Cardano (ADA)

Cardano is a proof-of-stake blockchain with smart contract support, and ADA is its native cryptocurrency. Led by Ethereum co-founder Charles Hoskinson, the network launched in September 2017. Its defining approach is that protocol designs are first published as academic papers and peer-reviewed before being built. The network is named after the Italian mathematician Gerolamo Cardano, and ADA after Ada Lovelace, often described as the first computer programmer.

How does Cardano work?

Cardano runs on Ouroboros, a proof-of-stake protocol. Time is divided into five-day “epochs”, each made up of one-second “slots”. For each slot, a stake pool is randomly selected to produce a block, with the odds weighted by how much ADA is delegated to it. Thousands of independent stake pools run the network.

Three organisations have shaped Cardano’s development: Input Output (IOG), which builds the core technology; the Cardano Foundation, which supports the ecosystem; and Emurgo, which focuses on commercial adoption. With on-chain governance now live, the member-based organisation Intersect also plays a major role in coordinating the community.

Instead of Ethereum’s account model, Cardano uses an extended version of Bitcoin’s UTXO model (eUTXO). This means the outcome of a transaction, and its exact fee, can be predicted in the wallet before it is submitted. The trade-off is that building apps where many users interact with the same contract at once takes more engineering effort.

What is ADA used for?

• Transaction fees: transfers and smart contract interactions on Cardano are paid in ADA.
• Staking: holders delegate their wallet to a stake pool and earn rewards.
• Governance: ADA holders can vote directly in on-chain governance or delegate their vote to a representative (DRep).
• Native tokens: a small amount of ADA must accompany tokens and NFTs issued on Cardano when they are moved.

How does staking work on Cardano?

Staking on Cardano is lock-free: your ADA never leaves your wallet, and you can spend it or switch pools at any time. Starting delegation requires a small refundable deposit. The first rewards arrive after a few epochs and are then paid every five days. How much you earn depends on the pool’s performance, its fees and how saturated it is.

ADA supply

ADA’s maximum supply is capped at 45 billion. Any ADA not distributed at launch sits in a reserve, and a fixed percentage of that reserve is released each epoch to fund staking rewards and the Cardano treasury. As the reserve shrinks, new issuance slows down. ADA accumulated in the treasury can be spent on ecosystem projects through governance votes.

Key milestones

• 2017 (Byron): mainnet launched.
• 2020 (Shelley): stake pools and delegation went live, decentralising block production.
• 2021 (Mary and Alonzo): native tokens and Plutus smart contracts arrived.
• 2022 (Vasil): smart contract efficiency improved.
• 2024–2025 (Chang and Plomin): on-chain governance (CIP-1694) was activated, giving ADA holders a vote on treasury spending and protocol changes.

What are the risks of Cardano?

ADA is volatile. Cardano’s DeFi ecosystem and total value locked remain small compared with rivals such as Ethereum and Solana, so technical strengths have not always translated into user adoption. Its slow, staged development approach can mean new features arrive later than on competing chains. The influence of large ADA holders and representatives in governance is also a subject of debate.

How to read ADA market data

With a 45 billion cap, the gap between circulating and maximum supply shows how much ADA has yet to be released from the reserve. A high share of ADA is staked, but because staking does not lock tokens, it does not directly reduce liquidity. Alongside volume and market cap, on-chain data such as active wallets give a better sense of real network usage.

Official Resources

• Cardano: Network and ADA Documentation
• Cardano: Extended UTXO Model
• Intersect: Cardano Governance Resources
• Cardano: Stake Pool Delegation