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Blockchain

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Veröffentlicht am

- Introduction a la blockchain
- Comment ça marche ?
- Avantages et limites

Veröffentlicht in: Technologie
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Blockchain

  1. 1. réalisé par : Othmani wael
  2. 2. Plan • Introduction a la blockchain • Comment ça marche ? • Avantages et limites
  3. 3. Introduction a la blockchain • Elle est annoncée comme la prochaine révolution celle qui vient après internet mais qu’est ce que la blockhain ? • La blockchain c’est d’abord une promesse celle de pouvoir se faire confiance sans se connaitre et sans intermédiaire. • La blockchain est une technologie de stockage et de transmission d’informations, transparente, sécurisée, et fonctionnant sans organe central de contrôle.
  4. 4. Comment ça marche ? • Pour y parvenir, la blcokchain propose de garder une trace indélébile de tout ce que l’on possède et s’échange dans un grand registre • vous voulez vendre un acte de propriété ! • changer de la monnaie ou voter électroniquement ! • vérifions dans la blockchain 
  5. 5. Comment ça marche ? • Ce registre est en réalité un système informatique composé de blocs qui représente toutes les transaction passées.
  6. 6. Comment ça marche ? • avant de valider votre nouvel échange, des machines vont scanner l’ensemble de la blockchian pour s’assurer que vous possédez bien ce que vous prétendez , une fois validé ce nouveau bloc vient s’ajouter dans la chaine.
  7. 7. Comment ça marche ? • Pour mieux comprendre son fonctionnement intéressons ,la meilleur illustration est le ‘bitcoin’ , cette monnaie virtuelle s’échange directement entre les utilisateurs via la blockchain
  8. 8. Si wassila veut donner son bitcoin a bilel : • Elle initie la transaction en utilisant sa clé privée • Envoie la somme a l’adresse publiques de bilel Bilel Clé publique (sorte d’adresse d’une boite a lettre) Clé privé (signature) Wassila
  9. 9. • l’ensemble de ces interactions et consignée dans la blockchain dont tous les utilisateurs peuvent avoir une copie • Pour sécurisé le système, des particuliers connectent leur machine sur le réseau on les appelle les mineurs, a l’aide du formule mathématique il vérifie dans la blockchain que bilel possède bien les bitcoin • Une foie vérifiée et validée notre transaction va s'inscrire dans le registre Cet historique de toutes les transactions effectuées indiquent : • la date • le montant • les clé publiques des deux utilisateurs mais pas leur identité réel BilelWassila
  10. 10. Avantages et limites de la blockchain
  11. 11. Merci pour votre attention

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