  In recent years, the volume of data generated by IoT devices has increased
dramatically. Using this data can improve decision-making in the public and
private sectors and increase productivity. Many attempts have been made to
enhance and adapt businesses to exploit this IoT data. Among these, IoT data
trading is the most popular approach. To this end, ongoing projects are
currently focused on developing decentralized data marketplaces for IoT using
blockchain and cryptocurrencies. Here we explore how a decentralized data
marketplace could be created using IOTA tangle and IOTA smart contract chains
(SC chains). We also consider the advantages of such architecture in terms of
cost, scalability, and privacy over current designs and introduce the various
elements it should have.
