It seemed to me not very difficult, but still let's analyze. What is this decentralized exchange: Target. This can be your own blockchain or smart contract on another blockchain. Responsibilities include accepting orders (order, order) for buying / selling, their matching (matching, matching) Blockchains with support for blocking coins with unlocking by time / secret. Such as ethereum, bitcoin and its fork, eos, etc. Interface (optional). To view the glass, submit orders, notifications, etc. Would any of you write a decentralized multi blockchain exchange for a day? Is it possible? --- I apologize for my English, if there are a lot of mistakes, my lexicon is very small in the subject of cryptocurrency.