- The main crypto-transaction system, called Blockchain, consists of a shared ledger organized in blocks. Each block contains a series of transactions protected by digital signatures and it’s validated through the resolution of a complex mathematical problem.

- Peer to peer networks, cryptographic hash function SHA 256 and Proof of work protocol garantee the security of the system.

- Miners listen to transactions, create blocks, broadcast blocks to other nodes and gain bitcoins in reward.

- As long as the majority of cpu power is controlled by nodes that are not cooperating to attack the network, they’ll generate the longest chain and neutralize attackers.

- Currently, there are more than 900 cryptocurrencies around the world but technology and digital infrastructures are giving us enough power for developing different kinds of cryptocurrencies.

- The economic situation between 2017 and 2019 of all the crypto tokens shows us non classical variations in terms of market cap and nominal value due to the fragility of the system itself.

- To work as they should some cryptocurrencies (as the Bitcoin, for example) are “released” with a fixed amount, which decreases over time, by the system every validated block.