Cardano

What it is

Cardano is a proof-of-stake layer 1 blockchain that set out to do everything the slow way: research first, peer review second, code third. It launched in September 2017, built by Input Output, the engineering company founded by Charles Hoskinson, a co-founder of Ethereum, together with Jeremy Wood. The memorable fact: its Ouroboros consensus protocol was the first proof-of-stake design published with formal security proofs in an academic setting, and the project has kept publishing research papers ever since.

How it works

Proof of stake means the network is secured by people locking up the currency itself rather than by burning electricity on mining. ADA holders delegate their coins to stake pools, community-run validators, and earn a share of rewards without ever giving up custody or locking their funds. Cardano records transactions using an extended version of Bitcoin’s accounting model rather than Ethereum’s, a design its engineers argue makes transaction outcomes more predictable. Native tokens can be issued without smart contracts, while the Plutus platform handles programmable logic. Supply is capped at 45 billion ADA, with about 37 billion circulating; the remainder is released gradually through staking rewards.

The story so far

Cardano shipped in named eras. Byron delivered the basic ledger in 2017, Shelley brought decentralised staking in 2020, and the Alonzo upgrade added smart contracts in September 2021, four years after launch. The Chang hard fork in 2024 and the Plomin upgrade in early 2025 delivered the Voltaire era of on-chain governance, under which ADA holders and elected representatives vote on protocol changes and treasury spending under a written constitution. The persistent criticism is pace: rivals shipped faster and captured more DeFi activity, and Cardano’s usage has often trailed its market value. Its defenders answer that a system intended to carry serious value should be built like infrastructure, not a startup experiment. Both things can be true at once.

Where it stands

As of late July 2026, CoinGecko places Cardano at about 19th or 20th by market value, essentially level with Stellar, at roughly $6.1 billion. ADA trades at about $0.16, around 95 per cent below its September 2021 peak of $3.09, one of the deeper drawdowns among veteran top-tier assets. What to watch next: whether on-chain governance produces sensible treasury decisions, whether the Hydra scaling work and sidechain projects lift real activity, and whether developer numbers grow now the governance framework is complete. Cardano has outlasted many faster-moving rivals, and as of July 2026 the open question is unchanged: can a blockchain built like an academic project become one that people actually queue up to use?