{"id":9605,"date":"2025-09-20T09:00:59","date_gmt":"2025-09-20T09:00:59","guid":{"rendered":"https:\/\/icobench.com\/fr\/?p=9605"},"modified":"2025-09-18T11:12:12","modified_gmt":"2025-09-18T11:12:12","slug":"faille-cross-chain-crypto","status":"publish","type":"post","link":"https:\/\/icobench.com\/fr\/news\/faille-cross-chain-crypto\/","title":{"rendered":"Cross-chain bridges : la faille b\u00e9ante de la crypto qui co\u00fbte des milliards"},"content":{"rendered":"<p>Le blanchiment crypto a chang\u00e9 d\u2019\u00e9chelle. Ce n\u2019est plus une affaire de mixers isol\u00e9s, mais de trajectoires \u00e9clat\u00e9es entre blockchains, DEX, agr\u00e9gateurs et services d\u2019\u00e9change anonymes. Selon des estimations publi\u00e9es cette semaine, au moins 21,8 milliards de dollars de flux illicites ou \u00e0 haut risque auraient transit\u00e9 via des swaps cross-chain, soit une <strong>envol\u00e9e d\u2019environ 211 %<\/strong> en deux ans.<\/p>\n<p>La multiplication des r\u00e9seaux, des passerelles et des outils multicha\u00eenes ouvre autant de portes aux enqu\u00eateurs qu\u2019aux fraudeurs. Cette \u00e9volution fait \u00e9cho aux analyses disponibles sur <a href=\"https:\/\/icobench.com\/fr\/news\/address-poisoning-arnaque-crypto-revient-mode\/\" rel=\"\">les nouvelles formes d\u2019arnaques crypto<\/a> qui prolif\u00e8rent dans l\u2019\u00e9cosyst\u00e8me d\u00e9centralis\u00e9.<\/p>\n<h2><span id=\"les_bridges_autoroutes_du_chain-hopping\">Les bridges, autoroutes du \u00ab\u00a0chain-hopping\u00a0\u00bb<\/span><\/h2>\n<p>Les sch\u00e9mas que pointent les experts deviennent classiques. Le chain-hopping structur\u00e9 consiste \u00e0 scinder un butin et \u00e0 le disperser simultan\u00e9ment sur plusieurs cha\u00eenes. En parall\u00e8le, le multi-hop ajoute des rebonds successifs, d\u2019un r\u00e9seau \u00e0 l\u2019autre, pour casser la <strong>tra\u00e7abilit\u00e9<\/strong>.<\/p>\n<p>D\u00e9but 2025, un vol de 75 millions de dollars que les enqu\u00eateurs attribuent \u00e0 des acteurs nord-cor\u00e9ens pr\u00e9sum\u00e9s a suivi un parcours typique: Bitcoin puis Ethereum, avant Arbitrum, Base et enfin Tron. Dans un dossier plus modeste au Royaume-Uni, un fraudeur a fragment\u00e9 environ 200 000 dollars sur 90 actifs et plusieurs cha\u00eenes pour alimenter du jeu en ligne. Ces itin\u00e9raires paraissent inefficients, c\u2019est pr\u00e9cis\u00e9ment le but: saturer les analystes et faire tr\u00e9bucher les outils de <strong>d\u00e9tection<\/strong>.<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">\ud83d\udca5 Cross-chain crime has surged to $22 billion \u2014 and it\u2019s accelerating<\/p>\n<p>Our latest report, The state of cross-chain crime 2025, reveals how threat actors are increasingly exploiting decentralized exchanges (DEXs), no-KYC swap services, and blockchain bridges to launder funds\u2026 <a href=\"https:\/\/t.co\/9LSfWGDPLd\" target=\"_blank\" rel=\"noopener noreferrer\">pic.twitter.com\/9LSfWGDPLd<\/a><\/p>\n<p>\u2014 Elliptic (@elliptic) <a href=\"https:\/\/twitter.com\/elliptic\/status\/1945771710172594630?ref_src=twsrc%5Etfw\" target=\"_blank\" rel=\"noopener noreferrer\">July 17, 2025<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>Les volumes suivent la tendance: plus il existe de blockchains interop\u00e9rables, plus la palette de masquage s\u2019\u00e9largit. Notamment, les flux que les enqu\u00eateurs attribuent \u00e0 la Cor\u00e9e du Nord repr\u00e9senteraient environ 12 % du total, mais ce r\u00e9flexe cross-chain devient d\u00e9sormais courant jusqu\u2019au niveau des <strong>arnaques de d\u00e9tail<\/strong>.<\/p>\n<h2><span id=\"dex_et_agregateurs_portes_dentree_discretes\">DEX et agr\u00e9gateurs, portes d\u2019entr\u00e9e discr\u00e8tes<\/span><\/h2>\n<p>La transparence on-chain des DEX ne les emp\u00eache pas de servir de sas de conversion. Sur des attaques r\u00e9centes, on observe souvent une premi\u00e8re \u00e9tape o\u00f9 les fraudeurs \u00e9changent des stablecoins vers une autre r\u00e9f\u00e9rence pour optimiser les co\u00fbts de bridge, avant une bascule vers Ethereum et une reconversion via agr\u00e9gateur en ETH. Le cas de mai 2025 sur <a href=\"https:\/\/coinmarketcap.com\/fr\/currencies\/sui\/\" target=\"_blank\" rel=\"noopener noreferrer\">Sui<\/a>, impliquant un important fournisseur de liquidit\u00e9, illustre ce sch\u00e9ma: les attaquants ont \u00e9chang\u00e9 du stablecoin, bridg\u00e9, puis rout\u00e9 via agr\u00e9gateur pour sortir sur un actif que l\u2019\u00e9metteur ne peut <strong>geler<\/strong>.<\/p>\n<p>L\u2019ouverture des agr\u00e9gateurs et des AMM permet en outre de cha\u00eener des paires exotiques, de fractionner les montants et d\u2019automatiser les s\u00e9quences, ce qui r\u00e9duit la visibilit\u00e9 des alarmes LBC. Certes, les DEX eux-m\u00eames ne fonctionnent pas cross-chain, mais les services modernes brouillent la fronti\u00e8re avec des <strong>swaps inter-actifs<\/strong> int\u00e9gr\u00e9s.<\/p>\n<h2><span id=\"coin_swap_services_le_bureau_de_change_de_lombre\">Coin swap services : le \u00ab bureau de change \u00bb de l\u2019ombre<\/span><\/h2>\n<p>\u00c0 c\u00f4t\u00e9 des bridges et DEX, des services d\u2019\u00e9change anonymes jouent le r\u00f4le de cambistes hors-radar. Pas d\u2019inscription, contr\u00f4les LBC quasi inexistants, promesse d\u2019accepter des fonds \u00ab sales \u00bb, publicit\u00e9 sur forums et canaux Telegram: ces plateformes servent de passerelles pour des r\u00e9seaux vari\u00e9s, des darknets aux escroqueries de type <strong>pig-butchering<\/strong>. Des annonces de fermeture ponctuelles n\u2019y changent pas grand-chose: une partie significative des flux \u00e0 risque y transite, avec un quart des mouvements li\u00e9s \u00e0 des sites de jeux en ligne non licenci\u00e9s.<\/p>\n<p>Certaines offres vont jusqu\u2019\u00e0 proposer des collectes d\u2019esp\u00e8ces, du comptage de billets ou des \u00ab tr\u00e9sors \u00bb enterr\u00e9s \u00e0 r\u00e9cup\u00e9rer contre crypto. D\u00e9sormais, la tendance se r\u00e9v\u00e8le suffisamment r\u00e9pandue pour que les enqu\u00eates impliquent, dans environ un tiers des cas, le suivi de trajectoires sur au moins <strong>trois r\u00e9seaux<\/strong>.<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">\ud83d\udce3 New Elliptic report: The state of cross-chain crime 2025 \ud83d\udd04<\/p>\n<p>Great news!  Our latest report, The state of cross-chain crime 2025, is now available.<\/p>\n<p>Cross-chain crime, the anonymous movement of illicit crypto through DEXs, cross-chain bridges and no-KYC swap services, has\u2026 <a href=\"https:\/\/t.co\/7jjIvE8NhB\" target=\"_blank\" rel=\"noopener noreferrer\">pic.twitter.com\/7jjIvE8NhB<\/a><\/p>\n<p>\u2014 Elliptic (@elliptic) <a href=\"https:\/\/twitter.com\/elliptic\/status\/1945469000973947236?ref_src=twsrc%5Etfw\" target=\"_blank\" rel=\"noopener noreferrer\">July 16, 2025<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<h2><span id=\"la_riposte_sorganise_entre_gel_de_stablecoins_et_analyses_multichaines\">La riposte s\u2019organise, entre gel de stablecoins et analyses multicha\u00eenes<\/span><\/h2>\n<p>Face \u00e0 ces nouvelles routes du blanchiment, les outils s\u2019adaptent progressivement. Des suites d\u2019investigation permettent d\u2019automatiser la reconstitution des parcours cross-chain et de visualiser les rebonds entre r\u00e9seaux et contrats. Du c\u00f4t\u00e9 des actifs, les \u00e9metteurs de stablecoins conservent la possibilit\u00e9 de geler des fonds identifi\u00e9s, ce qui pousse les acteurs malveillants \u00e0 convertir en actifs natifs moins contr\u00f4lables \u00e0 l\u2019issue des <strong>ponts<\/strong>.<\/p>\n<p>En r\u00e9alit\u00e9, la lutte reste asym\u00e9trique: les criminels misent sur la complexit\u00e9 et la vitesse, les analystes sur l\u2019automatisation et la coordination. Pour leur part, les autorit\u00e9s ciblent les maillons centralis\u00e9s ou juridiquement expos\u00e9s, qu\u2019il s\u2019agisse d\u2019exchanges frontaliers, de services de swap permissifs ou d\u2019interm\u00e9diaires op\u00e9rant dans des zones peu coop\u00e9ratives.<\/p>\n<p>Les bridges et swaps cross-chain deviennent la grande faille op\u00e9rationnelle de la crypto: des rails pens\u00e9s pour l\u2019interop\u00e9rabilit\u00e9, que d\u00e9tournent les fraudeurs en labyrinthes de blanchiment. Tant que l\u2019empilement de cha\u00eenes, d\u2019agr\u00e9gateurs et de services anonymes restera aussi accessible, le co\u00fbt d\u2019enqu\u00eate demeurera le terrain pr\u00e9f\u00e9r\u00e9 des <strong>fraudeurs<\/strong>. N\u00e9anmoins, la contre-offensive avance, entre gel cibl\u00e9, outillage forensics et coop\u00e9ration accrue.<\/p>\n<p>Elle devra faire jeu \u00e9gal avec la cr\u00e9ativit\u00e9 des attaquants, sous peine de voir la <strong>facture grimper<\/strong> encore.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le blanchiment crypto a chang\u00e9 d\u2019\u00e9chelle. Ce n\u2019est plus une affaire de mixers isol\u00e9s, mais de trajectoires \u00e9clat\u00e9es entre&#8230;<\/p>\n","protected":false},"author":224,"featured_media":9609,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-9605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cross-chain bridges : la faille b\u00e9ante de la crypto qui co\u00fbte des milliards<\/title>\n<meta name=\"description\" content=\"Les ponts cross-chain restent le maillon faible de la crypto. 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