  IOTA Tangle is a distributed ledger technology (DLT), primarily designed for
Internet-of-Things (IoT) networks and applications. IOTA Tangle utilizes a
direct acyclic graph (DAG) structure for the ledger, with its protocol offering
features attractive to the IoT domain, over most blockchain alternatives, such
as feeless transactions, higher achievable transactions per second (TPS), and
lower energy consumption. The original IOTA implementation relied on a
bootstrap centralized coordinator solution for consensus which limited its
degree of decentralization and scalability. This concern, alongside other
limitations to its adoption, such as lack of smart contracts, are being
addressed with the release of IOTA 2.0. This update brings with it significant
changes in order to remove the coordinator and achieve a scalable decentralized
solution. To this end, this paper provides a technical overview of the key
features of IOTA 2.0 while discussing their relevance and benefits for the
wider IoT ecosystem. The paper also provides performance insights and future
research directions for IOTA 2.0.
