Although blockchains are the most common DLT type, other DLTs based on Directed Acyclic Graph (DAG) data structures, and hybrid blockchain-DAG approaches are gaining in popularity because they decrease transaction data size and transaction costs, while increasing transaction speeds.[17][18][19] Examples of DAG DLT cryptocurrencies include MIOTA (IOTA Tangle DLT) and HBAR (Hedera Hashgraph DLT).