an incentive, to mine initial 30k or so blocks, keep them= for a while, and then sell for BTCs, when the coin will be listed.

= Also, I wonder if testnet5 will have any premine. Previous attempt to creat= e testnet5: https://bitcointalk.org/index.php?topic=3D5543921

&= gt; 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, an= d remove that rule completely from sources, but it would probably take a wh= ile to deprecate testnet3 and testnet4.

wt., 2 cze 202= 6 o 13:27 'Pol Espinasa' via Bitcoin Development Mailing List <
I am sharing a = BIP draft for a new Testnet5.
People are complaining about Testnet4 being difficult to use, = the new testnet also works as a miner playground for BIP54, we are killing = two birds with one stone.

Feel free to leave inline comments there or res= pond here on the list.


Pol

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