OpenBazaar

OpenBazaar is an open source project developing a protocol for e-commerce transactions in a fully decentralized marketplace. It uses cryptocurrencies as medium of exchange and was inspired by a hackathon project called DarkMarket - wikipedia

"The Ricardian contract is a means of tracking the liability (Legal liability) of one party to another when selling goods to each other in OpenBazaar. Fundamentally, a contract represents a single unit of a good or service. Ricardian contracts should be used in OpenBazaar as they are means of effectively tracking legitimately signed agreements between two parties, which cannot be forged after the contract has been signed. Ricardian contracts make use of a chain of digitally signed and checksum hashed contracts to create an unalterable record of agreement for an exchange on a peer-to-peer network." "Trades on the OpenBazaar network are based on Ricardian Contracts,Iang - The Ricardian Contract The Ricardian Contract i.e. an electronic document that defines the terms of a trade such that it is readable by computers and humans, and is cryptographically signed. Apart from selling physical and digital products, OpenBazaar can also be used to trade speculative contracts, which can be readily represented by Ricardian Contracts" || Dr Washington