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27 May 21 22:00:54 [SpamScore: 0.000000] [Captcha: 1.00 %] No.136112235521
They also don't increment by one upon a new post. I suspect they're derived from some time stamp. Unix time is currently 16... so that's certainly not it. GPS time is currently at 130... which is close but not quite.
>> 27 May 21 22:10:28 [SpamScore: 0.000000] [Captcha: 1.00 %] No.136112823296
Looks like the code responsible is in resources/ids.go and resources/snowflakes/generator.go. It does indeed derive from a timestamp