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In this article, I’m going to show you how to code Craigslist for the Ethereum blockchain. The business model of a public blockchain classifieds board will need to be different from that of Ebay and company. Existing platforms need to maintain their own servers. A decentralized platform is maintained by its users, so the cost of running the core platform drops to zero for the platform owner. There are multiple ways of dealing with this either in the smart contract or in the front-end. The basics of the board are not complex. All the adverts in the board will be just a struct with a few fields.