Cardano - public blockchain

Founded by Charles Hoskinson (Ethereum cofounder) in 2015.

Proof of stake

Internal cryptocurrency: ADA.

Keyword: Contract

 Similar to class in Java and other object oriented programming languages.

Specify version in each .sol file

 pragma solidity >=0.6.0 <0.9.0;

or

pragma solidity 0.6.0;

or

pragma solidity ^0.6.0

.sol file

Remix IDE

 Work with solidity, work with smart contracts, and deploy to blockchains.