seeds: drop 21.ninja as a makeseeds source #36818

1. 
   0xB10C commented at 5:00 PM on November 9, 2026: contributor

   The seeds.txt.gz file was last generated on 2026-05-22 (as per the comment in the first line and the most recent entry). This is about 6 months old now, and probably 10 months when used for the next release. There is no point in feeding (mostly) stale addresses into makeseeds.py and keeping the domain around just risks someone else getting access to the host or domain to insert malicious or fake addresses into it.

   My understanding is that the owner of 21.ninja stepped away from Bitcoin development and probably will not maintain the seeder going forward. I'm reaching out to them directly and ping them in a comment below. Happy to close this if they come back and plan to keep maintaining the seeds.

   Also dropping stale documentation about sipa's seed (removed in #35691) being used for makeseeds.

2. 
   0xB10C commented at 5:00 PM on November 9, 2026: contributor

   ping @virtu! Do you plan to maintain this going forward or can it be dropped?

   ---

   This leaves us with only one source for the fixed seeds. I know @willcl-ark is also running a seeder that can be used for this. I'll leave it up to him if he wants to add his seeds.txt.gz here.

3. 
   DrahtBot commented at 5:00 PM on November 9, 2026: contributor

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   • Code coverage & benchmarks: https://corecheck.dev/bitcoin/bitcoin/pulls/36818
   • Ralph review <img src=https://review.fish.foo/assets/bitcoin/bitcoin/36818.png alt="Ralph review status"> https://git.fish.foo/bitcoin/bitcoin/pulls/36818#author-ralph

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4. fanquake added the label Needs backport (30.x) on Nov 9, 2026
5. fanquake added the label Needs Backport (31.x) on Nov 9, 2026
6. fanquake added the label Needs Backport (32.x) on Nov 9, 2026
7. fanquake added this to the milestone 33.0 on Nov 9, 2026
8. seeds: drop 21.ninja as a seed source

   The seeds.txt.gz file was last generated on 2026-05-22 (as per the
   comment in the first line and the most recent entry). This is about
   6 months old now, and probably 10 months when used for the next release.
   There is no point in feeding (mostly) stale addresses into makeseeds.py
   and keeping the domain around just risks someone else getting access to
   the host or the domain to insert malicious or fake addresses into it.
   
   My understanding is that the owner of 21.ninja stepped away from Bitcoin
   development and probably will not maintain the seeder going forward. I'm
   reaching out to them directly and ping them in a comment below. Happy to
   close this if they come back and plan to keep maintaining the seeds.

   6b27e165e2
9. 0xB10C force-pushed on Nov 9, 2026
10. 
    0xB10C commented at 6:46 PM on November 9, 2026: contributor

    Added a commit that drops the stale documentation about sipa's seed, which was removed in #35691, from the README, which was missed there.

11. seeds: drop documentation about sipa's seed from the README

    It was removed in https://github.com/bitcoin/bitcoin/pull/35691 but
    the documentation was not updated.

    027f13c79e
12. 0xB10C force-pushed on Nov 9, 2026
13. DrahtBot added the label CI failed on Nov 9, 2026
14. DrahtBot removed the label CI failed on Nov 9, 2026
15. 
    willcl-ark commented at 10:53 AM on November 10, 2026: member

    Happy to have my seed dumps added here. My crawler/seeder has been running over a year now (maybe over 2 years) without interruption.

    I have only have two networks currently, mainnet and signet:

    https://bitcoin.fish.foo/seeds.txt.gz https://signet.bitcoin.fish.foo/seeds.txt.gz

    Both have IPv4, IPv6, Tor and I2P addresses, no CJDNS currently. Currently bit thin on Tor addresses due to a too-short timeout configuration, but I have just fixed this and Tor addresses will recover to normal levels.

Milestone
33.0