Is it possible to implement a time capsule in software? For example, somehow (cryptographically?) enforce that the contents of the software are not readable until a date in the future?
You're looking for "time lock encryption". Gwern [1] is a reasonable place to start. Or re Bitcoin [2]. But as these state, the risk is your specific implementation tech breaks in the intervening decades.
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[ 4.9 ms ] story [ 17.7 ms ] threadfyi https://medium.com/coinmonks/testing-time-dependent-logic-in...
[1] https://www.gwern.net/Self-decrypting-files [2] https://en.bitcoin.it/wiki/Timelock