Cardano is an open-souce blockchain platform using proof of stake consensus mechanism. It's the first blockchain founded by a peer-reviewed research and built by a decentralized community through evidence-based methods.

Networks Mainnet, Testnet
Released 2017
Consensus Ouroboros Proof of Stake (PoS)
Smart contracts Yes
Block time 20 seconds
Smart contract language(s) supported Marlowe, Plutus
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ADA - the fuel of Cardano

Cardano's native cryptocurrency, ADA, facilitates the internal transactions between peers and can also be staked in the Cardano network. Holders of the coins can delegate them to a stake pool to maintain the successful running of the network and earn rewards.