{"id":37245,"date":"2026-05-29T09:54:35","date_gmt":"2026-05-29T09:54:35","guid":{"rendered":"https:\/\/volity.io\/non-classifiee\/what-is-proof-of-work\/"},"modified":"2026-06-04T06:24:12","modified_gmt":"2026-06-04T06:24:12","slug":"what-is-proof-of-work","status":"publish","type":"post","link":"https:\/\/volity.io\/fr\/glossaire\/what-is-proof-of-work\/","title":{"rendered":"Qu&rsquo;est-ce que la preuve de travail (Proof of Work)"},"content":{"rendered":"<h2>Comment fonctionne la preuve de travail<\/h2>\n<p>La preuve de travail est le m\u00e9canisme de consensus qui permet \u00e0 une blockchain de s&rsquo;accorder sur son historique sans autorit\u00e9 centrale. Les mineurs s&rsquo;affrontent pour r\u00e9soudre une \u00e9nigme cryptographique difficile \u00e0 calculer mais triviale \u00e0 v\u00e9rifier ; le premier \u00e0 la r\u00e9soudre ajoute le bloc suivant et gagne la r\u00e9compense. Comme r\u00e9soudre l&rsquo;\u00e9nigme co\u00fbte de l&rsquo;\u00e9lectricit\u00e9 et du mat\u00e9riel r\u00e9els, r\u00e9\u00e9crire d&rsquo;anciens blocs reviendrait \u00e0 surpasser en d\u00e9pense tout le r\u00e9seau honn\u00eate, ce qui rend la cha\u00eene r\u00e9sistante \u00e0 la falsification.<\/p>\n<h2>Exemple chiffr\u00e9<\/h2>\n<p>Bitcoin vise un bloc environ toutes les dix minutes. Si plus de mat\u00e9riel de <a href=\"https:\/\/volity.io\/fr\/glossaire\/what-is-mining-in-crypto\/\">minage<\/a> rejoint, le protocole rel\u00e8ve la difficult\u00e9 pour tenir ce rythme ; s&rsquo;il en part, la difficult\u00e9 baisse. Cette difficult\u00e9 auto-ajust\u00e9e explique pourquoi les temps de bloc restent stables sur des d\u00e9cennies de participation changeante, et pourquoi un attaquant aurait besoin d&rsquo;une majorit\u00e9 de la puissance de hachage mondiale pour menacer la cha\u00eene.<\/p>\n<h2>Preuve de travail ou preuve d&rsquo;enjeu<\/h2>\n<p>La preuve de travail ach\u00e8te la s\u00e9curit\u00e9 avec de l&rsquo;\u00e9nergie ; la <a href=\"https:\/\/volity.io\/fr\/glossaire\/what-is-proof-of-stake\/\">preuve d&rsquo;enjeu<\/a> l&rsquo;ach\u00e8te avec du capital verrouill\u00e9 et le slashing. Bitcoin reste en preuve de travail ; Ethereum est pass\u00e9 \u00e0 la preuve d&rsquo;enjeu en 2022. Le d\u00e9bat est r\u00e9el : la preuve de travail a le plus long bilan de s\u00e9curit\u00e9, la preuve d&rsquo;enjeu consomme une fraction de l&rsquo;\u00e9nergie.<\/p>\n<h2>Pourquoi c&rsquo;est important<\/h2>\n<p>Le mod\u00e8le de consensus fa\u00e7onne l&rsquo;\u00e9mission, le profil \u00e9nerg\u00e9tique et le r\u00e9cit de d\u00e9centralisation d&rsquo;un coin, autant d&rsquo;\u00e9l\u00e9ments de son dossier d&rsquo;investissement de long terme. Quand vous prenez une exposition spot ou CFD \u00e0 un coin en preuve de travail sur Volity, le calendrier de halving et l&rsquo;\u00e9conomie des mineurs font partie du contexte fondamental. \u00c0 lire aussi : <a href=\"https:\/\/volity.io\/fr\/glossaire\/what-is-bitcoin-halving\/\">le halving du Bitcoin<\/a>.<\/p>\n<p>Pour aller plus loin, voir notre page <a href=\"https:\/\/volity.io\/fr\/crypto\/\">crypto<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Comment fonctionne la preuve de travail La preuve de travail est le m\u00e9canisme de consensus qui permet \u00e0 une blockchain de s&rsquo;accorder [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":37944,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"custom_schema":"","footnotes":""},"categories":[258],"tags":[],"class_list":["post-37245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Qu&#039;est-ce que la preuve de travail (Proof of Work)<\/title>\n<meta name=\"description\" content=\"La preuve de travail s\u00e9curise une blockchain en faisant d\u00e9penser de l&#039;\u00e9nergie computationnelle. 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