﻿{"id":21650,"date":"2018-03-05T00:30:25","date_gmt":"2018-03-04T23:30:25","guid":{"rendered":"https:\/\/valoxy.org\/blog\/?p=21650"},"modified":"2024-06-13T16:12:39","modified_gmt":"2024-06-13T14:12:39","slug":"la-blockchain","status":"publish","type":"post","link":"https:\/\/valoxy.org\/blog\/la-blockchain\/","title":{"rendered":"La blockchain : d\u00e9finition et applications en entreprise"},"content":{"rendered":"<p>La blockchain est une nouvelle technologie de stockage et de transmission d\u2019informations. Elle est devenue tr\u00e8s populaire parce qu\u2019elle est \u00e9troitement li\u00e9e au bitcoin et \u00e0 l\u2019av\u00e8nement des crypto-monnaies. Ses applications vont cependant bien au-del\u00e0. La blockchain fait partie des technologies en passe de bouleverser des secteurs cl\u00e9s comme la banque ou l\u2019assurance, et nous n\u2019en sommes qu\u2019aux pr\u00e9mices !<\/p>\n<p>Mais alors, qu\u2019est-ce que la blockchain\u00a0? Quels sont ses applications et ses b\u00e9n\u00e9fices en entreprise\u00a0? Valoxy, cabinet d&rsquo;expertise comptable dans les Hauts de France, vous donne une vue d\u2019ensemble.<\/p>\n<p><span class=\"s1\"><div class=\"encadre-style\"><\/span><em>*Fintech\u00a0: condens\u00e9 de \u00ab\u00a0Finance\u00a0\u00bb et de \u00ab\u00a0Technologie\u00a0\u00bb &#8211; acronyme regroupant le march\u00e9 des start-up des nouvelles technologies sp\u00e9cialis\u00e9es dans les solutions innovantes \u00e0 destination du milieu bancaire et financier.<\/em><span class=\"s1\"><\/div><\/span><\/p>\n<h2><strong>\u00a0<\/strong>Les explications<\/h2>\n<p>Une \u00ab\u00a0<strong>blockchain<\/strong>\u00a0\u00bb (en anglais \u00ab\u00a0cha\u00eene de blocs\u00a0\u00bb) est une nouvelle technologie num\u00e9rique. Elle d\u00e9signe une base de donn\u00e9es capable de stocker et de transmettre des informations, de mani\u00e8re transparente et enti\u00e8rement s\u00e9curis\u00e9e (informations crypt\u00e9es), sans l\u2019intervention d\u2019aucun organe de contr\u00f4le. Dans une <strong>blockchain<\/strong>, tous les \u00e9changes qui ont \u00e9t\u00e9 r\u00e9alis\u00e9s sont en effet conserv\u00e9s au sein d\u2019un \u00ab\u00a0historique\u00a0\u00bb infalsifiable. Les \u00e9changes en question peuvent \u00eatre des transferts de fonds ou d\u2019actions, mais aussi des transferts d\u2019informations et des ordres pour l\u2019ex\u00e9cution automatique de contrats (\u00ab\u00a0smart contracts\u00a0\u00bb).<\/p>\n<p>On parle de <strong>blockchain<\/strong>, car les transactions qui sont effectu\u00e9es entre les utilisateurs sont regroup\u00e9es par bloc. Chaque bloc est valid\u00e9 et rendu infalsifiable par ce que l\u2019on appelle des n\u0153uds du r\u00e9seau, (c\u2019est \u00e0 dire toutes les machines composant le r\u00e9seau) en fonction de techniques variables selon la <strong>blockchain<\/strong>. La structure de la blockchain est d\u00e9centralis\u00e9e, car la base de donn\u00e9es n\u2019est pas h\u00e9berg\u00e9e par un serveur unique, mais par de nombreux \u00a0utilisateurs \u00e0 travers le monde. Aucun interm\u00e9diaire ne peut donc s\u2019immiscer dans une transaction pour en v\u00e9rifier la validit\u00e9, et, de plus, les informations contenues dans les blocs sont crypt\u00e9es, emp\u00eachant toute modification a posteriori.<\/p>\n<p>Lorsqu\u2019un bloc a \u00e9t\u00e9 valid\u00e9 (par plusieurs utilisateurs), il est ajout\u00e9 \u00e0 la cha\u00eene des blocs ant\u00e9rieurs. La transaction, devenue infalsifiable, est visible par le r\u00e9cepteur, mais aussi par l\u2019ensemble du r\u00e9seau de la cha\u00eene. Il existe des <strong>blockchains<\/strong> publiques et des <strong>blockchains<\/strong> priv\u00e9es, limit\u00e9es \u00e0 un certain nombre d\u2019utilisateurs.<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00ab\u00a0Imaginez un grand cahier impossible \u00e0 effacer\u00a0\u00bb<\/h3>\n<p>Pour aider \u00e0 la compr\u00e9hension, le math\u00e9maticien Jean-Paul Delahaye explique la <strong>blockchain<\/strong> comme suit\u00a0: \u00ab\u00a0<em>imaginez un tr\u00e8s grand cahier [un peu comme un grand livre de compte, NDLR] que tout le monde peut lire librement et gratuitement, sur lequel tout le monde peut \u00e9crire, mais qui est impossible \u00e0 effacer et indestructible<\/em>.\u00a0\u00bb<\/p>\n<h2>Les applications de la blockchain<\/h2>\n<p>La <strong>blockchain<\/strong> sert au transfert ultra s\u00e9curis\u00e9 de fonds, de titres financiers et d\u2019informations. Elle est utilis\u00e9e notamment dans le cadre de programmes d\u2019ex\u00e9cution <u>automatique<\/u> de contrats. Elle sert aussi de stockage de ces informations.<\/p>\n<h3>Le transfert de fonds<\/h3>\n<p>La <strong>blockchain <\/strong>du bitcoin repr\u00e9sente en fait la crypto-monnaie ainsi que son protocole de paiement, s\u00e9curis\u00e9 et infalsifiable. En th\u00e9orie, tout le monde peut acc\u00e9der \u00e0 la <strong>blockchain<\/strong> du bitcoin et acheter des biens et des services. (Dans la pratique, c\u2019est bien s\u00fbr un peu plus compliqu\u00e9\u00a0!). Les bitcoins peuvent ensuite \u00eatre \u00e9chang\u00e9s en devise (Euros, Dollars, etc.) sur des plateformes d\u2019\u00e9change, comme Paymium, par exemple.<\/p>\n<h3>Les \u00ab\u00a0smart contracts\u00a0\u00bb (contrats intelligents) gr\u00e2ce \u00e0 la blockchain de l\u2019Ethereum<\/h3>\n<p>La <strong>blockchain<\/strong> de l\u2019Ethereum va plus loin que des transactions. Elle permet de faire tourner ce que l\u2019on appelle des \u00ab smart contracts \u00bb (pour \u00ab contrats intelligents \u00bb). Les \u00ab smart contracts \u00bb sont des programmes informatiques capables de valider les crit\u00e8res de r\u00e9alisation d\u2019un contrat et d\u2019en d\u00e9clencher automatiquement l\u2019ex\u00e9cution, le cas \u00e9ch\u00e9ant. Ce sont par exemple les programmes d\u2019indemnisation des organismes d\u2019assurance. Ce type d\u2019outil analyse les sinistres pour d\u00e9clencher le proc\u00e9d\u00e9 d\u2019indemnisation adapt\u00e9 et personnalis\u00e9. Aucune intervention humaine \u00e0 un moment ou \u00e0 un autre du processus n&rsquo;est n\u00e9cessaire. Il fonctionne via une <strong>blockchain<\/strong> pour crypter le transfert des informations, le rendre fiable et enti\u00e8rement transparent.<\/p>\n<p>En 2017, Axa a lanc\u00e9 une assurance automatis\u00e9e bas\u00e9e sur la <strong>blockchain<\/strong>, baptis\u00e9e Fizzy, en partenariat avec la start-up Utocat. Le programme analyse en temps r\u00e9el les retards de vols en avion et indemnise automatiquement les souscripteurs concern\u00e9s.<\/p>\n<p>D\u2019autres programmes bas\u00e9s sur la <strong>blockchain<\/strong> sont \u00e0 l\u2019\u00e9tude, notamment dans le milieu bancaire. Le Cr\u00e9dit Agricole d\u00e9veloppe ainsi un programme appel\u00e9 Ripple charg\u00e9 d\u2019effectuer automatiquement les transferts d\u2019argent pour ses clients transfrontaliers. Ripple devrait permettre le virement d\u2019un salaire en francs suisses sur un compte bancaire en euros en quelques minutes seulement (contre 3 jours actuellement), de mani\u00e8re enti\u00e8rement s\u00e9curis\u00e9e et sans interm\u00e9diaire.<\/p>\n<h2>Le cadre juridique<\/h2>\n<p>En France, c\u2019est une ordonnance d\u2019avril 2017 qui donne pour la premi\u00e8re fois une place l\u00e9gale \u00e0 la <strong>blockchain<\/strong> dans les processus de transferts de fonds. Elle s\u2019inscrit \u00e0 l\u2019article L223-12 du Code Mon\u00e9taire et Financier. Sa d\u00e9finition : \u00ab <em>un dispositif d\u2019enregistrement \u00e9lectronique partag\u00e9 permettant l\u2019authentification d\u2019op\u00e9rations sur titres sp\u00e9cifiques, destin\u00e9s \u00e0 \u00eatre \u00e9chang\u00e9s sur les plateformes de financement participatif\u00a0: les minibons.<\/em> \u00bb En d\u00e9cembre 2017, une autre ordonnance autorise la <strong>blockchain<\/strong> comme moyen l\u00e9gal pour transf\u00e9rer la propri\u00e9t\u00e9 de certains titres financiers. C\u2019est une grande premi\u00e8re en Europe et un sacr\u00e9 coup donn\u00e9 aux institutions bancaires traditionnelles. Cette nouvelle perspective devrait pousser les acteurs de la Fintech* \u00e0 trouver des solutions toujours plus innovantes en mati\u00e8re de transferts, de nantissement, de paiements num\u00e9riques, etc.<\/p>\n<p>L\u2019Union europ\u00e9enne a cr\u00e9\u00e9 un observatoire de la <strong>blockchain<\/strong>\u00a0 pour favoriser l\u2019utilisation de cette nouvelle technologie aupr\u00e8s de tous les citoyens de l\u2019UE. De belles perspectives sont \u00e0 venir !<\/p>\n<p class=\"p1\"><span class=\"s1\">Pour plus d\u2019informations sur la <b>blockchain<\/b>, retrouvez nos articles sur le blog Valoxy\u00a0:<\/span><\/p>\n<ul class=\"ul1\">\n<li class=\"li1\"><a href=\"https:\/\/valoxy.org\/blog\/petit-lexique-des-startuppeurs\/\"><span class=\"s2\">Petit lexique des startuppeurs<\/span><\/a><\/li>\n<li class=\"li2\"><span class=\"s3\"><a href=\"https:\/\/valoxy.org\/blog\/le-bitcoin-est-il-fait-pour-les-entreprises\/\"><span class=\"s4\">Le Bitcoin est-il fait pour les entreprises ?<\/span><\/a><\/span><\/li>\n<li class=\"li2\"><span class=\"s3\"><a href=\"https:\/\/valoxy.org\/blog\/limposition-monnaies-virtuelles-bitcoin\/\"><span class=\"s4\">L\u2019imposition des monnaies virtuelles : le cas du Bitcoin<\/span><\/a><\/span><\/li>\n<li class=\"li2\"><span class=\"s3\"><a href=\"https:\/\/valoxy.org\/blog\/lico-lever-fonds-crypto-monnaie\/\"><span class=\"s4\">L\u2019ICO pour lever des fonds en crypto-monnaie<\/span><\/a><\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>La blockchain est une nouvelle technologie de stockage et de transmission d\u2019informations. Elle est devenue tr\u00e8s populaire parce qu\u2019elle est \u00e9troitement li\u00e9e au bitcoin et \u00e0 l\u2019av\u00e8nement des crypto-monnaies. Ses applications vont cependant bien au-del\u00e0. La blockchain fait partie des&#8230;<\/p>\n","protected":false},"author":1,"featured_media":64726,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,8],"tags":[],"class_list":["post-21650","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gestion","category-it-marketing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La blockchain : d\u00e9finition et applications en entreprise | Blog Valoxy - Expertise comptable<\/title>\n<meta name=\"description\" content=\"La blockchain est une nouvelle technologie de stockage et de transmission d\u2019informations devenue tr\u00e8s populaire parce qu\u2019elle est \u00e9troitement li\u00e9e au bitcoin et \u00e0 l\u2019av\u00e8nement des crypto-monnaies.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/valoxy.org\/blog\/la-blockchain\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La blockchain : d\u00e9finition et applications en entreprise | Blog Valoxy - Expertise comptable\" \/>\n<meta property=\"og:description\" content=\"La blockchain est une nouvelle technologie de stockage et de transmission d\u2019informations devenue tr\u00e8s populaire parce qu\u2019elle est \u00e9troitement li\u00e9e au bitcoin et \u00e0 l\u2019av\u00e8nement des crypto-monnaies.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/valoxy.org\/blog\/la-blockchain\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog Valoxy - Expertise comptable\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Valoxy\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-04T23:30:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-13T14:12:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/valoxy.org\/blog\/wp-content\/uploads\/2018\/03\/definition-de-la-blockchain-scaled-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1435\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Expert-comptable Valoxy\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Expert-comptable Valoxy\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/valoxy.org\/blog\/la-blockchain\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/valoxy.org\/blog\/la-blockchain\/\"},\"author\":{\"name\":\"Expert-comptable Valoxy\",\"@id\":\"https:\/\/valoxy.org\/blog\/#\/schema\/person\/d285f250195f45509ceac046366fcc4a\"},\"headline\":\"La blockchain : d\u00e9finition et applications en entreprise\",\"datePublished\":\"2018-03-04T23:30:25+00:00\",\"dateModified\":\"2024-06-13T14:12:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/valoxy.org\/blog\/la-blockchain\/\"},\"wordCount\":1084,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/valoxy.org\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/valoxy.org\/blog\/la-blockchain\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/valoxy.org\/blog\/wp-content\/uploads\/2018\/03\/definition-de-la-blockchain-scaled-1.jpg\",\"articleSection\":[\"Gestion\",\"It-marketing\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/valoxy.org\/blog\/la-blockchain\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/valoxy.org\/blog\/la-blockchain\/\",\"url\":\"https:\/\/valoxy.org\/blog\/la-blockchain\/\",\"name\":\"La blockchain : d\u00e9finition et applications en entreprise | Blog Valoxy - 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