Cardano appeared in 2014. Crypto currency is represented on the exchanges under the symbol ADA. The project is interesting, primarily because instead of the Proof of Work technology, the Ouroboros algorithm is involved. It does not consume much energy, unlike PoW, where production is conducted through energy-intensive mining on powerful devices. There is the Cardano Foundation, responsible for the standardization, protection and promotion of the project. As for developments, it is led by the IOHK team.


Monero
The basis is the algorithm CryptoNote. The extraction is carried out using classical mining based on the Proof of Work algorithm. To protect the privacy of users, the Ring Signature system is used. Thanks to the "ring signature", it is not possible to monitor transactions on the network. The main advantages are full confidentiality, decentralization of the system and scalability. For example, Monero has no restrictions on the size of the block.