{"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\/da\/blog\/administrirovanie\/corda-open-source-blokchejn-dlya-biznesa","title":{"rendered":"Corda \u2014 open source blockchain til erhvervslivet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/corda\/corda\">Corda<\/a><\/noindex> \u2014 er et distribueret ledger til opbevaring, administration og synkronisering af finansielle forpligtelser mellem forskellige finansielle organisationer.<br \/>\n<img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" 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 har en rimelig god dokumentation med video-forel\u00e6sninger, som kan findes <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.corda.net\/index.html\">her<\/a><\/noindex>. Jeg vil fors\u00f8ge kort at beskrive, hvordan Corda fungerer indeni.<\/p>\n<p>Lad os se p\u00e5 de vigtigste funktioner ved Corda og dets unikke egenskaber blandt andre blockchains:<\/p>\n<ul>\n<li>Corda har ikke sin egen kryptovaluta. <\/li>\n<li>Corda bruger ikke konceptet mining og Proof-of-Work-systemet.<\/li>\n<li>Dataoverf\u00f8rsel sker kun mellem deltagerne i transaktionen\/kontrakten. Der er ingen global broadcasting til alle noder i netv\u00e6rket. <\/li>\n<li>Der er ingen central controller, der styrer alle transaktioner.<\/li>\n<li>Corda underst\u00f8tter forskellige konsensusmekanismer.<\/li>\n<li>Konsensus opn\u00e5s mellem deltagerne p\u00e5 niveauet af en enkelt aftale\/kontrakt, og ikke p\u00e5 niveauet for hele systemet.<\/li>\n<li>Transaktionen bekr\u00e6ftes kun af de deltagere, der er relateret til den.<\/li>\n<li>Corda tilbyder direkte forbindelse mellem formelt juridisk sprog og smart contracts kode.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Ledger<\/h3>\n<p>\nBegrebet ledger i Corda er subjektivt. Der er ingen central lagerbygning for data. I stedet underst\u00f8tter hver node en separat database af de fakta, den kender.<\/p>\n<p>For eksempel, forestil dig et netv\u00e6rk af 5 noder, hvor en cirkel er et kendt faktum for noden.<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/538ca02bcd0488dbcf626d4e9bc704f2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSom vi ser, kender Ed, Carl og Demi til faktum 3, mens Alice og Bob ikke engang har mistanke om det. Corda sikrer, at f\u00e6lles fakta bevares i hver nodes database, og dataene vil v\u00e6re identiske. <\/p>\n<h3>Statuser<\/h3>\n<p>\nStatus er <i>uforanderlig<\/i> et objekt, der repr\u00e6senterer et faktum, der er kendt af en eller flere noder i netv\u00e6rket p\u00e5 et givet tidspunkt.<\/p>\n<p>Statuser kan indeholde vilk\u00e5rlige data, s\u00e5som aktier, obligationer, l\u00e5n, identifikationsoplysninger.<\/p>\n<p>For eksempel repr\u00e6senterer f\u00f8lgende status et IOU \u2014 en aftale om, at Alice skylder Bob et bel\u00f8b X:<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/19375664e05d42eb646dfbcab2c0638a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nLivscyklussen for et faktum over tid pr\u00e6senteres som en sekvens af statuser. N\u00e5r det nuv\u00e6rende stat skal opdateres, opretter vi en ny, mens den nuv\u00e6rende betegnes som historisk (historic).<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/f3ab2bd8a7c4cb6df40f003aa88cc0fd.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Transaktioner<\/h3>\n<p>\nTransaktioner er forslag til opdatering af ledgeren. De broadcastes ikke til alle deltagere i ledgeren og er kun tilg\u00e6ngelige for de deltagere i netv\u00e6rket, der har lovligt ret til at se og h\u00e5ndtere dem.<\/p>\n<p>Transaktionen vil blive tilf\u00f8jet til ledgeren, hvis den er:<\/p>\n<ul>\n<li>kontraktligt gyldig<\/li>\n<li>underskrevet af alle n\u00f8dvendige deltagere<\/li>\n<li>ikke indeholder dobbeltforbrug (double-spends)<\/li>\n<\/ul>\n<p>\nCorda bruger UTXO-modellen (unspent transaction output), hvor hver tilstand af ledgeren er uforanderlig. <\/p>\n<p>Ved oprettelse modtager transaktionen output-tilstanden fra den tidligere transaktion (via hash og indeks).<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/f26706fc6ae514926ab7cc3d1e18aef7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nTransaktionens livscyklus:<\/p>\n<ul>\n<li>Oprettelse (I \u00f8jeblikket er transaktionen kun et forslag til opdatering af ledgeren) <\/li>\n<li>Indsamling af underskrifter (De n\u00f8dvendige deltagere i transaktionen godkender forslaget til opdatering ved at tilf\u00f8je en underskrift til transaktionen)<\/li>\n<li>Commit af transaktionen til ledgeren<\/li>\n<\/ul>\n<p>\nEfter tilf\u00f8jelse af transaktionen til ledgeren markeres indgangsforholdene som historiske og kan ikke bruges i fremtidige transaktioner.<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/b2525d6861369163bedddcc4662d2f5b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nUdover indgangs- og udgangsforhold kan transaktionen indeholde:<\/p>\n<ul>\n<li>Kommandoer (transaktionsparameteren, der angiver m\u00e5let for transaktionen) <\/li>\n<li>Bilag (kalender for helligdage, valutakonverter) <\/li>\n<li>Tidsvinduer (gyldighedsperiode)<\/li>\n<li>Notarius (Notary, s\u00e6rlige deltagere i netv\u00e6rket, der validerer transaktioner) <\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/776d3d738f344acc65182e5dc67d9673.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h3>Kontrakter<\/h3>\n<p>\nN\u00e5r vi taler om gyldigheden af en transaktion, mener vi ikke kun tilstedev\u00e6relsen af n\u00f8dvendige underskrifter, men ogs\u00e5 gyldigheden i henhold til kontrakten. Hver transaktion er knyttet til en kontrakt, der accepterer den og validerer indgangs- og udgangsforhold. En transaktion betragtes kun som gyldig, hvis alle dens forhold er gyldige.<\/p>\n<p>Kontrakter i Corda skrives p\u00e5 ethvert JVM-sprog (f.eks. 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>\nDet er n\u00f8dvendigt at arve fra klassen <i>Contract<\/i> og overskrive metoden <i>verify<\/i>. I tilf\u00e6lde af ugyldighed af transaktionen skal der kastes en undtagelse.<\/p>\n<p>Validering af transaktioner skal v\u00e6re deterministisk, d.v.s. kontrakten skal altid enten acceptere eller afvise transaktionen. Derfor kan gyldigheden af transaktionen ikke afh\u00e6nge af tid, tilf\u00e6ldige tal, filer fra netv\u00e6rksnoder m.m.<\/p>\n<p>I Corda udf\u00f8res kontrakter i det s\u00e5kaldte sandkassemilj\u00f8 \u2014 en lidt \u00e6ndret JVM, der sikrer deterministisk udf\u00f8relse af kontrakter. <\/p>\n<h3>Str\u00f8mme<\/h3>\n<p>\nFor at automatisere kommunikationen mellem netv\u00e6rksnoder blev str\u00f8mme tilf\u00f8jet.<\/p>\n<p>En str\u00f8m er en sekvens af trin, der instruerer noden i, hvordan man udf\u00f8rer en bestemt opdatering af ledgeren, hvorn\u00e5r man skal underskrive og validere transaktionen.<\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/f23038fa73013d5cb2b3b980cd43a326.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNogle gange kr\u00e6ver det timer eller dage, f\u00f8r en transaktion er underskrevet af alle parter og registreret i ledgeren. Hvad sker der, hvis man slukker for en node, der deltager i transaktionen? Str\u00f8mme har kontrolpunkter, hvor str\u00f8mtilstande gemmes i nodens database. N\u00e5r noden genoprettes i netv\u00e6rket, vil den forts\u00e6tte der, hvor den stoppede.<\/p>\n<h3>Konsensus<\/h3>\n<p>\nFor at komme ind i ledgeren skal transaktionen opn\u00e5 to konsensus: om gyldighed og om unikhed.<\/p>\n<p>Beslutningen om transaktionens gyldighed tages kun af de parter, der er direkte involveret.<\/p>\n<p>Notari-noderne kontrollerer transaktionen for unikhed og forhindrer dobbeltforbrug.<\/p>\n<p>Forestil dig, at Bob har 100$, og han \u00f8nsker at overf\u00f8re 80$ til Charlie og 70$ til Dan ved hj\u00e6lp af den samme indgangsstatus. <\/p>\n<p><img decoding=\"async\" alt=\"Corda \u2014 open source blockchain til erhvervslivet\" src=\"\/wp-content\/uploads\/2019\/05\/159a5b0f2a5c1e38f52d7739707efa8a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDenne trick fungerer ikke med Corda. Selvom transaktionen g\u00e5r igennem gyldighedskontrollen, vil unikhedskontrollen fejle. <\/p>\n<h3>Konklusion<\/h3>\n<p>\nCorda-platformen, udviklet af blockchain-konsortiet R3, er ikke et rent eksempel p\u00e5 brug af blockchain-teknologi. Corda er et tilstr\u00e6kkeligt specialiseret v\u00e6rkt\u00f8j til finansielle institutioner.<br \/>\n<br \/>Kilde: <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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