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+Message-ID: <7c28f8e9-d221-4633-8b71-53b4db07fa78@schildbach.de>

+Date: Fri, 14 Mar 2025 10:12:57 +0100

+MIME-Version: 1.0

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+Subject: Re: [bitcoindev] Does anyone still need testnet3?

+Content-Language: en-US

+To: Sjors Provoost <sjors@sprovoost.nl>,

+ Bitcoin Development Mailing List <bitcoindev@googlegroups.com>

+References: <9FAA7EEC-BD22-491E-B21B-732AEA15F556@sprovoost.nl>

+From: "'Andreas Schildbach' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>

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+

+Hi Sjors,

+

+thanks for asking.

+

+Bitcoinj has just started to implement testnet4, but it's not finished=20

+yet. And the next version 0.18 will probably not be released within 12=20

+months, maybe longer.

+

+By the way, testnet3 works great for us (for testing). I consider block=20

+storms a feature, because it tests our code in rough conditions. We had=20

+planned to support both testnets in the forseeable future.

+

+https://github.com/bitcoinj/bitcoinj/

+

+Then, there is btc-rpc-explorer, a self-hostable block explorer. It=20

+doesn't yet support testnet4. I'm not affiliated to it, I'm just a user.

+

+https://github.com/janoside/btc-rpc-explorer

+

+Cheers,

+Andreas

+

+

+On 14/03/2025 09.52, Sjors Provoost wrote:

+> Dear list,

+>=20

+> Testnet 4 was proposed last year in BIP94 [0] and is supported by Bitcoin=

+ Core since v28.

+>=20

+> To make Bitcoin Core easier to maintain we would like to drop support for=

+ Testnet3 in a future release. This will happen no earlier than v30 this fa=

+ll. The upcoming v29 release still supports it, and will throughout its mai=

+ntenance period [1].

+>=20

+> The network itself can't be deleted, so anyone willing to maintain node s=

+oftware themselves can keep using testnet3 until the end of time.

+>=20

+> One of the motivations for introducing testnet4 was that testnet3 became =

+increasing impractical to use due to block storms. So perhaps everyone alre=

+ady moved on to using testnet4 or a signet.

+>=20

+> As an aside, it's possible to create a pure proof-of-work permissionless =

+signet without any signatures, by setting the challenge to OP_TRUE. [2]

+>=20

+> However, if anyone is still using testnet3 and needs more time to move aw=

+ay from it, please let us know. E.g. as a reply to the list or a comment on=

+ the Github issue [3]. This could include libraries, staging environments, =

+testnet wallets, etc.

+>=20

+> Although the v29 maintenance window will last for a few years, it's also =

+important to know if dropping testnet3 would prevent you from upgrading to =

+the next major node version. In other words, if migrating away from testnet=

+3 would take you longer than all of 2025.

+>=20

+> Although "I don't feel like it" isn't a great technical argument, it's st=

+ill useful to know what to expect and perhaps others can help.

+>=20

+> - Sjors

+>=20

+> [0] https://github.com/bitcoin/bips/blob/master/bip-0094.mediawiki

+> [1] https://bitcoincore.org/en/lifecycle/#maintenance-period

+> [2] https://github.com/bitcoin/bips/blob/master/bip-0325.mediawiki#specif=

+ication

+> [3] https://github.com/bitcoin/bitcoin/issues/31975

+>=20

+

+--=20

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