Concepts / Blockchain

A blockchain is a form of distributed ledger that organizes data into blocks and features an append-only structure, i.e. nothing can be edited or deleted after the fact.

The Bitcoin system was the first instance of a cryptocurrency blockchain, i.e. its design prevents Alice using the same single digital token to pay both Bob and Charlie (double-spending).

Ethereum is the first blockchain to feature a cryptocurrency and smart contract functionality.

There is a wide variety of blockchain designs.


Back to top