{"id":1973,"date":"2014-12-13T10:44:10","date_gmt":"2014-12-13T10:44:10","guid":{"rendered":"http:\/\/bitcoinromania.ro\/?p=1973"},"modified":"2026-03-01T13:46:36","modified_gmt":"2026-03-01T11:46:36","slug":"unde-este-bitcoin-vulnerabil","status":"publish","type":"post","link":"https:\/\/bitcoinromania.ro\/blog\/unde-este-bitcoin-vulnerabil\/","title":{"rendered":"Unde este Bitcoin vulnerabil"},"content":{"rendered":"<p>Un avantaj pe care Bitcoin \u00een are \u00een fa\u021ba cardurilor de credit este faptul c\u0103 toate tranzac\u021biile sunt ireversibile odat\u0103 ce au fost validate \u0219i ad\u0103ugate lan\u021bului de blocuri. Acest lucru protejeaz\u0103 comercian\u021bii de la fraude \u2013 o problem\u0103 foarte comun\u0103 \u00een cazul pl\u0103\u021bilor cu cardurile de credit. Deoarece protocolul Bitcoin instruie\u0219te minerii s\u0103 lucreze \u00een lan\u021bul cu cea mai mare dificultate, bifurca\u021biile sunt rezolvate relativ rapid. \u00cen martie 2013, cu toate acestea, o bifurca\u021bie dificil\u0103 a avut loc \u00een lan\u021bul de blocuri care nu putea fi rezolvat\u0103 doar cu ajutorul protocolului.<\/p>\n<p>Lan\u021bul de blocuri este un registru public ce con\u021bine o istorie complet\u0103 a tuturor tranzac\u021biilor valide. O bifurca\u021bie dificil\u0103 creaz\u0103 dou\u0103 istoricuri separate de tranzac\u021bii dup\u0103 un eveniment de bifurca\u021bie. \u00cen acest caz, bifurca\u021bia dificil\u0103 ce are loc \u00een versiunea clientului 0.7 reprezint\u0103 un bug. Minerii ce au folosit versiunea 0.8 au generat un bloc de tranzac\u021bie mult mai mare (#225430) care a fost valid din punct de vedere tehnic \u00eens\u0103 respins de versiunea 0.7.<\/p>\n<p>Aceast\u0103 bifurca\u021bie nu putea s\u0103 fie rezolvat\u0103 automat deoarece lan\u021bul incompatibil 0.7 avea putere peste 60% din puterea computerizat\u0103 a re\u021belei. Din cauza acestei bifurca\u021bii, minerii au \u00eenceput s\u0103 foloseasc\u0103 0.8, lucr\u00e2nd cu o versiune a lan\u021bului de bloc ce includea #225430, \u00een timp ce minerii ce foloseau 0.7 au v\u0103zut o versiune diferit\u0103 a istoricului tranzac\u021biilor. Urm\u00e2nd o direc\u021bie a timpului a acestei bifurca\u021bii dificile, comunitatea online de dezvoltatori a c\u0103zut de acord \u00een mod rapid s\u0103 treac\u0103 la versiunea 0.7. Fiecare operator al unui bazin minier major a intrat pe canalul IRC Bitcoin-dev \u0219i s-a putut observa cum mari exchange-uri au fost suspendate temporar. Aceast\u0103 lovitur\u0103 economic\u0103 nu a fost foarte semnificant\u0103, \u00eens\u0103 a con\u021binut urm\u0103toarele: operatorii BTCGuild \u0219i Slush au pierdut Bitcoin \u00een valoare de 26.000 de dolari, iar comerciantul OKPay a pierdut 10.000 de dolari din cauza unei duble cheltuieli.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/blackspike.com\/site\/wp-content\/uploads\/2014\/03\/bitcoinLogoWallpaper.png\" alt=\"\" width=\"614\" height=\"263\" \/><\/p>\n<p>Cu toate c\u0103 aceast\u0103 bifurca\u021bie dificil\u0103 a fost rezolvat\u0103 \u00een numai 6 ore, acest lucru scoate \u00een lumin\u0103 c\u00e2teva dintre problemele tehnice pe care protocolul Bitcoin le \u00eent\u00e2mpin\u0103. La \u00eenceput, este interesant faptul c\u0103 aceast\u0103 problem\u0103 tehnic\u0103 a fost solu\u021bionat\u0103 cu o interven\u021bie social\u0103. Deoarece re\u021beaua este \u00eentrutotul descentralizat\u0103, niciun element guvernamental nu putea intra pentru a solu\u021biona problema. Motivul pentru care s-a decis revenirea la 0.7 a fost posibil\u0103 pentru c\u0103 peste 70% din puterea computerizat\u0103 a re\u021belei Bitcoin era controlat\u0103 de un grup mic de mineri \u0219i astfel to\u021bi minerii din re\u021bea putea fi contacta\u021bi individual pentru a li se spune ce se \u00eent\u00e2mpl\u0103. \u00cen concordan\u021b\u0103, putem observa puterea bazinelor miniere \u00een ecosistemul Bitcoin de ast\u0103zi, peste 70% din Bitcoini fiind mina\u021bi de aceste bazine miniere.<\/p>\n<p>\u00cen al doilea r\u00e2nd, \u00een ciuda faptului c\u0103 Bitcoin este teoretic imun la dubla cheltuire, acesta poate de fapt s\u0103 aib\u0103 parte de o bifurca\u021bie dificil\u0103. Din p\u0103cate, dubla cheltuire din acest caz nu a fost f\u0103cut\u0103 cu inten\u021bie, utilizatorul pur \u0219i simplu a vrut s\u0103 vad\u0103 dac\u0103 poate s\u0103 fie f\u0103cut\u0103. \u00cen al treilea r\u00e2nd, integritatea sistemului Bitcoin depinde de o presupunere critic\u0103 pe care niciun adversar nu o poate ob\u021bine, o putere computerizat\u0103 at\u00e2t de mare care s\u0103 poat\u0103 fac\u0103 public\u0103 o tranzac\u021bie fals\u0103 \u0219i care s\u0103 fie \u0219i acceptat\u0103. \u00cens\u0103, aceasta ar putea reprezenta o amenin\u021bare pentru viitor pentru to\u021bi cei care sunt conecta\u021bi la re\u021beaua Bitcoin.<\/p>\n<p>Nakamoto a conceput protocolul Bitcoin consider\u00e2nd c\u0103 marea majoritate a utilizatorilor poate preveni orice num\u0103r mic de incidente ostile care s\u0103 acapareze re\u021beaua. \u00cens\u0103 ce se \u00eent\u00e2mpl\u0103 dac\u0103 aceste lucruri persist\u0103? Din p\u0103cate, aceast\u0103 fric\u0103 a mic\u0219orat realitatea \u00een care minerii individuali pot trece de la un bazin minier la altul aproape instant. Astfel, dac\u0103 orice operator are inten\u021bii ostile \u0219i controleaz\u0103 o bun\u0103 parte din puterea computerizat\u0103, atunci minerii ar putea imediat s\u0103 p\u0103r\u0103seasc\u0103 bazinul minier \u0219i s\u0103 echilibreze situa\u021bia.<\/p>\n<p>\u00cen adi\u021bie, putem spune c\u0103 bifurca\u021biile dificile, problemele de securitate \u0219i alte incidente tehnice pot sc\u0103dea adoptarea, reabilitatea \u0219i securitatea monedei, toate acestea fiind necesare pentru a p\u0103stra \u00eencrederea utilizatorilor \u00een platforma \u0219i moneda Bitcoin. \u00cens\u0103 compar\u00e2nd cu ce se \u00eent\u00e2mpla acum c\u00e2\u021biva ani, putem spune c\u0103 Bitcoin a evoluat \u00eendeajuns de mult \u00eenc\u00e2t oricine poate adopta Bitcoin.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un avantaj pe care Bitcoin \u00een are \u00een fa\u021ba cardurilor de credit este faptul c\u0103 toate tranzac\u021biile sunt ireversibile odat\u0103 ce au fost validate \u0219i ad\u0103ugate lan\u021bului de blocuri. Acest lucru protejeaz\u0103 comercian\u021bii de la fraude \u2013 o problem\u0103 foarte comun\u0103 \u00een cazul pl\u0103\u021bilor cu cardurile de credit. Deoarece protocolul Bitcoin instruie\u0219te minerii s\u0103 lucreze \u00een lan\u021bul cu cea mai mare dificultate, bifurca\u021biile sunt rezolvate relativ rapid. \u00cen martie 2013, cu toate acestea, o bifurca\u021bie dificil\u0103 a avut loc \u00een<a class=\"more-link\" href=\"https:\/\/bitcoinromania.ro\/blog\/unde-este-bitcoin-vulnerabil\/\"><span>Read More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":1771,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[298],"class_list":["post-1973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitcoin","tag-vulnerabilitatea-bitcoin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Unde este Bitcoin vulnerabil - Bitcoin Romania<\/title>\n<meta name=\"description\" content=\"Putem spune c\u0103 Bitcoin a evoluat \u00eendeajuns de mult \u00eenc\u00e2t oricine poate adopta Bitcoin.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bitcoinromania.ro\/blog\/unde-este-bitcoin-vulnerabil\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Unde este Bitcoin vulnerabil - 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