3 ms·
On the macro scale, would measuring sidereal time or pulsars meet your requirement? On the micro scale, atomic clocks?
by robga 3y ago
On the macro scale, would measuring sidereal time or pulsars meet your requirement?
On the micro scale, atomic clocks?
- azatom 3y agoNo, 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