The history of digital money or cryptocurrency, which was built on decentralized architectures, without intermediary and without central authority, materialized by the Blockchain. 2 the evolution towards programmable Blockchains, allowing the design of new trust applications, of which Decentralized Finance (DeFi), self-sovereign identities, and the traceability of collaborative processes, are the 1st examples. 3/ Finally, we conclude with an analysis of the perspectives around Web 3 and its perimeter, which is likely to challenge the large centralized monopolies established by Internet giants.