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IOTA (derived from the smallest letter in the Greek alphabet Iota) is a digital payment system – also called crypto currency. Reference software for the settlement of IOTA payments was published as open source. IOTA is focused on secure communication and payment between two machines within the Internet of Things. One design goal is the fast processing of transactions without high computational effort and without costs. At the end of 2017, the market capitalization was around $ 12 billion. IOTA was one of the ten largest cryptocurrencies at the time.
Unlike Bitcoin, IOTA does not use a blockchain based on a linked list. Transactions are instead captured in a directed acyclic graph. This should reduce transaction costs and achieve better scalability than blockchain-based cryptocurrencies. For IOTA transactions, there are no direct transaction fees, but the sender of a transaction has to provide computing power (proof of work).
IOTA does not represent a decentralized currency in its present form, since the security of the system is partly based on a central instance, the so-called coordinator . The source code of the coordinator is not published as open source. The aim of the project is to be able to do without the coordinator in the medium term.
The IOTA Foundation has extensive industrial cooperation.  Among other things, the foundation develops together with Deutsche Telekom, Fujitsu and Samsung a so-called “data market” based on the technology used in IOTA.
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