CryptoCurrency (is) The Flag aka CCTF
"Cryptocurrencies such as Bitcoin and Ethereum allow you to handle digital assets on decentralized networks. In most cases the assests are simply coins, but here is where Ethereum can provide you more: smart contracts. Imagine coding a program that you broadcast once to a decentralized network, it gets stored on the blockchain and can be called anytime in the future. Or imagine a business that does not have physical contracts, just virtual ones. All these are secure as long as somebody successfully cheats the consensus or exploits vulnerabilities in contrats. It may sound complicated for the first, but it is not...."
Link: https://cryptoctf.org/guide
"Cryptocurrencies such as Bitcoin and Ethereum allow you to handle digital assets on decentralized networks. In most cases the assests are simply coins, but here is where Ethereum can provide you more: smart contracts. Imagine coding a program that you broadcast once to a decentralized network, it gets stored on the blockchain and can be called anytime in the future. Or imagine a business that does not have physical contracts, just virtual ones. All these are secure as long as somebody successfully cheats the consensus or exploits vulnerabilities in contrats. It may sound complicated for the first, but it is not...."
Link: https://cryptoctf.org/guide
