{"id":33870,"date":"2019-10-31T21:55:08","date_gmt":"2019-10-31T18:55:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/corda-open-source-blokchejn-dlya-biznesa\/"},"modified":"2019-10-31T21:55:08","modified_gmt":"2019-10-31T18:55:08","slug":"corda-open-source-blokchejn-dlya-biznesa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/corda-open-source-blokchejn-dlya-biznesa","title":{"rendered":"Corda \u2014 open source blockchain pre biznis","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/corda\/corda\">Corda<\/a><\/noindex> \u2014 je distribuovan\u00fd ledger na uchov\u00e1vanie, spr\u00e1vu a synchroniz\u00e1ciu finan\u010dn\u00fdch z\u00e1v\u00e4zkov medzi r\u00f4znymi finan\u010dn\u00fdmi organiz\u00e1ciami.<br \/>\n<img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/4dd7c4b5e177c7fdc59eef739a052bb3.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex>Corda m\u00e1 dostato\u010dne kvalitn\u00fa dokument\u00e1ciu s video predn\u00e1\u0161kami, ktor\u00fa mo\u017eno n\u00e1js\u0165 <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.corda.net\/index.html\">tu<\/a><\/noindex>. Pok\u00fasim sa stru\u010dne op\u00edsa\u0165, ako je Corda zostaven\u00e1 interne.<\/p>\n<p>Pozrime sa na hlavn\u00e9 rysy Corda a jeho jedine\u010dnos\u0165 medzi ostatn\u00fdmi blockchainmi:<\/p>\n<ul>\n<li>Corda nem\u00e1 vlastn\u00fa kryptomenu. <\/li>\n<li>Corda nevyu\u017e\u00edva koncept \u0165a\u017eby a syst\u00e9m Proof-of-Work.<\/li>\n<li>Prenos \u00fadajov prebieha iba medzi \u00fa\u010dastn\u00edkmi transakcie\/zmluvy. Tu nie je glob\u00e1lne vysielanie v\u0161etk\u00fdm uzlom siete. <\/li>\n<li>Nie je centr\u00e1lny kontrol\u00f3r, ktor\u00fd by spravoval v\u0161etky transakcie.<\/li>\n<li>Corda podporuje r\u00f4zne mechanizmy konsenzu.<\/li>\n<li>Konsenzus sa dosahuje medzi \u00fa\u010dastn\u00edkmi na \u00farovni jednotliv\u00fdch zml\u00fav, nie na \u00farovni cel\u00e9ho syst\u00e9mu.<\/li>\n<li>Transakcia je potvrden\u00e1 iba \u00fa\u010dastn\u00edkmi, ktor\u00fdch sa t\u00fdka.<\/li>\n<li>Corda pon\u00faka priamu v\u00e4zbu medzi form\u00e1lnym pr\u00e1vnym jazykom a k\u00f3dom smart zml\u00fav.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Ledger<\/h3>\n<p>\nPojem ledger v Corda je subjekt\u00edvny. Nie je \u017eiadne jednotn\u00e9 centr\u00e1lne \u00falo\u017eisko \u00fadajov. Namiesto toho ka\u017ed\u00fd uzol udr\u017eiava samostatn\u00fa datab\u00e1zu zn\u00e1mych faktov.<\/p>\n<p>Napr\u00edklad si predstavte sie\u0165 zo 5 uzlov, kde kruh predstavuje fakt zn\u00e1my uzlu.<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/538ca02bcd0488dbcf626d4e9bc704f2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAko vid\u00edme, Ed, Carl a Demi poznaj\u00fa fakt 3, zatia\u013e \u010do Alice a Bob o \u0148om ani netu\u0161ia. Corda zaru\u010duje zachovanie spolo\u010dn\u00fdch faktov v datab\u00e1ze ka\u017ed\u00e9ho uzla, pri\u010dom \u00fadaje bud\u00fa identick\u00e9. <\/p>\n<h3>Stavy<\/h3>\n<p>\nStav \u2014 je to <i>nezmenite\u013en\u00fd<\/i> objekt, ktor\u00fd predstavuje fakt zn\u00e1my jedn\u00e9mu alebo viacer\u00fdm uzlom siete v ur\u010ditom okamihu.<\/p>\n<p>Stavy m\u00f4\u017eu uchov\u00e1va\u0165 \u013eubovo\u013en\u00e9 \u00fadaje, napr\u00edklad akcie, dlhopisy, \u00favery, identifika\u010dn\u00e9 inform\u00e1cie.<\/p>\n<p>Napr\u00edklad nasleduj\u00faci stav predstavuje IOU \u2014 dohodu, \u017ee Alice dlhuje Bobovi sumu X:<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/19375664e05d42eb646dfbcab2c0638a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n\u017divotn\u00fd cyklus faktu v priebehu \u010dasu je predlo\u017een\u00fd sekvenciou stavov. Ke\u010f je potrebn\u00e9 aktualizova\u0165 aktu\u00e1lny stav, vytvor\u00edme nov\u00fd, pri\u010dom aktu\u00e1lny ozna\u010d\u00edme ako historick\u00fd (historic).<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/f3ab2bd8a7c4cb6df40f003aa88cc0fd.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Transakcie<\/h3>\n<p>\nTransakcie s\u00fa n\u00e1vrhy na aktualiz\u00e1ciu ledgeru. Nie s\u00fa vysielan\u00e9 v\u0161etk\u00fdm \u00fa\u010dastn\u00edkom ledgeru a s\u00fa pr\u00edstupn\u00e9 iba t\u00fdm \u00fa\u010dastn\u00edkom siete, ktor\u00ed maj\u00fa z\u00e1konn\u00e9 pr\u00e1vo na ich zobrazenie a spr\u00e1vu.<\/p>\n<p>Transakcia bude pridan\u00e1 do ledgeru, ak je:<\/p>\n<ul>\n<li>kontraktne platn\u00e1<\/li>\n<li>podp\u00edsan\u00e1 v\u0161etk\u00fdmi potrebn\u00fdmi \u00fa\u010dastn\u00edkmi<\/li>\n<li>neobsahuje dvojit\u00e9 v\u00fddavky (doba-spends)<\/li>\n<\/ul>\n<p>\nCorda pou\u017e\u00edva model UTXO (nevy\u010derpan\u00fd v\u00fdstup transakcie), v ktorom je ka\u017ed\u00fd stav ledgeru nemenn\u00fd. <\/p>\n<p>Pri vytv\u00e1ran\u00ed sa do transakcie odovzd\u00e1va v\u00fdstupn\u00fd stav predch\u00e1dzaj\u00facej transakcie (pod\u013ea hash a indexu).<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/f26706fc6ae514926ab7cc3d1e18aef7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n\u017divotn\u00fd cyklus transakcie:<\/p>\n<ul>\n<li>Vytvorenie (Moment\u00e1lne je transakcia len n\u00e1vrh na aktualiz\u00e1ciu ledgeru) <\/li>\n<li>Zber podpisov (Potrebn\u00ed \u00fa\u010dastn\u00edci transakcie schva\u013euj\u00fa n\u00e1vrh na aktualiz\u00e1ciu pridan\u00edm podpisu k transakcii)<\/li>\n<li>Zavedenie transakcie do ledgeru<\/li>\n<\/ul>\n<p>\nPo pridan\u00ed transakcie do ledgeru s\u00fa vstupn\u00e9 stavy ozna\u010den\u00e9 ako historick\u00e9 a nem\u00f4\u017eu by\u0165 pou\u017eit\u00e9 v bud\u00facich transakci\u00e1ch.<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/b2525d6861369163bedddcc4662d2f5b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nOkrem vstupn\u00fdch a v\u00fdstupn\u00fdch stavov m\u00f4\u017ee transakcia obsahova\u0165:<\/p>\n<ul>\n<li>Pr\u00edkazy (parametriz\u00e1cia transakcie, ur\u010duje cie\u013e transakcie) <\/li>\n<li>Pr\u00edlohy (kalend\u00e1r sviatkov, konvertor mien) <\/li>\n<li>\u010casov\u00e9 okn\u00e1 (platnos\u0165)<\/li>\n<li>Not\u00e1r (Notary, \u0161peci\u00e1lni \u00fa\u010dastn\u00edci siete, ktor\u00ed validuj\u00fa transakcie) <\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/776d3d738f344acc65182e5dc67d9673.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h3>Zmluvy<\/h3>\n<p>\nKe\u010f hovor\u00edme o platnosti transakcie, m\u00e1me na mysli nielen pr\u00edtomnos\u0165 potrebn\u00fdch podpisov, ale aj platnos\u0165 pod\u013ea zmluvy. Ka\u017ed\u00e1 transakcia je spojen\u00e1 so zmluvou, ktor\u00e1 ju prij\u00edma a validuje vstupn\u00e9 a v\u00fdstupn\u00e9 stavy. Transakcia sa pova\u017euje za platn\u00fa iba vtedy, ke\u010f s\u00fa v\u0161etky jej stavy platn\u00e9.<\/p>\n<p>Zmluvy v Cord\u011b s\u00fa p\u00edsan\u00e9 v akomko\u013evek jazyku JVM (napr\u00edklad Java, Kotlin).<\/p>\n<pre><code class=\"kotlin\">class CommercialPaper : Contract {\n    override fun verify(tx: LedgerTransaction) {\n        TODO()\n    }\n}\n<\/code><\/pre>\n<p>\nJe potrebn\u00e9 dedi\u0165 z triedy <i>Contract<\/i> a predefinova\u0165 met\u00f3du <i>verify<\/i>. V pr\u00edpade neplatnosti transakcie by malo by\u0165 vyhoden\u00e9 v\u00fdnimku.<\/p>\n<p>Valid\u00e1cia transakci\u00ed mus\u00ed by\u0165 deterministick\u00e1, t.j. zmluva mus\u00ed v\u017edy bu\u010f prija\u0165, alebo odmietnu\u0165 transakciu. V s\u00favislosti s t\u00fdm platnos\u0165 transakcie nem\u00f4\u017ee z\u00e1visie\u0165 od \u010dasu, n\u00e1hodn\u00fdch \u010d\u00edsel, s\u00faborov uzla siete a podobne.<\/p>\n<p>V Cord\u011b sa zmluvy vykon\u00e1vaj\u00fa v takzvanej pieskovnici \u2014 mierne upravenej JVM, ktor\u00e1 zaru\u010duje deterministick\u00e9 vykonanie zml\u00fav. <\/p>\n<h3>Pr\u00fady<\/h3>\n<p>\nAby sa automatizovala komunik\u00e1cia uzlov siete, boli pridan\u00e9 pr\u00fady.<\/p>\n<p>Pr\u00fad je sekvencia krokov, ktor\u00e1 hovor\u00ed uzlu, ako vykona\u0165 konkr\u00e9tnu aktualiz\u00e1ciu ledgeru, kedy je potrebn\u00e9 podp\u00edsa\u0165 a validova\u0165 transakciu.<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/f23038fa73013d5cb2b3b980cd43a326.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNiekedy trv\u00e1 hodiny, dni, k\u00fdm transakcia podp\u00ed\u0161e v\u0161etk\u00fdmi stranami a dostane sa do ledgeru. \u010co sa stane, ak odpoj\u00edte uzol, ktor\u00fd sa z\u00fa\u010dast\u0148uje na transakcii? Pr\u00fady maj\u00fa kontroln\u00e9 body, kde sa stavy pr\u00fadu zapisuj\u00fa do datab\u00e1zy uzla. Po obnoven\u00ed uzla v sieti pokra\u010duje tam, kde prestal.<\/p>\n<h3>Konsenzus<\/h3>\n<p>\nAby sa transakcia dostala do ledgeru, mus\u00ed dosiahnu\u0165 dva konsenzusy: na platnos\u0165 a na jedine\u010dnos\u0165.<\/p>\n<p>Rozhodnutie o platnosti transakcie prij\u00edmaj\u00fa len strany, ktor\u00e9 s\u00fa do nej priamo zapojen\u00e9.<\/p>\n<p>Not\u00e1rske uzly overuj\u00fa transakciu na jedine\u010dnos\u0165 a predch\u00e1dzaj\u00fa dvojit\u00fdm v\u00fddavkom.<\/p>\n<p>Predstavme si, \u017ee Bob m\u00e1 100$ a chce previes\u0165 80$ Charlovi a 70$ Danovi, a to v\u0161etko z rovnak\u00e9ho vstupn\u00e9ho stavu. <\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain pre biznis\" src=\"\/wp-content\/uploads\/2019\/05\/159a5b0f2a5c1e38f52d7739707efa8a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTak\u00fdto trik Corda neumo\u017en\u00ed. Hoci transakcia prejde overen\u00edm na platnos\u0165, overenie na jedine\u010dnos\u0165 zlyh\u00e1. <\/p>\n<h3>Z\u00e1ver<\/h3>\n<p>\nPlatforma Corda, vyvinut\u00e1 blockchainov\u00fdm konzorciom R3, nie je \u010disto pr\u00edkladom pou\u017eitia technol\u00f3gie blockchain. Corda je dostato\u010dne \u00fazko \u0161pecializovan\u00fd n\u00e1stroj pre finan\u010dn\u00e9 organiz\u00e1cie.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/452258\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>Corda \u2014 \u044d\u0442\u043e \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0439 Ledger \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f, \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0444\u0438\u043d\u0430\u043d\u0441\u043e\u0432\u044b\u0445 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u0441\u0442\u0432 \u043c\u0435\u0436\u0434\u0443 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u043c\u0438 \u0444\u0438\u043d\u0430\u043d\u0441\u043e\u0432\u044b\u043c\u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438. \u0423 Corda \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0445\u043e\u0440\u043e\u0448\u0430\u044f \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u044f \u0441 \u0432\u0438\u0434\u0435\u043e-\u043b\u0435\u043a\u0446\u0438\u044f\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u0439\u0442\u0438 \u0437\u0434\u0435\u0441\u044c. \u042f \u043f\u043e\u0441\u0442\u0430\u0440\u0430\u044e\u0441\u044c \u043a\u0440\u0430\u0442\u043a\u043e \u043e\u043f\u0438\u0441\u0430\u0442\u044c \u043a\u0430\u043a \u0443\u0441\u0442\u0440\u043e\u0435\u043d Corda \u0432\u043d\u0443\u0442\u0440\u0438. \u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 Corda \u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0435\u0433\u043e \u0441\u0440\u0435\u0434\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d\u043e\u0432: \u0423 Corda \u043d\u0435\u0442 \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0439 \u043a\u0440\u0438\u043f\u0442\u043e\u0432\u0430\u043b\u044e\u0442\u044b. Corda \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043a\u043e\u043d\u0446\u0435\u043f\u0446\u0438\u044e \u043c\u0430\u0439\u043d\u0438\u043d\u0433\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25536,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33870","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Corda \u2014 \u044d\u0442\u043e \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0439 Ledger \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f, \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438 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