{"id":37261,"date":"2026-05-29T09:59:06","date_gmt":"2026-05-29T09:59:06","guid":{"rendered":"https:\/\/volity.io\/non-classifiee\/what-is-l1-vs-l2\/"},"modified":"2026-05-29T10:00:12","modified_gmt":"2026-05-29T10:00:12","slug":"what-is-l1-vs-l2","status":"publish","type":"post","link":"https:\/\/volity.io\/fr\/glossaire\/what-is-l1-vs-l2\/","title":{"rendered":"Qu&rsquo;est-ce que la Layer 1 vs Layer 2"},"content":{"rendered":"<h2>Comment \u00e7a fonctionne<\/h2>\n<p>Les cha\u00eenes Layer 1 font tourner leurs propres validateurs et finalisent leurs propres transactions. Les r\u00e9seaux Layer 2 groupent de nombreuses transactions utilisateur hors de la cha\u00eene principale, calculent le r\u00e9sultat et postent une preuve compacte ou un r\u00e9sum\u00e9 en retour sur la Layer 1. La Layer 1 h\u00e9rite la s\u00e9curit\u00e9 ; la Layer 2 h\u00e9rite l&rsquo;\u00e9chelle. Les architectures Layer 2 majeures incluent les optimistic rollups (Arbitrum, Optimism, Base), les zk-rollups (zkSync, Starknet) et les canaux d&rsquo;\u00e9tat.<\/p>\n<h2>Exemple<\/h2>\n<p>Un swap sur Ethereum mainnet co\u00fbte 5 \u00e0 30 $ en gas en conditions normales. Le m\u00eame swap sur Arbitrum (une Layer 2) co\u00fbte environ 0,10 $ et se confirme en 1 seconde au lieu de 12. Arbitrum poste p\u00e9riodiquement un lot de transactions en retour sur Ethereum, o\u00f9 il b\u00e9n\u00e9ficie de la s\u00e9curit\u00e9 d&rsquo;Ethereum. Si les op\u00e9rateurs d&rsquo;Arbitrum tombent, les utilisateurs peuvent toujours retirer leurs fonds vers la Layer 1 via une preuve sur la cha\u00eene.<\/p>\n<h2>Pourquoi c&rsquo;est important<\/h2>\n<p>Le d\u00e9bit Layer 1 est fondamentalement contraint par le co\u00fbt d&rsquo;exploitation de validateurs ind\u00e9pendants. La Layer 2 contourne cette contrainte tout en h\u00e9ritant la s\u00e9curit\u00e9 Layer 1. La plupart des utilisateurs crypto actifs d\u00e9tiennent et tradent d\u00e9sormais sur Layer 2 pour \u00e9chapper aux frais Layer 1. Le compromis est la fragmentation : liquidit\u00e9, soldes et applications r\u00e9partis sur des dizaines de Layer 2 et ponts, avec une complexit\u00e9 op\u00e9rationnelle pour les utilisateurs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Comment \u00e7a fonctionne Les cha\u00eenes Layer 1 font tourner leurs propres validateurs et finalisent leurs propres transactions. Les r\u00e9seaux Layer 2 groupent [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":37942,"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-37261","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 v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Qu&#039;est-ce que la Layer 1 vs Layer 2<\/title>\n<meta name=\"description\" content=\"La Layer 1 est une blockchain de base r\u00e9glant ses propres transactions. 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