Ask HN: Human Independent Sources for Timestamp?
What are some options for a timestamp, like a pattern of sunpots, not a human related thing like dedicated timestamp authorities?
(Even chatgpt won't give me any idea, just forces the use of authorities, even after a long converstation said to make photos of newspaper, after my example was the daily titles of 20 bigest journals. On the macro scale, would measuring sidereal time or pulsars meet your requirement?
On the micro scale, atomic clocks? No, I meant by a timestamp a thing, that assures other people, that another thing certainly does not happened after a specific time. There are authorities, whose in a simplified way:
- I take crypto-hash of a massage, send to a timestamp authority
- That authority digitally sign it with adding the current time. So other people can check with the authority's public key, that is valid, so what I hashed, I cannot created after that time. edit: so there is a problem with sunspots, it assures that it happened not before