{"id":46651,"date":"2026-07-19T13:48:54","date_gmt":"2026-07-19T13:48:54","guid":{"rendered":"https:\/\/volity.io\/blog\/stablecoin-fight-usdc-open-usd-2\/"},"modified":"2026-07-19T21:08:51","modified_gmt":"2026-07-19T21:08:51","slug":"stablecoin-fight-usdc-open-usd","status":"publish","type":"post","link":"https:\/\/volity.io\/fr\/actualites\/stablecoin-fight-usdc-open-usd\/","title":{"rendered":"La bataille des stablecoins s&rsquo;intensifie alors qu&rsquo;Open USD menace l&rsquo;USDC"},"content":{"rendered":"<h2>Le nouveau bras de fer de la crypto : confidentialit\u00e9, paiements et bataille des stablecoins<\/h2>\n\n<p>Les march\u00e9s crypto paraissent calmes \u00e0 l&rsquo;\u00e9cran. En dessous, pourtant, la tuyauterie est arrach\u00e9e puis reconstruite.<\/p>\n\n<p>Zcash pr\u00e9pare un hard fork pour d\u00e9fendre son mod\u00e8le de confidentialit\u00e9 apr\u00e8s une s\u00e9rieuse alerte sur le risque d&rsquo;offre. Pendant ce temps, Wall Street et la Silicon Valley poussent les tokens en dollars plus loin dans les paiements. Un nouveau stablecoin soutenu par un consortium, Open USD, vise \u00e9galement l&rsquo;USDC de Circle.<\/p>\n\n<p>Pour les traders, le message est sans d\u00e9tour. Le prochain cycle crypto pourrait d\u00e9pendre moins de l&rsquo;engouement m\u00e9m\u00e9tique que de l&rsquo;infrastructure. La s\u00e9curit\u00e9, la vitesse de settlement et la distribution des stablecoins occupent d\u00e9sormais le centre du march\u00e9.<\/p>\n\n<h3>Zcash pr\u00e9pare un hard fork apr\u00e8s une alerte de confidentialit\u00e9<\/h3>\n\n<p>Zcash, l&rsquo;un des plus anciens projets de confidentialit\u00e9 de la crypto, fait face \u00e0 un test critique le 28 juillet. Le r\u00e9seau pr\u00e9voit d&rsquo;activer Ironwood, un hard fork con\u00e7u pour contenir le risque li\u00e9 \u00e0 une faille dans son shielded pool Orchard.<\/p>\n\n<p>Le probl\u00e8me touchait au c\u0153ur de la monnaie priv\u00e9e. Fin mai, le chercheur en s\u00e9curit\u00e9 Taylor Hornby a r\u00e9v\u00e9l\u00e9 une vuln\u00e9rabilit\u00e9 qui aurait pu permettre de cr\u00e9er de faux ZEC au sein d&rsquo;Orchard. Parce qu&rsquo;Orchard masque les d\u00e9tails des transactions, tout abus aurait \u00e9t\u00e9 difficile \u00e0 rep\u00e9rer on-chain.<\/p>\n\n<p>Les d\u00e9veloppeurs ont r\u00e9agi vite. D&rsquo;abord, ils ont d\u00e9sactiv\u00e9 l&rsquo;activit\u00e9 d&rsquo;Orchard. Ensuite, en juin, ils ont d\u00e9ploy\u00e9 une mise \u00e0 jour d&rsquo;urgence pour corriger la cryptographie. Des revues ind\u00e9pendantes n&rsquo;ont depuis trouv\u00e9 aucune preuve d&rsquo;exploitation.<\/p>\n\n<p>Pourtant, la confidentialit\u00e9 cr\u00e9e un probl\u00e8me comptable d\u00e9licat. Un registre transparent peut prouver ce qui s&rsquo;est pass\u00e9. Un shielded pool ne prouve souvent que ce que sa conception autorise. Par cons\u00e9quent, Zcash ne peut pas affirmer avec une certitude absolue qu&rsquo;aucune pi\u00e8ce contrefaite n&rsquo;a jamais exist\u00e9.<\/p>\n\n<p>Ironwood est la r\u00e9ponse du r\u00e9seau. Plut\u00f4t que de chercher des fant\u00f4mes, le fork vise \u00e0 verrouiller l&rsquo;ancien pool et \u00e0 r\u00e9tablir la confiance ailleurs.<\/p>\n\n<ul>\n  <li><b>Ancien pool Orchard :<\/b> scell\u00e9 pour emp\u00eacher des fonds sans restriction d&rsquo;en sortir.<\/li>\n  <li><b>M\u00e9canisme turnstile :<\/b> utilis\u00e9 pour contr\u00f4ler la quantit\u00e9 de ZEC pouvant passer en circulation transparente.<\/li>\n  <li><b>Nouveau shielded pool :<\/b> introduit avec des contr\u00f4les renforc\u00e9s autour de l&rsquo;int\u00e9grit\u00e9 de l&rsquo;offre.<\/li>\n<\/ul>\n\n<p>Pour les investisseurs, l&rsquo;\u00e9pisode offre \u00e0 la fois du r\u00e9confort et un avertissement. D&rsquo;un c\u00f4t\u00e9, Zcash a coordonn\u00e9 un correctif s\u00e9rieux en quelques semaines. De l&rsquo;autre, les syst\u00e8mes priv\u00e9s comportent des risques qui ne peuvent pas \u00eatre audit\u00e9s comme des blockchains ordinaires.<\/p>\n\n<p>Cette distinction compte davantage aujourd&rsquo;hui. Les privacy coins ne vivent plus seulement sur des forums id\u00e9ologiques. Ils figurent dans les carnets des exchanges, apparaissent dans des produits de conservation et attirent l&rsquo;attention des fonds lorsque les craintes de surveillance montent.<\/p>\n\n<h3>Les stablecoins passent de jetons de trading aux payment rails<\/h3>\n\n<p>La bataille la plus bruyante se joue dans les stablecoins. L&rsquo;USDC de Circle a pass\u00e9 deux ans \u00e0 b\u00e2tir une r\u00e9putation de token en dollars r\u00e9glement\u00e9 de r\u00e9f\u00e9rence. Les banques, les soci\u00e9t\u00e9s de paiement et les g\u00e9rants d&rsquo;actifs ont appr\u00e9ci\u00e9 ses habitudes de transparence et sa posture de conformit\u00e9.<\/p>\n\n<p>Cela a aid\u00e9 l&rsquo;USDC \u00e0 gagner du terrain dans l&rsquo;activit\u00e9 r\u00e9elle. Des donn\u00e9es de march\u00e9 r\u00e9centes placent l&rsquo;USDC pr\u00e8s de 70 % du volume de transactions de stablecoins ajust\u00e9. L&rsquo;USDT de Tether, encore bien plus important en valeur de march\u00e9, se situe plus proche de 25 % selon cette mesure.<\/p>\n\n<p>Cependant, le succ\u00e8s attire de plus grands rivaux. Le 30 juin, un groupe de plus de 140 entreprises a lanc\u00e9 Open USD, connu sous le nom d&rsquo;OUSD. Les soutiens couvrent les paiements, la gestion d&rsquo;actifs, la technologie et les plateformes crypto.<\/p>\n\n<ul>\n  <li><b>Paiements :<\/b> Visa, Mastercard et Stripe figurent parmi les entreprises impliqu\u00e9es.<\/li>\n  <li><b>Gestion d&rsquo;actifs :<\/b> BlackRock apporte au projet un poids institutionnel.<\/li>\n  <li><b>Plateformes :<\/b> Coinbase, Google, Shopify et d&rsquo;autres ajoutent une force de distribution.<\/li>\n<\/ul>\n\n<p>L&rsquo;argumentaire diff\u00e8re du mod\u00e8le de Circle. L&rsquo;USDC est \u00e9mis par une seule entreprise, qui conserve une partie des revenus de la r\u00e9serve. Circle utilise ces revenus pour financer licences, infrastructure et croissance.<\/p>\n\n<p>OUSD, \u00e0 l&rsquo;inverse, utilise une structure de consortium. Les revenus de la r\u00e9serve reviennent vers les partenaires participants. Par cons\u00e9quent, les entreprises qui distribuent le token peuvent participer plus directement \u00e0 son \u00e9conomie.<\/p>\n\n<p>Ce mod\u00e8le r\u00e9pond \u00e0 une frustration discr\u00e8te au sein des paiements. Les stablecoins se r\u00e8glent d\u00e9sormais \u00e0 toute heure, au-del\u00e0 des fronti\u00e8res et entre les cha\u00eenes. Les r\u00e9seaux de cartes s&rsquo;appuient encore sur des syst\u00e8mes plus anciens, pleins de fen\u00eatres de traitement par lots, d&rsquo;interm\u00e9diaires et de coupures de week-end.<\/p>\n\n<p>Cela ne signifie pas que Visa ou Mastercard disparaissent. Loin de l\u00e0. Au contraire, les stablecoins ressemblent de plus en plus \u00e0 des moteurs de settlement que les r\u00e9seaux existants peuvent envelopper, marquer et mon\u00e9tiser.<\/p>\n\n<h3>Circle subit la pression de son propre avenir<\/h3>\n\n<p>Le d\u00e9fi de Circle est inconfortable parce que sa th\u00e8se fonctionne. L&rsquo;USDC est devenu un rouage s\u00e9rieux de la plomberie financi\u00e8re. Pourtant, ce succ\u00e8s donne aux partenaires une raison de r\u00e9clamer une plus grande part de l&rsquo;\u00e9conomie.<\/p>\n\n<p>Mizuho a r\u00e9cemment abaiss\u00e9 son opinion sur Circle, pointant un ralentissement de la croissance de la capitalisation de l&rsquo;USDC et une concurrence croissante. L&rsquo;inqui\u00e9tude est simple. Si un token de consortium soutenu par de grands partenaires prend de l&rsquo;ampleur, les marges de Circle pourraient se r\u00e9duire.<\/p>\n\n<p>Malgr\u00e9 tout, cette pression peut aussi valider le march\u00e9 de Circle. Davantage de projets de stablecoins s\u00e9rieux signifie davantage de demande de dollars num\u00e9riques r\u00e9glement\u00e9s. Dans ce cas, le secteur grandit, tandis que les poches de profit se r\u00e9partissent entre plus de mains.<\/p>\n\n<p>Les traders devraient surveiller le volume, pas les communiqu\u00e9s de presse. Les premiers signaux utiles viendront des listings sur les exchanges, des flux marchands, des pools DeFi et des int\u00e9grations de tr\u00e9sorerie d&rsquo;entreprise. Si OUSD n&rsquo;appara\u00eet que dans les annonces, cela reste du th\u00e9\u00e2tre. Si la liquidit\u00e9 suit, la carte change.<\/p>\n\n<h3>La r\u00e9glementation devient une arme de distribution<\/h3>\n\n<p>La politique fa\u00e7onne d\u00e9sormais le march\u00e9 des stablecoins autant que le code. Aux \u00c9tats-Unis, le GENIUS Act a cr\u00e9\u00e9 un cadre pour les stablecoins de paiement et les tokens num\u00e9riques li\u00e9s \u00e0 des transactions. Cette clart\u00e9 a encourag\u00e9 de grandes institutions \u00e0 explorer les tokens en dollars r\u00e9glement\u00e9s.<\/p>\n\n<p>Pendant ce temps, le r\u00e9gime MiCA en Europe a r\u00e9compens\u00e9 les \u00e9metteurs qui ont obtenu leur autorisation. L&rsquo;USDC a profit\u00e9 de ce changement. L&rsquo;USDT a subi des retraits de cotation sur certaines places o\u00f9 l&rsquo;approbation r\u00e9glementaire a tard\u00e9.<\/p>\n\n<p>En cons\u00e9quence, la comp\u00e9tition des stablecoins comporte d\u00e9sormais trois niveaux. Vient d&rsquo;abord la qualit\u00e9 de la r\u00e9serve. Vient ensuite la distribution de paiement. Vient enfin l&rsquo;acc\u00e8s r\u00e9glementaire.<\/p>\n\n<p>Le token gagnant n&rsquo;offrira peut-\u00eatre pas la meilleure technologie. Ce sera plut\u00f4t celui d\u00e9j\u00e0 int\u00e9gr\u00e9 dans les banques, les logiciels de paie, les outils marchands et les r\u00e9seaux de cartes.<\/p>\n\n<p>C&rsquo;est pourquoi de nombreux utilisateurs avertis s&rsquo;orientent vers des configurations multi-\u00e9metteurs. Une entreprise peut cr\u00e9er de l&rsquo;USDC via Circle, recourir \u00e0 un autre fournisseur pour les rampes fiat, acheminer des fonds entre les cha\u00eenes et d\u00e9tenir des wallets via des soci\u00e9t\u00e9s d&rsquo;infrastructure int\u00e9gr\u00e9e. L&rsquo;utilisateur voit un solde en dollars. Derri\u00e8re le rideau, plusieurs r\u00e9seaux font le travail.<\/p>\n\n<h3>En chiffres<\/h3>\n\n<ul>\n  <li><b>28 juillet :<\/b> date d&rsquo;activation pr\u00e9vue pour le hard fork Ironwood de Zcash.<\/li>\n  <li><b>Fin mai :<\/b> fen\u00eatre de divulgation de la vuln\u00e9rabilit\u00e9 du shielded pool Orchard.<\/li>\n  <li><b>Juin :<\/b> correctif cryptographique d&rsquo;urgence d\u00e9ploy\u00e9 pour Zcash.<\/li>\n  <li><b>30 juin :<\/b> date de lancement annonc\u00e9e pour Open USD.<\/li>\n  <li><b>Environ 70 % :<\/b> part de l&rsquo;USDC dans le volume de transactions de stablecoins ajust\u00e9.<\/li>\n<\/ul>\n\n<h3>Ce que les traders devraient surveiller<\/h3>\n\n<ol>\n  <li><b>Confiance dans l&rsquo;offre de ZEC :<\/b> surveillez le fork Ironwood, le soutien des exchanges et la liquidit\u00e9 post-fork.<\/li>\n  <li><b>Adoption d&rsquo;OUSD :<\/b> les listings, les int\u00e9grations marchandes et les pools DeFi comptent plus que les logos des partenaires.<\/li>\n  <li><b>Marges de Circle :<\/b> une croissance plus rapide des stablecoins peut tout de m\u00eame s&rsquo;accompagner d&rsquo;une \u00e9conomie plus faible.<\/li>\n  <li><b>Acc\u00e8s de l&rsquo;USDT :<\/b> les d\u00e9cisions des places europ\u00e9ennes pourraient continuer \u00e0 d\u00e9placer la liquidit\u00e9 vers des rivaux autoris\u00e9s.<\/li>\n  <li><b>Payment rails :<\/b> le vrai combat porte sur le volume de settlement, pas sur l&rsquo;image de marque du token.<\/li>\n<\/ol>\n\n<p>Le dernier combat de la crypto ne se joue pas seulement sur les graphiques de prix. Il se joue dans les shielded pools, les syst\u00e8mes de settlement et les d\u00e9finitions juridiques. Les r\u00e9seaux de confidentialit\u00e9 veulent prouver qu&rsquo;ils peuvent rester priv\u00e9s sans rompre la confiance dans l&rsquo;offre. Les \u00e9metteurs de stablecoins veulent devenir le dollar par d\u00e9faut du commerce mondial.<\/p>\n\n<p>Pendant ce temps, les plus grandes entreprises de la finance ne se demandent plus si la monnaie tokenis\u00e9e compte. Elles se demandent qui est pay\u00e9 lorsqu&rsquo;elle circule.<\/p>\n\n\n<h2 class=\"wp-block-heading volity-related-coverage\">Articles connexes sur Volity<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/volity.io\/fr\/?p=45360\">Comment \u00e9viter les arnaques crypto : liste de s\u00e9curit\u00e9 pour d\u00e9butants<\/a><\/li>\n<li><a href=\"https:\/\/volity.io\/fr\/trading-platforms-fr\/how-to-choose-a-trading-platform\/\">Comment choisir une plateforme de trading : une liste de v\u00e9rification en 10 points<\/a><\/li>\n<li><a href=\"https:\/\/volity.io\/fr\/trader\/demo-vs-live-trading-account\/\">D\u00e9mo vs compte de trading r\u00e9el : une liste de v\u00e9rification en 7 \u00e9tapes avant de passer en direct<\/a><\/li>\n<li><a href=\"https:\/\/volity.io\/fr\/trader\/position-sizing-risk-per-trade\/\">Comment dimensionner un trade : taille de position et risque par trade pour d\u00e9butants<\/a><\/li>\n<li><a href=\"https:\/\/volity.io\/fr\/trader\/risk-reward-ratio-explained\/\">Ratio risque-rendement expliqu\u00e9 : comment le d\u00e9finir et pourquoi il compte<\/a><\/li>\n<li><a href=\"https:\/\/volity.io\/fr\/actions\/etf-vs-index-fund\/\">ETF vs fonds indiciel : la diff\u00e9rence et lequel choisir<\/a><\/li>\n<\/ul>\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"NewsArticle\",\"headline\":\"La bataille des stablecoins s'intensifie alors qu'Open USD menace l'USDC\",\"datePublished\":\"2026-07-19T13:48:54+00:00\",\"dateModified\":\"2026-07-19T13:48:54+00:00\",\"author\":{\"@type\":\"Person\",\"name\":\"Alexander Bennett\",\"url\":\"https:\/\/volity.io\/\"},\"publisher\":{\"@type\":\"Organization\",\"name\":\"Volity\",\"url\":\"https:\/\/volity.io\/\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/volity.io\/wp-content\/uploads\/2026\/03\/logo.webp\",\"width\":512,\"height\":512}},\"image\":\"https:\/\/volity.io\/wp-content\/uploads\/2026\/07\/StablecoinFight.webp\",\"mainEntityOfPage\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/volity.io\/fr\/news\/stablecoin-fight-usdc-open-usd\/\"},\"articleSection\":\"News\",\"inLanguage\":\"fr\"}<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Le nouveau bras de fer de la crypto : confidentialit\u00e9, paiements et bataille des stablecoins Les march\u00e9s crypto paraissent calmes \u00e0 l&rsquo;\u00e9cran. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":46532,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"custom_schema":"","footnotes":""},"categories":[223],"tags":[41],"class_list":["post-46651","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-trading"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La bataille des stablecoins s&#039;intensifie alors qu&#039;Open USD menace l&#039;USDC | Volity<\/title>\n<meta name=\"description\" content=\"Un consortium de 140 entreprises lance Open USD (OUSD) pour defier l&#039;USDC de Circle, qui detient environ 70% du volume stablecoin ajuste ; plus le hard\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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