IOTA

IOTA was founded by a team including Dominik Schiener and David Sønstebø. IOTA was developed to solve inefficiencies in existing IoT networks where traditional blockchains were not viable because of high transaction fees and limited scalability. A major milestone was the 2015 ICO, where the project raised over $500,000.

Since the IOTA Rebased upgrade in May 2025, IOTA operates using delegated proof-of-stake, in which staked validators run the Starfish BFT consensus protocol. This makes it possible for scalability and high throughput without the need for traditional miners, leading to improved speed and very low transaction fees (around 0.005 IOTA for an average transaction, which is burned). The Tangle can theoretically achieve high transactions per second (TPS), with no fixed block time because of the asynchronous structure of Tangle.

IOTA offers several notable features:

• Low-Fee Transactions: Makes microtransactions practical with very low fees (around 0.005 IOTA per average transaction) that apps can sponsor for their users, ideal for IoT devices.
• Data Integrity: Uses masked authenticated messaging to ensure secure communication between devices.
• Scalability: The Tangle architecture allows for high scalability and increased transaction capacities as more users participate in the network.
• IoT Integration: Designed specifically to empower the internet of things ecosystem with machine-to-machine (M2M) interactions.
• Decentralization: Instead of miners, IOTA is secured by a committee of staked validators (delegated proof-of-stake) that produce blocks and finalize transactions.

Despite its promising features, IOTA faces several challenges:

• Stability: The Tangle's architecture requires testing and development to address potential vulnerabilities.
• Adoption: Convincing businesses and developers to adopt IoT infrastructure involving IOTA requires significant effort.
• Regulation: Regulatory changes for IoT and data privacy across different regions can complicate deployments.
• Scalability: While theoretically scalable, real-world stress testing and adoption will demonstrate its true capabilities.
• Complexity: The innovative design may create a learning curve for developers unfamiliar with DAG technology.