{"id":786,"date":"2024-05-27T13:21:23","date_gmt":"2024-05-27T13:21:23","guid":{"rendered":"https:\/\/www.techopedia.com\/pp\/?p=786"},"modified":"2024-10-16T13:48:06","modified_gmt":"2024-10-16T13:48:06","slug":"technologia-blockchain-co-to","status":"publish","type":"post","link":"https:\/\/www.techopedia.com\/pl\/technologia-blockchain-co-to","title":{"rendered":"Technologia blockchain: wprowadzenie"},"content":{"rendered":"

Jak dzia\u0142a technologia blockchain<\/a>? Podstawow\u0105 koncepcj\u0119 \u0142atwo zrozumie\u0107. Jest to spos\u00f3b przechowywania danych. Dane s\u0105 organizowane w pojedyncze bloki, kt\u00f3re \u0142\u0105cz\u0105 si\u0119 i tworz\u0105 \u0142a\u0144cuch blok\u00f3w<\/strong>. Nowe dane wprowadza si\u0119 do nowego bloku, zamiast nadpisywa\u0107 stare informacje.<\/p>\n

Dzi\u0119ki temu sie\u0107 blockchain zapewnia trwa\u0142\u0105, niepodlegaj\u0105c\u0105 edycji, chronologiczn\u0105 histori\u0119 zdarze\u0144.<\/p>\n

Jak u\u017cywa\u0107 technologii blockchain?<\/span><\/h2>\n

G\u0142\u00f3wnym zastosowaniem sieci blockchain jest rejestrowanie transakcji finansowych.<\/strong> Mo\u017ce by\u0107 te\u017c u\u017cywany do innych cel\u00f3w, takich jak \u0142a\u0144cuchy dostaw,<\/a> rejestry podr\u00f3\u017cy i dokumentacja prawna.<\/p>\n

Firma Iron Mountain informuje, \u017ce ponad 40 czo\u0142owych instytucji z bran\u017cy fintech i coraz wi\u0119cej firm z r\u00f3\u017cnych sektor\u00f3w eksperymentuje z technologi\u0105 rozproszonej bazy danych<\/a> (ang. DLT – distributed ledger technology).<\/p>\n

Czy u\u017cycie technologii blockchain jest bezpieczne?<\/span><\/h2>\n

Tak, blockchain<\/a> jest bezpieczny. Wielu nowicjuszy pyta: co powstrzymuje hakera przed w\u0142amaniem si\u0119 do \u0142a\u0144cucha i zmian\u0105 poszczeg\u00f3lnych blok\u00f3w?<\/p>\n

Rozproszona ksi\u0119ga<\/h3>\n

Wi\u0119kszo\u015b\u0107 cyfrowych rejestr\u00f3w jest scentralizowana na jednym solidnie zabezpieczonym serwerze. Natomiast blockchain jest <\/strong>zdecentralizowany,<\/strong> rozpisany na wielu, a nawet na tysi\u0105cach serwer\u00f3w.<\/strong><\/p>\n

Na pierwszy rzut oka mo\u017ce to wygl\u0105da\u0107 jak koszmar dla specjalisty ds. bezpiecze\u0144stwa. Jednak w praktyce jest inaczej.<\/p>\n

Zanim nowy blok danych zostanie dodany do \u0142a\u0144cucha, dany serwer weryfikuje zapisy z istniej\u0105cymi zapisami innych serwer\u00f3w. Je\u015bli co\u015b si\u0119 nie zgadza, \u0142a\u0144cuch jest wstrzymany, a ka\u017cda transakcja anulowana i wymaga ponownego sprawdzenia.<\/p>\n

Aby nielegalnie zmieni\u0107 blok, haker musia\u0142by w\u0142ama\u0107 si\u0119 do tysi\u0119cy serwer\u00f3w jednocze\u015bnie i wprowadzi\u0107 zmiany we wszystkich. Zadanie trudne, cho\u0107 mo\u017cliwe.<\/p>\n

Decentralizacja<\/h3>\n

Zalety sieci blockchain s\u0105 niezaprzeczalne. Bez centralnej kontroli rejestru technologia ma wiele zastosowa\u0144.<\/strong><\/p>\n

Na przyk\u0142ad klient chce dokona\u0107 zakupu, ale sie\u0107 banku jest nieczynna. Je\u015bli bank u\u017cywa w\u0142asnego, prywatnego rejestru, klient ma k\u0142opot.<\/p>\n

Natomiast je\u015bli bank korzysta z technologii blockchain, klient nadal mo\u017ce u\u017cy\u0107 karty kredytowej lub innej, dowolnej metody, aby uzyska\u0107 dost\u0119p do blockchaina banku.<\/p>\n

Mi\u0119dzy innymi dzi\u0119ki temu, blockchain to podstawa walut cyfrowych, takich jak Bitcoin<\/a> (BTC). Decentralizacja<\/a> czyli brak centralnej kontroli oznacza, \u017ce nikt nie mo\u017ce manipulowa\u0107 wymian\u0105 bitcoin\u00f3w dla w\u0142asnych korzy\u015bci.<\/p>\n

Minusy blockchain<\/h3>\n

Poza projektami opartymi stricte na kryptowalutach, wi\u0119kszo\u015b\u0107 organizacji nadal ostro\u017cnie podchodzi do technologii blockchain. Firmy przewa\u017cnie ograniczaj\u0105 si\u0119 do kilku pilota\u017cowych projekt\u00f3w. Nie wdra\u017caj\u0105 go jeszcze do g\u0142\u00f3wnych zastosowa\u0144 biznesowych.<\/p>\n

Opory przed pe\u0142nym wdro\u017ceniem mog\u0105 wynika\u0107 z przepis\u00f3w dotycz\u0105cych Zaufania, Zarz\u0105dzania, Ryzyka i Zgodno\u015bci. Wed\u0142ug Josepha Holbrooke’a, autora ksi\u0105\u017cki \u201cProjektowanie Zastosowa\u0144 Blockchain dla Przedsi\u0119biorstw\u201d (\u201eArchitecting Enterprise Blockchain Solutions\u201d):<\/p>\n

\u201eArchitekt blockchain<\/strong> napotka kilka problem\u00f3w zwi\u0105zanych z Og\u00f3lnym Rozporz\u0105dzeniem o Ochronie Danych, Ustaw\u0105 o Przeno\u015bno\u015bci i Odpowiedzialno\u015bci Ubezpiecze\u0144 Zdrowotnych z 1996 roku, Ustaw\u0105 Sarbanes-Oxley z 2002 roku – przepisami dotycz\u0105cymi Poznaj Swojego Klienta (Know Your Customer), zasadami przeciwdzia\u0142ania praniu pieni\u0119dzy i tym podobnym.\u201d<\/p><\/blockquote>\n

Nathaniel Popper z The New York Times uwa\u017ca, \u017ce najwi\u0119ksz\u0105 wad\u0105 blockchain jest to, \u017ce jest mniej wydajny, ni\u017c scentralizowane rozwi\u0105zania.<\/strong> Co za tym idzie, \u0142atwiejsze jest projektowanie niezawodnego oprogramowania do naprawy b\u0142\u0119d\u00f3w i uruchamianie nowych us\u0142ug.<\/p>\n

W przypadku komercyjnego oprogramowania mamy kogo\u015b do kogo mo\u017cna zadzwoni\u0107, gdy co\u015b idzie nie tak. W przypadku blockchain nie mamy takiej mo\u017cliwo\u015bci.<\/p>\n

U\u017cytkownik sieci nie b\u0119dzie m\u00f3g\u0142 nanie\u015b\u0107 w\u0142asnych poprawek na wielu rozproszonych serwerach, skrupulatnie zabezpieczonych przed ingerencj\u0105.<\/p>\n

Scentralizowane korporacje dobrze radz\u0105 sobie z tworzeniem niezawodnego oprogramowania i jego naprawie, w razie gdy co\u015b p\u00f3jdzie nie tak. W zdecentralizowanej sieci komputer\u00f3w<\/strong> i programist\u00f3w nie ma szefa<\/strong>, kt\u00f3ry zarz\u0105dzi\u0142by, \u017ce b\u0142\u0105d trzeba naprawi\u0107 w ci\u0105gu 20 minut.<\/p>\n

Czy blockchain jest poza prawem?<\/span><\/h2>\n

Tego rodzaju demokratyzacja sieci<\/strong> (czy mo\u017ce rozproszenie odpowiedzialno\u015bci?) r\u00f3wnie\u017c stanowi problem w \u015bwietle prawa. W scentralizowanej, uregulowanej spo\u0142eczno\u015bci mo\u017cna skutecznie wykluczy\u0107 zagro\u017cenia. Nie jest to takie \u0142atwe w przypadku blockchaina.<\/p>\n

Do tej pory us\u0142ugi korzystaj\u0105ce z oprogramowania Tor i licznych wersji czarno rynkowych gie\u0142d, wykorzystuj\u0105 blokchain zar\u00f3wno do legalnych i nielegalnych cel\u00f3w.<\/strong> Us\u0142ugi te pojawi\u0142y si\u0119 po zlikwidowaniu w 2014 roku Silk Road darknet.<\/p>\n

Prawdopodobnie najwa\u017cniejszym elementem jest jednak kryptografia<\/strong><\/a>, kt\u00f3ra powinna obejmowa\u0107 najbardziej zaufane, nieodwracalne algorytmy hash<\/strong> i narz\u0119dzia do nadpisywania oraz weryfikacji kluczy publicznych.<\/p>\n

Do\u015bwiadczenie pokazuje, \u017ce wi\u0119kszo\u015b\u0107 dotychczasowych narusze\u0144 blockchain wynika\u0142a z b\u0142\u0119d\u00f3w wprowadzonych przez wadliw\u0105 implementacj\u0119. Zdarza\u0142y si\u0119 te\u017c ataki na warstw\u0119 sieci (network layer), niedoci\u0105gni\u0119cia w in\u017cynierii spo\u0142ecznej (social engineering) i problemy z zabezpieczeniami pami\u0119ci.<\/p>\n","protected":false},"excerpt":{"rendered":"

Jak dzia\u0142a technologia blockchain? Podstawow\u0105 koncepcj\u0119 \u0142atwo zrozumie\u0107. Jest to spos\u00f3b przechowywania danych. Dane s\u0105 organizowane w pojedyncze bloki, kt\u00f3re \u0142\u0105cz\u0105 si\u0119 i tworz\u0105 \u0142a\u0144cuch blok\u00f3w. Nowe dane wprowadza si\u0119 do nowego bloku, zamiast nadpisywa\u0107 stare informacje. Dzi\u0119ki temu sie\u0107 blockchain zapewnia trwa\u0142\u0105, niepodlegaj\u0105c\u0105 edycji, chronologiczn\u0105 histori\u0119 zdarze\u0144. Jak u\u017cywa\u0107 technologii blockchain? G\u0142\u00f3wnym zastosowaniem sieci […]<\/p>\n","protected":false},"author":286618,"featured_media":1306,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[106,22],"tags":[],"class_list":["post-786","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchain","category-kryptowaluty"],"acf":[],"yoast_head":"\nTechnologia blockchain - co to jest? 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