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A comment on Ask HN: What weird or hard problems are you trying to solve?. Parent comment

Re:Ask HN: What weird or hard problems are you trying to solve? by yissp on Sunday July 05, 2020 @08:23PM (#23743475)
What if we generate a random number every, say, 5 minutes and maintain a log of them along with their timestamp. Then the time traveler could just look up a few entries immediately after their destination time and convince people by predicting them in advance. Not immediate but pretty quick.
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Re:Ask HN: What weird or hard problems are you trying to solve? by phroobster on Monday July 06, 2020 @01:48AM (#23745073)
The hash of the next bitcoin block can already be used for this. Easy tamper resistant random number every 10 minutes.
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Re:Ask HN: What weird or hard problems are you trying to solve? by ballenf on Monday July 06, 2020 @12:15AM (#23744640)
Wouldn’t the butterfly effect change the numbers? If not then the numbers need more entropy and less pseudo.
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