chainparams: remove my testnet3 seed #35783

pull Sjors wants to merge 1 commits into bitcoin:master from Sjors:2026/07/testnet3 changing 2 files +0 −2

Sjors commented at 10:14 AM on July 23, 2026: member

With testnet3 long deprecated, albeit still not dropped #31975, and testnet5 on the horizon, this seems like a good time. I plan to keep it up and running until v31 is end-of-life, so no need to backport.
chainparams: remove my testnet3 seed 7295b8be70
DrahtBot commented at 10:14 AM on July 23, 2026: contributor



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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35783.



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ACK fanquake, nebula-21, willcl-ark

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willcl-ark commented at 10:27 AM on July 23, 2026: member

Concept ACK.

While we are on this, do you know whats up with your (and Wiz') testnet4 seeds? By my metrics they don't return any good seeds. Perhaps none exist, and they are doing the best they can; have you checked up on it recently?

Type	Reviewers
ACK	fanquake, nebula-21, willcl-ark

Sjors commented at 10:42 AM on July 23, 2026: member

bitcoin-maintainer-tools % ./check-dnsseeds.py
* mainnet
...
OK   seed.bitcoin.sprovoost.nl (36 results)
...

* testnet
...
OK   seed.testnet.bitcoin.sprovoost.nl (34 results)
...

* testnet4
OK   seed.testnet4.bitcoin.sprovoost.nl (34 results)
OK   seed.testnet4.wiz.biz (22 results)

I'll take a look at the machine to investigate further.

willcl-ark commented at 11:01 AM on July 23, 2026: member

Yeah they are all up! But I think they just return un-contactable nodes. As I said before, this may be simply because there are no testnet4 nodes who are up long-enough to be reliable? I dunno...
Sjors commented at 12:00 PM on July 23, 2026: member

@willcl-ark Claude says my testnet4 seed is fine and your tool is broken :-)

<img width="794" height="432" alt="Schermafbeelding 2026-07-23 om 13 59 57" src="https://github.com/user-attachments/assets/fa0a7167-345b-48df-99d0-49e69d3ba9d4" />

Did it show more positive stats in the past?
willcl-ark commented at 12:05 PM on July 23, 2026: member

I think Claude may be right...

It is a forked project I changed a single LoC in (to test my own seed), but this certainly doesn't look promising:

https://github.com/willcl-ark/dns-monitor/blob/d8f541378612c4f59168f5c4d8c279abe021349b/dns_monitor/handshake.py#L20-L24

Sorry to have taken your time with this :'(
fanquake commented at 1:14 PM on July 23, 2026: member

ACK 7295b8be704a406cf8875641aa9066e071323093
DrahtBot requested review from willcl-ark on Jul 23, 2026
nebula-21 commented at 4:55 PM on July 23, 2026: contributor

ACK 7295b8be704a406cf8875641aa9066e071323093

I have a question: Since testnet3 is deprecated, why not remove the whole vSeeds list (or the whole CTestNetParams seed section) now instead of one at a time? Nodes would still be able to connect using other ways, but a fresh node wouldn't get automatic bootstrapping.
Sjors commented at 5:06 PM on July 23, 2026: member

@nebula-21 that will be done when testnet3 is dropped. This is about me planning to drop my testnet3 seed, not Bitcoin Core dropping support for testnet3.
willcl-ark approved
willcl-ark commented at 9:58 PM on July 23, 2026: member

ACK 7295b8be704a406cf8875641aa9066e071323093
sedited merged this on Jul 24, 2026
sedited closed this on Jul 24, 2026
Sjors deleted the branch on Jul 24, 2026

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#31975 RFC: when to drop testnet3

chainparams: remove my testnet3 seed #35783

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