{"id":51787,"date":"2026-08-23T13:47:02","date_gmt":"2026-08-23T13:47:02","guid":{"rendered":"https:\/\/volity.io\/blog\/crypto-taxes-exploits-risk-2\/"},"modified":"2026-08-24T16:15:32","modified_gmt":"2026-08-24T16:15:32","slug":"crypto-taxes-exploits-risk","status":"publish","type":"post","link":"https:\/\/volity.io\/fr\/actualites\/crypto-taxes-exploits-risk\/","title":{"rendered":"Marche crypto du jour : fiscalite, exploits et risques de flash crash"},"content":{"rendered":"<h2>Volity, le point crypto du matin : fiscalit\u00e9, exploits et test de r\u00e9sistance en flash crash<\/h2>\n\n<p>Le march\u00e9 crypto de ce dimanche pr\u00e9sente trois pressions famili\u00e8res sous une forme plus aigu\u00eb : la politique fiscale, la s\u00e9curit\u00e9 des protocoles et la capacit\u00e9 des plateformes.<\/p>\n\n<p>L&rsquo;Illinois teste un nouveau mod\u00e8le fiscal. Dans le m\u00eame temps, Term Labs fait face \u00e0 un exploit de gouvernance co\u00fbteux.<\/p>\n\n<p>En Cor\u00e9e du Sud, Upbit a trait\u00e9 pr\u00e8s de 830 millions de dollars en une heure de trading brutale.<\/p>\n\n<h3>L&rsquo;Illinois taxe la crypto, et le secteur riposte<\/h3>\n\n<p>L&rsquo;Illinois est devenu l&rsquo;un des premiers champs de bataille de la fiscalit\u00e9 crypto au niveau des \u00c9tats.<\/p>\n\n<p>Le Digital Asset Tax Act de l&rsquo;\u00c9tat impose un pr\u00e9l\u00e8vement de 0,2 % sur certaines transactions d&rsquo;actifs num\u00e9riques.<\/p>\n\n<p>La taxe s&rsquo;applique lorsque des courtiers \u00e9ligibles n\u00e9gocient ou d\u00e9tiennent des actifs pour des clients de l&rsquo;Illinois.<\/p>\n\n<p>Point essentiel : le pr\u00e9l\u00e8vement ne d\u00e9pend pas du fait que les clients aient gagn\u00e9 de l&rsquo;argent.<\/p>\n\n<p>Les courtiers dont les recettes li\u00e9es \u00e0 l&rsquo;Illinois d\u00e9passent $100 000 pourraient entrer dans son champ d&rsquo;application.<\/p>\n\n<p>Plusieurs groupements du secteur ont d\u00e9sormais contest\u00e9 la mesure devant les tribunaux.<\/p>\n\n<p>Ils soutiennent que l&rsquo;Illinois a r\u00e9serv\u00e9 aux actifs fond\u00e9s sur la blockchain un traitement qui ne s&rsquo;applique ni aux actions, ni aux obligations, ni aux liquidit\u00e9s.<\/p>\n\n<p>Les plaignants invoquent en outre la Dormant Commerce Clause, qui limite les charges impos\u00e9es par les \u00c9tats au commerce inter\u00e9tatique.<\/p>\n\n<p>Ils s&rsquo;appuient \u00e9galement sur la loi f\u00e9d\u00e9rale Internet Tax Freedom Act.<\/p>\n\n<p>Cette loi restreint les taxes discriminatoires sur l&rsquo;activit\u00e9 en ligne et le commerce \u00e9lectronique.<\/p>\n\n<p>Le litige compte au-del\u00e0 de l&rsquo;Illinois. Les \u00c9tats \u00e0 court de liquidit\u00e9s suivront l&rsquo;affaire de pr\u00e8s.<\/p>\n\n<p>Si l&rsquo;Illinois l&#8217;emporte, des taxes sur les transactions similaires pourraient se r\u00e9pandre dans tout le pays.<\/p>\n\n<p>Une d\u00e9faite limiterait en revanche la capacit\u00e9 des \u00c9tats \u00e0 isoler la crypto pour lui r\u00e9server un traitement fiscal particulier.<\/p>\n\n<p>Pour les plateformes d&rsquo;\u00e9change et les courtiers, le risque r\u00e9glementaire est devenu un co\u00fbt d&rsquo;exploitation mesurable.<\/p>\n\n<h3>Armstrong presse le Congr\u00e8s d&rsquo;adopter des r\u00e8gles plus claires<\/h3>\n\n<p>Brian Armstrong, directeur g\u00e9n\u00e9ral de Coinbase, continue de solliciter les s\u00e9nateurs au sujet du projet de loi CLARITY Act.<\/p>\n\n<p>Son argument est simple : les entreprises ont besoin de r\u00e8gles avant que les sanctions ne commencent.<\/p>\n\n<p>Armstrong estime que le cadre actuel laisse les entreprises et les clients particuliers dans l&rsquo;incertitude quant aux limites l\u00e9gales.<\/p>\n\n<p>Cette incertitude peut pousser l&rsquo;activit\u00e9 vers des places moins solides et des produits opaques.<\/p>\n\n<p>Le projet de loi cherche \u00e0 d\u00e9finir des cat\u00e9gories telles que \u00ab mati\u00e8res premi\u00e8res num\u00e9riques \u00bb et \u00ab jetons de r\u00e9seau \u00bb.<\/p>\n\n<p>Il r\u00e9partirait \u00e9galement les responsabilit\u00e9s entre la Securities and Exchange Commission et la Commodity Futures Trading Commission.<\/p>\n\n<p>La supervision d\u00e9pendrait des caract\u00e9ristiques de l&rsquo;actif et de la nature de chaque transaction.<\/p>\n\n<p>Le texte pr\u00e9voit en outre des obligations d&rsquo;enregistrement pour les plateformes d&rsquo;\u00e9change, les courtiers et les n\u00e9gociants traitant des mati\u00e8res premi\u00e8res num\u00e9riques.<\/p>\n\n<p>Cette structure ressemblerait aux r\u00e9gimes de licence d\u00e9j\u00e0 utilis\u00e9s sur les march\u00e9s financiers classiques.<\/p>\n\n<p>Les traders n&rsquo;appr\u00e9cieront peut-\u00eatre pas des r\u00e8gles plus strictes. Des r\u00e8gles pr\u00e9visibles peuvent pourtant r\u00e9duire les chocs r\u00e9glementaires soudains.<\/p>\n\n<p>Un cadre l\u00e9gal stabilis\u00e9 pourrait donc aider les institutions \u00e0 approuver des allocations plus importantes en actifs num\u00e9riques.<\/p>\n\n<p>Le compromis est clair. Les entreprises auraient moins de marge pour interpr\u00e9ter cr\u00e9ativement des r\u00e8gles floues.<\/p>\n\n<h3>Term Labs met \u00e0 nu le risque de gouvernance<\/h3>\n\n<p>Term Labs a confirm\u00e9 que des attaquants ont exploit\u00e9 les contr\u00f4les de gouvernance de certains de ses coffres de pr\u00eat.<\/p>\n\n<p>Les analystes en s\u00e9curit\u00e9 estiment les pertes \u00e0 pr\u00e8s de 8,5 millions de dollars, m\u00eame si le protocole \u00e9value encore le montant d\u00e9finitif.<\/p>\n\n<p>L&rsquo;attaquant aurait emport\u00e9 environ 2 843 ETH et 1,6 million de dollars en actifs index\u00e9s sur le dollar.<\/p>\n\n<p>Ces stablecoins ont transit\u00e9 par l&rsquo;USDC avant d&rsquo;atterrir en DAI, selon le suivi on-chain.<\/p>\n\n<p>L&rsquo;attaque ne semble pas avoir repos\u00e9 sur une erreur de codage classique.<\/p>\n\n<p>L&rsquo;attaquant a plut\u00f4t pris le contr\u00f4le effectif de la gouvernance des coffres et utilis\u00e9 des autorisations l\u00e9gitimes pour siphonner les fonds.<\/p>\n\n<p>Cette distinction compte. Les contrats de gouvernance constituent de plus en plus les cibles les plus juteuses de la finance d\u00e9centralis\u00e9e.<\/p>\n\n<p>Les failles directes des contrats intelligents attirent l&rsquo;examen. Les param\u00e8tres de gouvernance re\u00e7oivent souvent moins d&rsquo;attention.<\/p>\n\n<p>Des param\u00e8tres en apparence prudents peuvent en outre devenir dangereux lorsque la volatilit\u00e9 et la liquidit\u00e9 des pr\u00eats flash se percutent.<\/p>\n\n<p>Les coffres touch\u00e9s ne d\u00e9tenaient, semble-t-il, qu&rsquo;un peu plus que le montant d\u00e9rob\u00e9.<\/p>\n\n<p>L&rsquo;exploit a donc failli an\u00e9antir leur capacit\u00e9 de pr\u00eat d&rsquo;un seul coup.<\/p>\n\n<ul>\n  <li><b>Le contr\u00f4le compte :<\/b> les investisseurs doivent identifier qui peut modifier les r\u00e8gles de collat\u00e9ral, d&#8217;emprunt et de retrait.<\/li>\n  <li><b>Les d\u00e9lais comptent :<\/b> les timelocks et les pauses d&rsquo;urgence peuvent limiter les d\u00e9g\u00e2ts lorsque la gouvernance \u00e9choue.<\/li>\n  <li><b>La concentration compte :<\/b> un petit groupe de votants peut r\u00e9duire la d\u00e9centralisation \u00e0 une \u00e9tiquette fragile.<\/li>\n<\/ul>\n\n<p>Le rendement a toujours un prix. En DeFi, ce prix inclut les risques de code, de conservation, de liquidit\u00e9 et de gouvernance.<\/p>\n\n<h3>Upbit encaisse une heure \u00e0 un milliard de dollars<\/h3>\n\n<p>La Cor\u00e9e du Sud a fourni un autre test des infrastructures du march\u00e9 crypto.<\/p>\n\n<p>Upbit a trait\u00e9 environ 1 150 milliards de wons, soit pr\u00e8s de 830 millions de dollars, en une heure.<\/p>\n\n<p>Cette pouss\u00e9e est survenue pendant une forte baisse du march\u00e9 et a port\u00e9 le volume glissant sur 24 heures \u00e0 environ 3,8 milliards de dollars.<\/p>\n\n<p>Les traders se sont pr\u00e9cipit\u00e9s pour sortir de leurs positions. D&rsquo;autres en ont \u00e9t\u00e9 chass\u00e9s par des liquidations \u00e0 effet de levier.<\/p>\n\n<p>Le march\u00e9 crypto sud-cor\u00e9en, tr\u00e8s largement domin\u00e9 par les particuliers, amplifie souvent la dynamique des jetons tr\u00e8s d\u00e9tenus.<\/p>\n\n<p>L&rsquo;engouement r\u00e9cent pour XRP et les jetons li\u00e9s \u00e0 Trump a aliment\u00e9 cette tendance.<\/p>\n\n<p>Quand les prix chutent vite, le levier peut transformer un mouvement rapide en cha\u00eene de liquidations.<\/p>\n\n<p>La performance op\u00e9rationnelle d&rsquo;Upbit a n\u00e9anmoins de quoi rassurer.<\/p>\n\n<p>La plateforme a absorb\u00e9 un flux d&rsquo;ordres intense sans panne compl\u00e8te du syst\u00e8me ni interruption prolong\u00e9e.<\/p>\n\n<p>Cela marque un r\u00e9el progr\u00e8s par rapport aux tensions d&rsquo;infrastructure observ\u00e9es lors des pr\u00e9c\u00e9dents booms crypto.<\/p>\n\n<p>Les traders ne doivent toutefois pas confondre volume \u00e9lev\u00e9 et liquidit\u00e9 de sortie fiable.<\/p>\n\n<p>La liquidit\u00e9 appara\u00eet souvent quand les prix bougent d\u00e9j\u00e0 violemment, et les spreads peuvent s&rsquo;\u00e9largir sans pr\u00e9venir.<\/p>\n\n<h3>Ce que les traders doivent surveiller<\/h3>\n\n<ol>\n  <li><b>Suivez de pr\u00e8s l&rsquo;affaire de l&rsquo;Illinois.<\/b> Une taxe valid\u00e9e pourrait servir de mod\u00e8le \u00e0 d&rsquo;autres \u00c9tats.<\/li>\n  <li><b>Examinez la gouvernance avant de courir apr\u00e8s le rendement.<\/b> La TVL et l&rsquo;APY disent peu de chose des pouvoirs d&rsquo;urgence et de la concentration des votes.<\/li>\n  <li><b>Mettez \u00e0 l&rsquo;\u00e9preuve vos hypoth\u00e8ses sur les plateformes.<\/b> La r\u00e9silience d&rsquo;une place compte le plus lorsque les liquidations inondent le carnet d&rsquo;ordres.<\/li>\n  <li><b>Attendez-vous \u00e0 ce que la r\u00e9glementation fa\u00e7onne les valorisations.<\/b> Des r\u00e8gles f\u00e9d\u00e9rales claires pourraient favoriser les plateformes conformes et les \u00e9metteurs de jetons \u00e9tablis.<\/li>\n<\/ol>\n\n<p>Les march\u00e9s crypto gagnent en structure sur le plan juridique, dans la gouvernance et dans les syst\u00e8mes de trading.<\/p>\n\n<p>Chaque am\u00e9lioration r\u00e9v\u00e8le pourtant un autre point faible. Les traders doivent surveiller la cote et les petits caract\u00e8res en m\u00eame temps.<\/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\/crypto\/how-to-avoid-crypto-scams\/\">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 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