I need some ideas of a cool way to time stamp a certificate. Obviously writing thr block height is one thing, but I'd like to "open" PGP encrypt a message on a certificate containing some type of verifiable time stamp.
Ideas?
1073 sats \ 1 reply \ @petertodd 8 Nov 2023
A timestamp proves that a message existed before a specific time. What you are describing actually does the opposite: proves that a message was created after a specific time. To do that, you can use random beacons: numbers that we know didn't exist prior to a specific point in time. Bitcoin block hashes make for good random beacons.
The problem is it's very hard to come up with schemes where random beacons are actually secure and useful; timestamps are much easier to actually use.
For timestamping, my OpenTimestamps tool is by far the easiest thing to use: https://OpenTimestamps.org
reply
0 sats \ 0 replies \ @satoshi_in_the_classroom OP 8 Nov 2023
Thank you
reply
291 sats \ 1 reply \ @DarthCoin 8 Nov 2023
https://opentimestamps.org/ - by @petertodd
reply
0 sats \ 0 replies \ @satoshi_in_the_classroom OP 8 Nov 2023
Thank you
reply
0 sats \ 0 replies \ @0245bdaef2 8 Nov 2023
proofofexistence.com
reply