Prix du bitcoin (moyenne) à 02h00

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Bitcoin fête ses trois ans

Voici le billet datant du 01 novembre 2008 qui annonce la naissance de Bitcoin :

Bitcoin is a new design for a fully peer-to-peer electronic cash system. A C++ implementation is under development for release as an open source project.

Main properties :

– Double-spending is prevented with a peer-to-peer network.
– No mint or other trusted parties.
– Participants can be anonymous.

The network works in parallel to generate a chain of Hashcash style proof-of-work. The proof-of-work chain is the key to solving the Byzantine Generals’ Problem of synchronising the global view and generating computational proof of the majority consensus without having to trust anyone.

Paper : Bitcoin : A Peer-to-Peer Electronic Cash System

Abstract. A purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without the burdens of going through financial institutions. Digital signatures provide part of the solution, but the main benefits are lost if a trusted party is still required to prevent double-spending. We propose a solution to the double-spending problem using a peer-to-peer network. The network timestamps transactions by hashing them into an ongoing chain of hash-based proof-of-work, forming a record that cannot be changed without redoing the proof-of-work. The longest chain not only serves as proof of the sequence of events witnessed, but proof that it came from the largest pool of CPU power. As long as honest nodes control the most CPU power on the network, they can generate the longest chain and outpace any attackers. The network itself requires minimal structure. Messages are broadcasted on a best effort basis, and nodes can leave and rejoin the network at will, accepting the longest proof-of-work chain as proof of what happened while they were gone.

Satoshi Nakamoto