Cardano is a third-generation blockchain platform that operates on the Ouroboros Proof-of-Stake consensus protocol. It utilizes an Extended Unspent Transaction Output (EUTXO) accounting model, which combines the security of Bitcoin’s UTXO model with the expressiveness of smart contracts. The network is engineered for high assurance applications, using formal verification methods to mathematically prove the correctness of its code.

Cardano has recently implemented critical milestones in its roadmap, specifically shifting from centralized management to community-led governance and expanding its sidechain ecosystem:

Chang Hard Fork (Voltaire Era): In September 2024, the network executed the Chang Hard Fork, officially entering the "Voltaire" era. This upgrade activated CIP-1694, enabling full on-chain governance. ADA holders can now elect Delegate Representatives (DReps) to vote on protocol changes and treasury management, replacing the previous genesis key management structure.

Midnight Sidechain Launch: In December 2025, the ecosystem launched Midnight, a data-protection sidechain. Midnight allows developers to build compliance-friendly dApps that utilize "selective disclosure" (Zero-Knowledge) technology, enabling privacy for sensitive data while keeping the ledger public.

Ouroboros Leios: As of late 2025, the engineering team has advanced Leios, a protocol upgrade designed to separate transaction throughput from block consensus. This architecture aims to significantly increase network speed (TPS) without compromising decentralization.

The ADA token is central to the network's operation and security:

Staking: Users delegate ADA to Stake Pools to validate blocks. Unlike many other PoS systems, Cardano staking does not require locking assets for a fixed period; ADA remains liquid in the user's wallet.

Governance: Post-Chang, ADA is a governance token. Holders use it to vote for DReps, who then approve or reject governance actions such as protocol parameter changes or withdrawals from the Cardano Treasury.

Network Fees: ADA is the native currency for all transaction fees and smart contract execution costs.

Consensus: Ouroboros Proof-of-Stake

Smart Contract Language: Plutus (based on Haskell)

Total Supply: Fixed cap of 45 Billion ADA

Governance Model: On-Chain (DReps, SPOs, Constitutional Committee)