They've even been understood for years too... For example, today I participated in a demonstration of trustlessly, privately, and securely selling information

They've even been understood for years too... For example, today I participated in a demonstration of trustlessly, privately, and securely selling information (a 16x16 sudoku solution) via Bitcoin: https://bitcoincore.org/en/2016/02/26/zero-knowledge-contingent-payments-announcement/ https://bitcoincore.org/en/2016/02/26/zero-knowledge-conting... (But you probably won't read about it on HN; no profit in promoting it. </cynic>)