Zero Knowledge Contingent Payments are one approach. Encoding everything that you might want to buy as an input to a ZKP system is a stretch, obviously. But at

Zero Knowledge Contingent Payments are one approach. Encoding everything that you might want to buy as an input to a ZKP system is a stretch, obviously. But at least, that's the spirit of this philosophy. https://bitcoincore.org/en/2016/02/26/zero-knowledge-contingent-payments-announcement/ https://bitcoincore.org/en/2016/02/26/zero-knowledge-conting...