Cardano (blockchain platform)

Cardano was launched in September 2017 by Input Output Hong Kong (IOHK), a blockchain engineering company founded by Charles Hoskinson and Jeremy Wood. The project was named after Gerolamo Cardano, an Italian Renaissance polymath, and its token ADA honors Ada Lovelace. Development is overseen by three organizations: IOHK, the Cardano Foundation (based in Zug, Switzerland), and Emurgo, a commercial partner. The platform's roadmap is divided into five eras: Byron (foundation), Shelley (decentralization), Goguen (smart contracts), Basho (scalability), and Voltaire (governance). The Shelley era, completed in 2020, transitioned the network from a federated to a fully decentralized system. The Goguen era, completed in 2021, introduced smart contract functionality through the Alonzo hard fork, enabling the deployment of Plutus scripts.

Cardano's architecture is unique in its separation into two layers: the Cardano Settlement Layer (CSL) and the Cardano Computation Layer (CCL). The CSL handles the transfer of ADA and maintains the ledger, while the CCL executes smart contracts and dApps. This separation allows for easier upgrades and customization. The consensus protocol, Ouroboros, is the first proof-of-stake protocol to be based on peer-reviewed research. It uses a slot leader election mechanism where stake pools are selected to produce blocks, with rewards distributed proportionally to stake. Cardano is written primarily in Haskell, a functional programming language known for its strong static typing and formal verification capabilities. Smart contracts are written in Plutus, a Haskell-based language, and Marlowe, a domain-specific language for financial contracts.

Cardano aims to achieve self-sustaining governance through the Voltaire era, which introduces a treasury system and on-chain voting. The treasury collects a portion of transaction fees and block rewards, which are then used to fund development proposals approved by ADA holders. This model is designed to ensure the network's long-term sustainability without relying on external funding. The project also emphasizes formal methods and peer review; all major protocol changes are subject to academic scrutiny. Cardano has partnered with governments and institutions, notably in Ethiopia, where it is used to track student performance in schools. The platform's commitment to interoperability is evident in its development of sidechains and the Mithril protocol, which aims to improve node synchronization efficiency.

Beyond its mainstream reputation, Cardano has several lesser-known facets. The Ouroboros protocol has multiple variants, including Ouroboros Praos and Ouroboros Genesis, each addressing different security and performance aspects. Cardano's testnet, known as the Cardano Testnet, is used for experimentation and is separate from the mainnet. The platform has a unique 'treasury' mechanism that is funded by a 20% tax on block rewards, which is not widely publicized. Cardano also supports native tokens without the need for smart contracts, a feature introduced in the Mary hard fork. The project's founder, Charles Hoskinson, has been a vocal advocate for blockchain in developing countries, and Cardano has been involved in projects in Africa, including a collaboration with the Ethiopian government. Additionally, the Cardano Foundation is responsible for promoting the platform and fostering adoption, but it does not control the network's technical development.

ADA

The native cryptocurrency of the Cardano platform, used for transactions and staking.

Ouroboros

The proof-of-stake consensus protocol underlying Cardano, notable for its peer-reviewed design.

Plutus

A smart contract language for Cardano, based on Haskell.

Stake pool

A node in the Cardano network that holds ADA on behalf of delegators and participates in block production.

Hard fork

A protocol upgrade that introduces new features and is not backward-compatible.