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 impleme

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. [1] https://www.gwern.net/Self-decrypting-files https://www.gwern.net/Self-decrypting-files [2] https://en.bitcoin.it/wiki/Timelock https://en.bitcoin.it/wiki/Timelock