IOTA

• First tier
• Coin
• Blockchain platforms

IOTA is an open-source cryptocurrency focused on providing secure communications and payments between machines on the Internet of Things. Using directed acyclic graph (DAG) technology instead of the traditional blockchain, IOTA's transactions are free regardless of the size of the transaction, confirmations times are fast, the number of transactions the system can handle simultaneously is unlimited, and the system can easily scale. IOTA was founded in 2015 by David Sønstebø, Sergey Ivancheglo, Dominik Schiener, and Dr. Serguei Popov.