{"id":1277,"date":"2014-07-31T08:29:23","date_gmt":"2014-07-31T08:29:23","guid":{"rendered":"http:\/\/bitcoinromania.ro\/?p=1277"},"modified":"2026-03-01T13:46:48","modified_gmt":"2026-03-01T11:46:48","slug":"maleabilitatea-tranzactiilor-bitcoin","status":"publish","type":"post","link":"https:\/\/bitcoinromania.ro\/blog\/maleabilitatea-tranzactiilor-bitcoin\/","title":{"rendered":"Maleabilitatea tranzac\u021biilor Bitcoin"},"content":{"rendered":"

Re\u021beaua Bitcoin este o re\u021bea distribuit\u0103 de noduri controlate de o multitudine de proprietari. Ace\u0219tia implementeaz\u0103 \u00een mod colectiv un registru ce urm\u0103re\u0219te soldul adreselor tuturor utilizatorilor. Fiecare utilizator poate crea un num\u0103r arbitrar de adrese care pot fi folosite pentru a trimite sau primi Bitcoini. O adres\u0103 este derivat\u0103 dintr-o pereche de chei ECDSA care este mai t\u00e2rziu folosit\u0103 pentru a dovedi statutul de proprietar asupra Bitcoinilor asocia\u021bi cu adresa respectiv\u0103.<\/p>\n

Singura opera\u021bie permis\u0103 pentru modificarea soldurilor adreselor este tranzac\u021bia. O tranzac\u021bie este o structur\u0103 semnat\u0103 de informa\u021bii care pe de-o parte revendic\u0103 Bitcoinii asocia\u021bi cu o adres\u0103 de trimitere \u0219i pe de alt\u0103 parte \u00eei conecteaz\u0103 pe ace\u0219tia cu adresa de primire. Tranzac\u021biile pot fi identificate cu codul SHA256, iar o tranzac\u021bie este compus\u0103 din una sau mai multe intr\u0103ri \u0219i o list\u0103 ordinat\u0103 din una sau mai multe ie\u0219iri. Intrarea este folosit\u0103 pentru a specifica ce Bitcoini vor fi transfera\u021bi, \u00een timp ce o ie\u0219ire specific\u0103 adresa care ar trebui s\u0103 fie creditat\u0103 cu Bitcoinii ce urmeaz\u0103 s\u0103 fie transfera\u021bi.<\/p>\n

\"bitcoin_3\"<\/a><\/p>\n

Scripturi Bitcoin<\/h2>\n

Limbajul de scriptare este folosit pentru crearea de scenarii complexe pentru transferurile de Bitcoini. De exemplu, este posibil s\u0103 fie creat\u0103 o adres\u0103 multi-semnat\u0103 ce necesit\u0103 m din n semn\u0103turi pentru ca asocia\u021bii Bitcoini s\u0103 fie cheltui\u021bi pentru scopuri arbitrare. Cu toate acestea, marea majoritate a tranzac\u021biilor folosesc scripturi standard care seteaz\u0103 o condi\u021bie de revendicare ce necesit\u0103 o cheie public\u0103 care s\u0103 se potriveasc\u0103. Din acest motiv, scriptul standard este adesea cunoscut precum scriptSig ( un script ce conecteaz\u0103 o semn\u0103tur\u0103 ), unde condi\u021bia standard de revendicare este cunoscut\u0103 ca scriptPubKey ( un script ce necesit\u0103 o cheie public\u0103 \u0219i o semn\u0103tur\u0103 ).<\/p>\n

Interesul particular \u00een aceast\u0103 munc\u0103 sunt opera\u021biile OP_PUSHDATA ce specific\u0103 un num\u0103r de bi\u021bi care urmeaz\u0103 s\u0103 fie \u00eempin\u0219i c\u0103tre o \u201egr\u0103mad\u0103\u201d. \u00cen func\u021bie de durata procesului, una din posibilele alternative poate fi folosit\u0103. Cea mai simpl\u0103 este un singur bit cu valoare \u00eentre 0x00 \u0219i 0x4b, de asemenea denumit OP_0.<\/p>\n

Cu toate c\u0103 scriptSig sunt ata\u0219ate de intrarea tranzac\u021biei, acestea nu sunt cunoscute la timpul la care tranzac\u021bia a fost creat\u0103. De fapt, o semn\u0103tur\u0103 nu poate semna nicio informa\u021bie care o con\u021bine pe ea \u00eens\u0103\u0219i, iar acest lucru ar putea crea o dependen\u021b\u0103 circular\u0103. Pentru acest motiv, revendicarea scripturilor este \u00een mod consistent un singur OP_0 care \u00eempinge un element gol c\u0103tre respectiva gr\u0103mad\u0103.<\/p>\n

Pe l\u00e2ng\u0103 toate acestea, exist\u0103 foarte multe surse de maleabilitate \u00een scriptul de revendicare. \u00cen \u201eA Bitcoin Improvement Proposal\u201d de Wuille sunt identificate urm\u0103toarele posibilit\u0103\u021bi pentru a modifica semn\u0103tura \u0219i astfel s\u0103 fie exploatat\u0103 maleabilitatea.<\/p>\n

    \n
  1. Maleabilitatea semn\u0103turii ECDS: semn\u0103tura descrie puncte asupra unei curbe eliptice. \u00cencep\u00e2nd de la o semn\u0103tur\u0103 ce este trivial\u0103 pentru o derivare matematic\u0103, un al doilea set de parametri conecteaz\u0103 acela\u0219i punct la curba eliptic\u0103;<\/li>\n
  2. Semn\u0103turile ECDSA codificate Non-DER: libr\u0103ria criptografic\u0103 folosit\u0103 de clien\u021bii nucleului Bitcoin accept\u0103 o multitudine de formaturi pe l\u00e2ng\u0103 cele standardizate DER ( Distinguished Encoding Rules );<\/li>\n
  3. For\u021b\u0103ri suplimentare de date: un scriptPubKey poate for\u021ba informa\u021bii adi\u021bionale la \u00eenceputul scriptului. Acestea nu sunt consumate de condi\u021bia de revendicare corespondent\u0103 \u0219i sunt pur \u0219i simplu uitate acolo dup\u0103 ce scriptul este finalizat.<\/li>\n
  4. Semn\u0103tura \u0219i cheile publice pot rezulta dintr-un script mai complex care de fapt nu \u00eempinge informa\u021bia c\u0103tre gr\u0103mada respectiv\u0103, \u00eens\u0103 le calculeaz\u0103 ca \u0219i cum acestea ar fi divizate \u00een dou\u0103 sau mai multe buc\u0103\u021bi de aceea\u0219i dimensiune.<\/li>\n
  5. Codificarea non-minimal\u0103 ale opera\u021biunilor de \u201efor\u021bare\u201d: a\u0219a cum a fost men\u021bionat mai devreme, exist\u0103 c\u00e2teva opera\u021biuni pentru a specifica opera\u021biunile identice;<\/li>\n
  6. Numerele folosite f\u0103r\u0103 spa\u021biere: \u0219irurile de numere care sunt folosite f\u0103r\u0103 spa\u021biere sunt considerate numere;<\/li>\n
  7. Datele ignorate de scripturi: dac\u0103 o informa\u021bie este ignorat\u0103 de scriptPubKey \u2013 dac\u0103 acesta con\u021bine OP_DROP, respectiva opera\u021bie \u00een scriptSig este ignorat\u0103;<\/li>\n
  8. Steagul sighash poate fi utilizat pentru a ignora anumit\u0103 p\u0103r\u021bi ale unui script atunci c\u00e2nd procesul semn\u0103turii se deruleaz\u0103;<\/li>\n
  9. Orice utilizator cu acces la cheia privat\u0103 poate genera un num\u0103r arbitrar de semn\u0103turi valide precum procesul de semnare ECDSA ce folose\u0219te un generator aleatoriu de numere pentru a crea semn\u0103turi.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Re\u021beaua Bitcoin este o re\u021bea distribuit\u0103 de noduri controlate de o multitudine de proprietari. Ace\u0219tia implementeaz\u0103 \u00een mod colectiv un registru ce urm\u0103re\u0219te soldul adreselor tuturor utilizatorilor. Fiecare utilizator poate crea un num\u0103r arbitrar de adrese care pot fi folosite pentru a trimite sau primi Bitcoini. O adres\u0103 este derivat\u0103 dintr-o pereche de chei ECDSA care este mai t\u00e2rziu folosit\u0103 pentru a dovedi statutul de proprietar asupra Bitcoinilor asocia\u021bi cu adresa respectiv\u0103. Singura opera\u021bie permis\u0103 pentru modificarea soldurilor adreselor esteRead More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":1279,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[265],"class_list":["post-1277","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitcoin","tag-maleabilitatea-tranzactiilor"],"yoast_head":"\nMaleabilitatea tranzac\u021biilor Bitcoin - Bitcoin Romania<\/title>\n<meta name=\"description\" content=\"Marea majoritate a tranzac\u021biilor folosesc scripturi standard care seteaz\u0103 o condi\u021bie de revendicare ce necesit\u0103 o cheie public\u0103 care s\u0103 se potriveasc\u0103.\" \/>\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\/maleabilitatea-tranzactiilor-bitcoin\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Maleabilitatea tranzac\u021biilor Bitcoin - 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