What is Cardano (ADA)? The Peer-Reviewed Blockchain


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Cardano is a blockchain and smart contract platform that's using peer-reviewed research to avoid the pitfalls of its predecessors.​

  • Cardano is a blockchain platform that's founded on peer-reviewed research.
  • In a milestone for the platform, it launched smart contracts on testnet in May 2021, with a mainnet launch to follow later in the year.
Cryptocurrencies currently face a number of challenges, including scalability, energy consumption, and the ability to interact with regular money. Cardano calls itself a third-generation public blockchain. Its community is working to solve these problems and to improve on its predecessors, such as Bitcoin and Ethereum. As of May 2021, Cardano is the fifth-biggest cryptocurrency by market capitalization.

What is Cardano?​

You’ve heard of first and second generation cryptocurrencies Bitcoin and Ethereum, right? Cardano calls itself the "first third generation cryptocurrency." Like Ethereum, it aims to be a platform on which people can create smart contracts.


It was created by a team led by Charles Hoskinson, in a bid to create a "more balanced and sustainable ecosystem" for cryptocurrencies. Originally developed as a research project, Cardano has evolved into a blockchain platform in its own right. Its creators believed that smart contract blockchains such as Ethereum face challenges around scalability and interoperability, and that those challenges can best be addressed by a new platform developed from the ground up.​

A brief history​

  • 📚 Cardano began in 2015 as a research project to explore how cryptocurrencies could be improved.
  • 👨‍🎨 Cardano was first released to the public on September 29, 2017 with the ‘Bryon’ phase, supporting only ADA transactions.
  • 📡 The next phase, Shelley, launched in July 2020. It improved the network’s decentralization, and meant that holders could stake ADA.
  • 📁 The third stage, Goguen, will add support for smart contracts and native token issuance. It’s due in August 2021.
  • 📈 The final stages are Basho, which focuses on scaling, and Voltaire, which deals with on-chain governance.

What’s so special about Cardano?​

The team behind Cardano has been inspired by the world of science publishing, and has adopted its peer-reviewed approach for their cryptocurrency. What does that mean? Well, all changes and new features introduced are developed, reviewed and agreed upon by academics before being used, including the network's consensus algorithm, Ouroboros (of which more later). The code for the network is written in the Haskell programming language, which is used by companies including Bank of America and AT&T. And IOHK, the company behind Cardano, has published a number of academic papers describing the platform and its technology.

But that's not all!

The Ethereum network currently uses the proof of work consensus mechanism to verify transactions, which uses a lot of electricity and can only process a limited number of transactions at once. Cardano uses proof of stake, which consumes less power; the network uses an algorithm called Ouroboros to choose who creates the next block and to validate blocks. (Ethereum is working to switch to proof of stake by as early as the end of 2021.) Proof of stake advocates believe that a staking-based consensus mechanism makes blockchain networks more secure while significantly reducing their power consumption and carbon footprint.

Cardano developer IOHK has already made progress in identity management and traceability, announcing a number of partnerships; in 2019, IOHK teamed up with footwear manufacturer New Balance to tackle counterfeit sneakers, enabling customers to confirm the authenticity of products using the Cardano blockchain. In April 2021, the company partnered with the Ethiopian government for an identity solution to be rolled out in schools. Ultra-fast transaction speeds and interoperability with other blockchains are in the works too.

What else is different?​

There are three parts to Cardano:
  • 🖧 The Cardano Foundation - supports the research and development of the network.
  • 🏫 IOHK - a company that works in conjunction with several universities on research and development.
  • 🏢 Emurgo - a separate company contracted to work on the blockchain and make it appealing to businesses

How is ADA produced?​

Cardano’s ADA currency isn’t mined like Bitcoin. Instead of miners there are validators, which are chosen by the network depending on how much ADA currency they currently own. If they’re selected to validate the transactions on the block, they place a bet on how confident they are on being able to verify all the transactions. If the blockchain verifies the validator’s block, they effectively win the bet and get a reward in ADA.​

What is Ouroboros?​

Ouroboros is Cardano’s defining algorithm, the first blockchain protocol to be based on peer-reviewed research, and the project’s solution to proof-of-stake. Essentially, the consensus protocol sits behind Cardano's capability as a decentralized proof-of-stake platform. It’s used to secure the network, validate transactions and earn newly minted ADA.

Ouroboros divides transactions into epochs, which are subdivided into time slots. A slot leader is elected for each time slot and is responsible for adding a block to the chain. A new slot leader is required to consider the last few blocks of the received chain as transient. This is known as the “settlement delay,” and is the mechanism through which the ledger is securely passed between participants.​

How do you get hold of ADA?​

As one of the leading top 10 cryptocurrencies, Cardano's ADA is available to buy or trade on most leading exchanges, including Coinbase, Binance, Kraken and eToro.


What can you do with Cardano?​

While you can buy and trade ADA like any other cryptocurrency, and use it to pay for transactions on the blockchain, it isn’t regarded in the same way as a currency like Bitcoin, which can be used to buy goods and services. On the Cardano platform, users need to buy ADA to make transactions, participate in governance, become a slot leader, and earn a share of fees paid for transactions. In July 2020, the Shelley upgrade enabled delegated staking. For the first time, ADA owners were able to pool their coins with other users in order to earn the cryptocurrency.​

The future​

Mining ADA consumes a fraction of the energy it costs to produce Bitcoin—so Cardano was one of a number of proof of stake cryptocurrencies to benefit from a new emphasis on greener credentials for crypto, after Tesla CEO Elon Musk shone a spotlight on the topic in May 2021. A crucial next step for the platform is its roll-out of smart contracts, which launched on the Alonzo testnet in May 2021, and are expected to go live on the Cardano mainnet in August 2021.

It's an important milestone for Cardano, with smart contracts forming a key component of rival blockchains such as Ethereum and Binance Smart Chain. They're also essential to creating decentralized applications (dapps) such as those used in the burgeoning decentralized finance (DeFi) ecosystem. If Cardano can prove that its rigorous approach to cryptocurrencies can bring big business into the world of blockchain, it could find itself at the forefront of a crypto revolution in the years to come.​