{"id":65436,"date":"2021-11-28T14:31:00","date_gmt":"2021-11-28T14:31:00","guid":{"rendered":"https:\/\/fr.cryptonews.com\/?p=65436"},"modified":"2023-06-26T11:06:51","modified_gmt":"2023-06-26T11:06:51","slug":"algorithme-de-minage-du-bitcoin-comprendre-les-bases-du-sha-256-part-2","status":"publish","type":"post","link":"https:\/\/cryptonews.com\/fr\/exclusives\/algorithme-de-minage-du-bitcoin-comprendre-les-bases-du-sha-256-part-2\/","title":{"rendered":"Algorithme de minage du Bitcoin\u00a0: Comprendre les bases du SHA-256 (2\u00e8me Partie)"},"content":{"rendered":"<p>Dans le pr&eacute;c&eacute;dent article, nous avons &eacute;voqu&eacute; la <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/cryptonews.com\/fr\/exclusives\/algorithme-de-minage-du-bitcoin-comprendre-les-bases-du-sha-256\/\"><u>notion de hashage<\/u><\/a>. Dans ce nouveau volet, d&eacute;couvrez la place du hash dans le minage de Bitcoin. Autrement dit, quel est le lien entre le hash et le process global de minage&nbsp;?<\/p><figure class=\"image\"><img decoding=\"async\" src=\"https:\/\/cimg.co\/news\/65436\/42632\/adobestock-184656954-2-1-1.jpeg\" alt=\"\" srcset=\"https:\/\/cimg.co\/news\/65436\/42632\/responsive-images\/adobestock-184656954-2-1-1___media_library_original_1000_663.jpeg 1000w, https:\/\/cimg.co\/news\/65436\/42632\/responsive-images\/adobestock-184656954-2-1-1___media_library_original_900_596.jpeg 900w, https:\/\/cimg.co\/news\/65436\/42632\/responsive-images\/adobestock-184656954-2-1-1___media_library_original_720_477.jpeg 720w, https:\/\/cimg.co\/news\/65436\/42632\/responsive-images\/adobestock-184656954-2-1-1___media_library_original_600_397.jpeg 600w, https:\/\/cimg.co\/news\/65436\/42632\/responsive-images\/adobestock-184656954-2-1-1___media_library_original_300_198.jpeg 300w\" sizes=\"100vw\" width=\"1000\" class=\"content-img\"><figcaption>Source : Adobe \/ mehaniq41<\/figcaption><\/figure><h2>&#8203;L&rsquo;algorithme SHA-256 et le minage<\/h2><span class=\"replacer\"><\/span><p>A ce stade, vous avez compris l&rsquo;int&eacute;r&ecirc;t de la fonction math&eacute;matique de hashage. Mais que vient faire le calcul du hash dans toute la s&eacute;quence du minage de Bitcoin&nbsp;?<\/p><h3>&#8203;La notion de bloc<\/h3><p>Le minage consiste &agrave; valider un bloc de plusieurs transactions pour l&rsquo;int&eacute;grer &agrave; la blockchain. La taille d&rsquo;un bloc est fixe. Sur le Bitcoin, la <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.blockchain.com\/charts\/avg-block-size\"><u>taille des blocs oscille entre 0,8 et 1,4 MB<\/u><\/a> grosso modo. Concr&egrave;tement, un bloc contient les informations suivantes&nbsp;:<\/p><ul><li>Partie 1&nbsp;: Le hash du bloc pr&eacute;c&eacute;dent&nbsp;;<\/li><li>Partie 2&nbsp;: Les informations li&eacute;es aux transactions&nbsp;;<\/li><li>Partie 3&nbsp;: La signature&nbsp;;<\/li><li>Partie 4&nbsp;: La &laquo;&nbsp;preuve de travail&nbsp;&raquo; ou Nonce (voir ci-dessous)&nbsp;;<\/li><li>Partie 5&nbsp;: Le hash du bloc une fois valid&eacute;.<\/li><\/ul><h3>&#8203;Le hashage d&rsquo;un bloc<\/h3><p>Comme mentionn&eacute; ci-dessus, le minage permet de cr&eacute;er un bloc sur la blockchain. Pour des raisons de s&eacute;curit&eacute; &eacute;videntes, tout bloc cr&eacute;&eacute; doit r&eacute;pondre &agrave; des conditions. Sur le Bitcoin et &agrave; l&rsquo;heure actuelle, la condition est que <strong>le hash du nouveau bloc (partie 5) doit commencer par 19 z&eacute;ros<\/strong>.<\/p><p>Pour le confirmer, prenons l&rsquo;exemple d&rsquo;un bloc r&eacute;cemment min&eacute; sur le r&eacute;seau Bitcoin. Le <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.blockchain.com\/btc\/block\/00000000000000000006d6cc3d53cd64c1684bd6780f97cf75670813ebb76e54\"><u>bloc 711244<\/u><\/a> a &eacute;t&eacute; min&eacute; le 25 novembre &agrave; 9h45 (GMT+1). Comme vous pouvez le constater, son hash commence bien par 19 z&eacute;ros&nbsp;:<\/p><p>00000000000000000006d6cc3d53cd64c1684bd6780f97cf75670813ebb76e54<\/p><p>Autrement dit, <strong>le premier mineur qui trouve un hash qui d&eacute;bute avec 19 z&eacute;ros valide le bloc<\/strong>. Or, comme expliqu&eacute; dans le pr&eacute;c&eacute;dent article, la fonction math&eacute;matique de hash est si complexe qu&rsquo;il est impossible de pr&eacute;voir le r&eacute;sultat. Cela vous permet de comprendre la notion de &laquo;&nbsp;difficult&eacute;&nbsp;&raquo; dans le minage et donc de concurrence entre les pools de mineurs.<\/p><p>Pour obtenir le bon hash, le mineur ne peut faire varier que la &laquo;&nbsp;preuve de travail&nbsp;&raquo; ou Proof-Of-Work (POW). Dans les faits, il s&rsquo;agit d&rsquo;<strong>un nombre unique de 32 bits appel&eacute; commun&eacute;ment &laquo;&nbsp;Nonce&nbsp;&raquo;<\/strong>. En gros, le mineur essaie diff&eacute;rents nombres et effectue de nombreuses it&eacute;rations jusqu&rsquo;&agrave; trouver celui qui renvoie un hash satisfaisant.&nbsp;<\/p><figure class=\"image\"><img decoding=\"async\" src=\"https:\/\/cimg.co\/p\/no_image.svg\" alt=\"\" sizes=\"100vw\" width=\"1200\" class=\"content-img lazyload\" data-src=\"https:\/\/cimg.co\/news\/65436\/42612\/adobestock-308882163.jpeg\" data-srcset=\"https:\/\/cimg.co\/news\/65436\/42612\/responsive-images\/adobestock-308882163___media_library_original_1200_952.jpeg 1200w, https:\/\/cimg.co\/news\/65436\/42612\/responsive-images\/adobestock-308882163___media_library_original_900_714.jpeg 900w, https:\/\/cimg.co\/news\/65436\/42612\/responsive-images\/adobestock-308882163___media_library_original_720_571.jpeg 720w, https:\/\/cimg.co\/news\/65436\/42612\/responsive-images\/adobestock-308882163___media_library_original_600_476.jpeg 600w, https:\/\/cimg.co\/news\/65436\/42612\/responsive-images\/adobestock-308882163___media_library_original_300_238.jpeg 300w\"><figcaption>Source : Adobe \/ shane<\/figcaption><\/figure><h2>&#8203;Le hashrate, un indicateur important &agrave; conna&icirc;tre<\/h2><span class=\"replacer\"><\/span><p>Il est courant de parler du hashrate dans la litt&eacute;rature crypto. D&eacute;couvrez ci-dessous ce dont il s&rsquo;agit.<\/p><h3>&#8203;Qu&rsquo;est-ce que le hashrate&nbsp;?<\/h3><p>Une fois la notion de hash comprise, il est facile d&rsquo;appr&eacute;hender le hashrate. Le hashrate est un indicateur qui <strong>permet d&rsquo;appr&eacute;hender l&rsquo;activit&eacute; sur le r&eacute;seau Bitcoin<\/strong>.<\/p><p>En fait, pour &ecirc;tre pr&eacute;cis, le hashrate est une <strong>unit&eacute; de vitesse<\/strong> comme le km\/h par exemple. Le hashrate s&rsquo;exprime en &laquo;&nbsp;H\/s&nbsp;&raquo;, c&rsquo;est-&agrave;-dire un <strong>nombre de hash par seconde<\/strong>. Le hashrate caract&eacute;rise donc la capacit&eacute; d&rsquo;un r&eacute;seau &agrave; calculer un certain nombre de hash par seconde.<\/p><p>Les moyens informatiques en jeu sur le Bitcoin permettent de calculer un grand nombre de hash par seconde. Aussi, il est plus commode d&rsquo;exprimer des multiples de hashrate comme&nbsp;:<\/p><ul><li>Kilo (1 000) : KH\/s ;<\/li><li>Mega (un million) : MH\/s ;<\/li><li>Giga (un milliard)&nbsp;: GH\/s ;<\/li><li>Tera (trillion) : TH\/s ;<\/li><li>Peta (quadrillion) : PH\/s ;<\/li><li>Exa (quintillion) : EH\/s ;<\/li><li>Zeta (sextillion) : ZH\/s.<\/li><\/ul><p>Le hashrate est une donn&eacute;e importante lorsqu&rsquo;il s&rsquo;agit d&rsquo;acheter du mat&eacute;riel de minage. En effet, comme expliqu&eacute; dans le pr&eacute;c&eacute;dent article, les mineurs sont en concurrence lorsqu&rsquo;il s&rsquo;agit de trouver la bonne &laquo;&nbsp;Preuve de travail&nbsp;&raquo;. Autrement dit, pour avoir ses chances, un mineur doit disposer d&rsquo;un <strong>mat&eacute;riel capable de calculer un tr&egrave;s grande nombre de hash<\/strong>. De cette fa&ccedil;on, il peut essayer beaucoup de preuves de travail.&nbsp;<\/p><p>Dans les faits, sur le Bitcoin, la plupart des mineurs sont regroup&eacute;s en &laquo;&nbsp;pool&nbsp;&raquo;. Cela leur permet de <strong>mettre en commun leur puissance de calcul<\/strong> et ainsi d&rsquo;augmenter leur&hellip; hashrate&nbsp;!<\/p><figure class=\"image\"><img decoding=\"async\" src=\"https:\/\/cimg.co\/p\/no_image.svg\" alt=\"\" sizes=\"100vw\" width=\"1200\" class=\"content-img lazyload\" data-src=\"https:\/\/cimg.co\/news\/65436\/42603\/adobestock-167765287.jpeg\" data-srcset=\"https:\/\/cimg.co\/news\/65436\/42603\/responsive-images\/adobestock-167765287___media_library_original_1200_400.jpeg 1200w, https:\/\/cimg.co\/news\/65436\/42603\/responsive-images\/adobestock-167765287___media_library_original_900_300.jpeg 900w, https:\/\/cimg.co\/news\/65436\/42603\/responsive-images\/adobestock-167765287___media_library_original_720_240.jpeg 720w, https:\/\/cimg.co\/news\/65436\/42603\/responsive-images\/adobestock-167765287___media_library_original_600_200.jpeg 600w, https:\/\/cimg.co\/news\/65436\/42603\/responsive-images\/adobestock-167765287___media_library_original_300_100.jpeg 300w\"><figcaption>Source : Adobe \/ slavun<\/figcaption><\/figure><h3>&#8203;&#8203;Le hahsrate du Bitcoin &agrave; l&rsquo;heure actuelle<\/h3><p>Le hashrate total (H) du Bitcoin se calcule &agrave; l&rsquo;aide de la formule math&eacute;matique suivante&nbsp;:<\/p><p><strong>H= 2^32 * (D\/T)<\/strong><\/p><p>Dans cette formule, T exprime la dur&eacute;e moyenne de minage d&rsquo;un bloc et D la difficult&eacute;. En effet, afin de maintenir un temps de r&eacute;solution raisonnable (autour de 10 minutes), le r&eacute;seau adapte r&eacute;guli&egrave;rement le niveau de &laquo;&nbsp;difficult&eacute;&nbsp;&raquo; de minage.<\/p><p>Le hashrate du r&eacute;seau Bitcoin a augment&eacute; consid&eacute;rablement avec les ann&eacute;es. Cela traduit une augmentation des activit&eacute;s de minage (et donc d&rsquo;utilisation du Bitcoin) mais &eacute;galement une inflation dans la capacit&eacute; des moyens mis en &oelig;uvre.<\/p><p>Ainsi, en janvier 2016, le hashrate du BTC &eacute;tait inf&eacute;rieur &agrave; 1 000 000 TH\/s. A l&rsquo;heure actuelle,<strong> le hashrate du Bitcoin est sup&eacute;rieur &agrave; 150 000 000 TH\/s<\/strong>, soit&hellip; 150 fois plus&nbsp;!&nbsp;<\/p><p>A titre de comparaison, le <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.coinwarz.com\/mining\/dogecoin\/hashrate-chart\"><u>hashrate du Dogecoin<\/u><\/a> (autre crypto POW qui fait partie du top 10 mondial) est &agrave; l&rsquo;heure actuelle de &laquo;&nbsp;seulement&nbsp;&raquo; 277 TH\/s. Autre exemple, le <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/bitinfocharts.com\/comparison\/litecoin-hashrate.html#3y\"><u>hashrate du Litecoin (LTC)<\/u><\/a>, issu du protocole Bitcoin et 15&egrave;me crypto mondiale, tourne autour de 300 TH\/s &agrave; l&rsquo;heure actuelle.&nbsp;<\/p><p>_______________________<\/p><p>Suivez nos liens d&#8217;affili&eacute;s:<\/p><p><strong>Pour acheter des cryptomonnaies en Zone SEPA, Europe et citoyens fran&ccedil;ais<\/strong>, visitez <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.coinhouse.com\/r\/179207\">Coinhouse<\/a>&nbsp;<\/p><p><strong>Pour acheter des cryptomonnaies au Canada<\/strong>, visitez <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/go.bitbuy.tech\/aff_c?offer_id=3&amp;aff_id=1009&amp;source=FR\">Bitbuy<\/a><\/p><p><strong>Pour g&eacute;n&eacute;rer des int&eacute;r&ecirc;ts gr&acirc;ce &agrave; vos bitcoins<\/strong>, allez sur le site de <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/blockfi.mxuy67.net\/kqG6x\">BlockFi<\/a><\/p><p><strong>Pour s&eacute;curiser ou stocker vos cryptomonnaies<\/strong>, procurez-vous les portefeuilles <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/shop.ledger.com\/?r=12b53b98a1c0&amp;tracker=CN-FR\">Ledger<\/a> ou <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/shop.trezor.io\/?offer_id=82&amp;aff_id=1814\">Trezor<\/a><\/p><p><strong>Pour transiger vos cryptos de fa&ccedil;on anonyme<\/strong>, installez l&#8217;application <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/go.nordvpn.net\/aff_c?offer_id=252&amp;aff_id=54152&amp;url_id=14818\">NordVPN<\/a><\/p><p><strong>Pour investir dans le minage ou les masternodes :<\/strong><\/p><ul><li>Sur <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/feel-mining.com\/?tracking=1ED831AFAB\">Feel Mining<\/a><\/li><li>Sur <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.just-mining.com\/register?sponsor=aNJ7nRa0m3qvgi6LkMXAZX506\">Just Mining<\/a><\/li><\/ul><p><strong>Pour accumuler des cryptos en jouant :<\/strong><\/p><ul><li>Au poker sur la plateforme de jeux <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/coinpoker.com\/crypto\">CoinPoker<\/a><\/li><li>&Agrave; un fantasy football mondial sur la plateforme <a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/sorare.pxf.io\/c\/2102999\/902742\/12209\">Sorare<\/a><\/li><\/ul><p>________________<\/p><p>Voici les sources d&rsquo;informations qu&rsquo;on vous propose:<\/p><p><strong>Notre newsletter hebdomadaire gratuite: <\/strong><a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.getrevue.co\/profile\/CryptonewsFR\"><strong>https:\/\/www.getrevue.co\/profile\/CryptonewsFR<\/strong><\/a><\/p><p><strong>Twitter: <\/strong><a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/twitter.com\/cryptonews_FR\"><strong>https:\/\/twitter.com\/cryptonews_FR<\/strong><\/a><\/p><p><strong>Telegram: <\/strong><a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/t.me\/cryptonews_FR\"><strong>https:\/\/t.me\/cryptonews_FR<\/strong><\/a><\/p><p><strong>LinkedIn: <\/strong><a target=\"_blank\" rel=\"noopener \" href=\"https:\/\/www.linkedin.com\/company\/11745115\"><strong>https:\/\/www.linkedin.com\/company\/11745115<\/strong><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Dans le pr&eacute;c&eacute;dent article, nous avons &eacute;voqu&eacute; la notion de hashage. Dans ce nouveau volet, d&eacute;couvrez la place du hash dans le minage de Bitcoin. Autrement dit, quel est le lien entre le hash et le process global de minage&nbsp;?Source : Adobe \/ mehaniq41&#8203;L&rsquo;algorithme SHA-256 et le minageA ce stade, vous avez compris l&rsquo;int&eacute;r&ecirc;t de [&hellip;]<\/p>\n","protected":false},"author":34,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5,2],"tags":[62],"editors":[1555],"sponsored_companies":[],"class_list":["post-65436","post","type-post","status-publish","format-standard","hentry","category-features","category-exclusives","tag-minage","editors-kevin-comitogianni"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Minage du Bitcoin\u00a0: Comprendre les bases du SHA-256 (2\/2)<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez la suite de notre article pour comprendre le 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