Coin Series (2/100)

The next coin to BTC is for sure Ethereum .

Ethereum is a decentralized open-source blockchain system that features its own cryptocurrency, Ether. ETH works as a platform for numerous other crypto as well as for the execution of decentralized smart contracts.
Smart contracts are computer programs that automatically execute the actions necessary to fulfill an agreement between several parties on the internet
 Ethereum plans to switch to proof of stake ,known as ETH 2.0

ETH Data : 
Supply : 120,903,523
ATH : $4,891.70
Market Cap : 238,112,310,103
Listed Exchanges : All Major Exchanges

Since many projects of NFTs ,tokens are used . It is one of most used blockchain and has hue growth potential. 

The main problems is that due to it's heavy gas fees and not fixed supply , many blockchain has been arises in market with the target to substitute ETH.
Although ,ETH can be traded in exchanges with fees same as others based on trading volumes.