{"id":3152,"date":"2026-08-13T12:29:34","date_gmt":"2026-08-13T11:29:34","guid":{"rendered":"https:\/\/coinshares.citywire.com\/?p=3152"},"modified":"2026-08-13T12:30:02","modified_gmt":"2026-08-13T11:30:02","slug":"coldcard-la-question-de-la-conservation-que-tout-gerant-devrait-se-poser","status":"publish","type":"post","link":"https:\/\/coinshares.citywire.com\/fr\/coldcard-la-question-de-la-conservation-que-tout-gerant-devrait-se-poser\/","title":{"rendered":"Coldcard : la question de la conservation que tout g\u00e9rant devrait se poser"},"content":{"rendered":"\n

Le 30 juillet, un attaquant a commenc\u00e9 \u00e0 vider les adresses g\u00e9n\u00e9r\u00e9es par Coldcard, le hardware wallet exclusivement bitcoin con\u00e7u par la soci\u00e9t\u00e9 canadienne Coinkite. La premi\u00e8re salve a emport\u00e9 environ 594 BTC sur pr\u00e8s de 500 portefeuilles en quelque 25 minutes.1<\/sup> Au 4 ao\u00fbt, Galaxy Research estimait avec un haut degr\u00e9 de confiance que 1 596 BTC avaient \u00e9t\u00e9 d\u00e9rob\u00e9s sur environ 7 300 adresses, au fil de trois vagues confirm\u00e9es et de 14 incidents de moindre ampleur, pour plus de 100 millions de dollars. En int\u00e9grant une quatri\u00e8me vague suspect\u00e9e mais non confirm\u00e9e, le total pourrait approcher 2 055 BTC, soit environ 130 millions de dollars. Au moins 15 attaquants ind\u00e9pendants exploitaient la m\u00eame faille, et l’attaque \u00e9tait toujours en cours.2<\/sup><\/p>\n\n

En cause, ni lien d’hame\u00e7onnage ni appareil vol\u00e9. L’avis de s\u00e9curit\u00e9 de Coinkite remonte \u00e0 une modification du firmware datant de mars 2021 : la g\u00e9n\u00e9ration des cl\u00e9s y a \u00e9t\u00e9 confi\u00e9e \u00e0 un g\u00e9n\u00e9rateur de nombres al\u00e9atoires logiciel et pr\u00e9visible, au lieu du g\u00e9n\u00e9rateur mat\u00e9riel de la puce. L’\u00e9ventail des cl\u00e9s possibles s’en est trouv\u00e9 r\u00e9duit au point qu’un attaquant pouvait les reconstituer hors ligne, sans jamais toucher l’appareil. Seuls les portefeuilles \u00e0 signature unique sont concern\u00e9s. Coinkite a publi\u00e9 la liste des mod\u00e8les et des versions de firmware touch\u00e9s.3<\/sup><\/p>\n\n

Pourquoi ce cas est diff\u00e9rent<\/h2>\n\n

Le firmware corrig\u00e9 est sorti le 31 juillet, mais un correctif ne r\u00e9pare pas une cl\u00e9 d\u00e9j\u00e0 g\u00e9n\u00e9r\u00e9e. Les d\u00e9tenteurs doivent en g\u00e9n\u00e9rer une nouvelle et transf\u00e9rer leurs bitcoins. Seule une minorit\u00e9 de configurations \u00e9chappent au probl\u00e8me, celles construites avec une entropie priv\u00e9e ind\u00e9pendante suffisante.3<\/sup><\/p>\n\n

Le plus d\u00e9rangeant tient au profil des victimes. La faille a frapp\u00e9 des d\u00e9tenteurs qui avaient lu les arguments, achet\u00e9 un appareil r\u00e9put\u00e9, exclusivement d\u00e9di\u00e9 \u00e0 Bitcoin, et sorti leurs avoirs des exchanges. Le d\u00e9faut est rest\u00e9 invisible pendant plus de cinq ans, et aucun comportement du propri\u00e9taire ne pouvait le faire appara\u00eetre.<\/p>\n\n

La r\u00e9action du march\u00e9 a invers\u00e9 le sch\u00e9ma FTX. Fin 2022, les d\u00e9tenteurs retiraient leurs bitcoins des exchanges. Cette fois, ils les y ont renvoy\u00e9s. CryptoQuant a recens\u00e9 39 600 BTC d\u00e9plac\u00e9s par transferts inf\u00e9rieurs \u00e0 1 BTC le 31 juillet, tout juste sous les 39 900 BTC d\u00e9plac\u00e9s le 16 novembre 2022, quelques jours apr\u00e8s le d\u00e9p\u00f4t de bilan de FTX. Les entr\u00e9es nettes sur les exchanges ont atteint 11 163 BTC.4<\/sup><\/p>\n\n

La conservation est un curseur de risque, pas une profession de foi<\/h2>\n\n

D\u00e9tenir ses propres cl\u00e9s ou d\u00e9tenir un produit cot\u00e9 ? La question ressurgit \u00e0 chaque incident, et ceux qui ont b\u00e2ti cette industrie refusent de trancher.<\/p>\n\n

Nous avions pos\u00e9 la question \u00e0 Adam Back l’an dernier. Le cryptographe, aujourd’hui directeur g\u00e9n\u00e9ral de Blockstream, fait partie de la poign\u00e9e de chercheurs dont les travaux sont cit\u00e9s dans le livre blanc de Bitcoin. Sa r\u00e9ponse : \u00ab Les deux. J’ai d’ailleurs pratiqu\u00e9 les deux. Les ETF offrent des avantages en mati\u00e8re d’int\u00e9gration au portefeuille et d’emprunt… Mais l’auto-conservation est essentielle pour pr\u00e9server la d\u00e9centralisation et l’immuabilit\u00e9. \u00bb Il avait d\u00e9j\u00e0 mis en garde : \u00ab l’auto-conservation n’est pas faite pour tout le monde \u00bb.5<\/sup><\/p>\n\n

David Marcus a pr\u00e9sid\u00e9 PayPal, dirig\u00e9 le projet de monnaie num\u00e9rique de Meta, puis pris la t\u00eate de Lightspark. Il plaide ouvertement pour l’auto-conservation, tout en gardant une r\u00e9serve : \u00ab Personnellement, je pense que la meilleure fa\u00e7on de faire, c’est de combiner des services de conservation assur\u00e9s par des acteurs de confiance et l’auto-conservation. \u00bb6<\/sup><\/p>\n\n

Eric Balchunas, de Bloomberg, met en avant un obstacle plus prosa\u00efque : \u00ab Les portefeuilles restent aujourd’hui trop complexes. Quand ce sera plus simple, je passerai peut-\u00eatre \u00e0 l’auto-conservation. Pour l’instant, les ETF suppriment cette friction. \u00bb7<\/sup><\/p>\n\n

Ce que l\u2019ETP r\u00e8gle, et ne r\u00e8gle pas<\/h2>\n\n

Un ETP ne supprime pas le risque li\u00e9 aux cl\u00e9s. Il le d\u00e9place vers un conservateur qui applique une g\u00e9n\u00e9ration de cl\u00e9s de niveau institutionnel, des contr\u00f4les multisignatures, des audits et une assurance. Il remplace ainsi un point de d\u00e9faillance unique et silencieux par une contrepartie qui en r\u00e9pond. En \u00e9change, le d\u00e9tenteur accepte le risque \u00e9metteur et le risque de conservation, des frais de gestion et l’impossibilit\u00e9 d’effectuer des transactions on-chain. C’est un arbitrage, pas une am\u00e9lioration.<\/p>\n\n

Un d\u00e9faut de firmware ne cl\u00f4t pas non plus le d\u00e9bat. Peter Todd, d\u00e9veloppeur Bitcoin de la premi\u00e8re heure, a formul\u00e9 l’argument inverse sans d\u00e9tour : \u00ab L’auto-conservation affiche un bien meilleur bilan de s\u00e9curit\u00e9 que celui des tiers. \u00bb Il rappelait que le seul dossier QuadrigaCX avait co\u00fbt\u00e9 environ 200 millions de dollars aux utilisateurs. C’\u00e9tait \u00e0 peu pr\u00e8s le double des pertes Coldcard connues au moment o\u00f9 il \u00e9crivait.8<\/sup> Willy Woo, qui dit n’avoir rien contre les produits r\u00e9glement\u00e9s, soutient que seule l’auto-conservation conf\u00e8re une propri\u00e9t\u00e9 v\u00e9ritablement souveraine.9<\/sup><\/p>\n\n

Les deux lectures se d\u00e9fendent. Pour un g\u00e9rant allocataire, la question se pose en des termes plus \u00e9troits : quel mode de d\u00e9faillance un client peut-il d\u00e9tecter, assurer et surmonter ? Pendant cinq ans, les d\u00e9tenteurs de Coldcard n’ont pu faire aucune de ces trois choses.<\/p>\n\n

Sources<\/strong><\/p>\n\n

1<\/sup> Crypto Economy, \u00ab Coldcard Vulnerability Turns ‘Impossible to Guess’ Seeds Into Guessable Ones, Draining 594 BTC \u00bb, 31 juillet 2026<\/p>\n\n

2<\/sup> Galaxy Research, via The Block, \u00ab Bitcoin losses from Coldcard hack could swell to $130 million \u00bb, 4 ao\u00fbt 2026<\/p>\n\n

3<\/sup> Coinkite, \u00ab Coldcard Security Advisory \u00bb, 30 juillet 2026, mis \u00e0 jour le 1er ao\u00fbt 2026<\/p>\n\n

4<\/sup> CryptoQuant et Timechainindex, via CoinDesk, 2 ao\u00fbt 2026<\/p>\n\n

5<\/sup> Entretien CoinShares, Adam Back, directeur g\u00e9n\u00e9ral de Blockstream, 23 mai 2025<\/p>\n\n

6<\/sup> Entretien CoinShares, David Marcus, directeur g\u00e9n\u00e9ral et fondateur de Lightspark, 13 novembre 2025<\/p>\n\n

7<\/sup> Entretien CoinShares, Eric Balchunas, analyste ETF senior, Bloomberg, 11 juillet 2025<\/p>\n\n

8<\/sup> Peter Todd, publication sur X, 3 ao\u00fbt 2026<\/p>\n\n

9<\/sup> Willy Woo, publication sur X, via The Crypto Times, 3 ao\u00fbt 2026<\/p>\n\n

* CoinShares est \u00e9metteur d’ETP adoss\u00e9s aux cryptomonnaies. Les montants de pertes sont des estimations publi\u00e9es par Galaxy Research, arr\u00eat\u00e9es au 4 ao\u00fbt 2026. L’exploitation de la faille \u00e9tait toujours en cours au moment de la r\u00e9daction et les totaux ont \u00e9t\u00e9 r\u00e9vis\u00e9s \u00e0 la hausse \u00e0 plusieurs reprises.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Une faille de firmware vieille de cinq ans a co\u00fbt\u00e9 plus de 100 millions de dollars aux d\u00e9tenteurs de bitcoin. La le\u00e7on porte sur le risque op\u00e9rationnel, pas l’id\u00e9ologie.<\/p>\n","protected":false},"author":2,"featured_media":3151,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","iawp_total_views":37,"footnotes":""},"categories":[80],"tags":[],"class_list":["post-3152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-connaissance-client"],"yoast_head":"\nColdcard : la question de la conservation que tout g\u00e9rant devrait se poser - Citywire | CoinShares<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/coinshares.citywire.com\/fr\/coldcard-la-question-de-la-conservation-que-tout-gerant-devrait-se-poser\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Coldcard : la question de la conservation que tout g\u00e9rant devrait se poser - Citywire | CoinShares\" \/>\n<meta property=\"og:description\" content=\"Une faille de firmware vieille de cinq ans a co\u00fbt\u00e9 plus de 100 millions de dollars aux d\u00e9tenteurs de bitcoin. 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