{"id":90631,"date":"2020-08-04T01:42:10","date_gmt":"2020-08-03T23:42:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/ob-orakulah-dlya-blokchejnov-i-nemnogo-o-web3"},"modified":"2020-08-04T01:42:10","modified_gmt":"2020-08-03T23:42:10","slug":"ob-orakulah-dlya-blokchejnov-i-nemnogo-o-web3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/ob-orakulah-dlya-blokchejnov-i-nemnogo-o-web3","title":{"rendered":"O orakl\u00edch pro blockchainy a trochu o Web3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V sou\u010dasn\u00e9 dob\u011b jsou blockchainy siln\u011b izolov\u00e1ny od extern\u00edch zdroj\u016f informac\u00ed \u2014 jak centralizovan\u00fdch zdroj\u016f, tak jin\u00fdch blockchain\u016f. Aby byly r\u016fzn\u00e9 blockchainy kompatibiln\u00ed a mohly si snadno zam\u011b\u0148ovat data mezi sebou (a s extern\u00edmi zdroji), mohou se vyu\u017e\u00edvat or\u00e1kula. <\/p>\n<p><img decoding=\"async\" alt=\"O orakl\u00edch pro blockchainy a trochu o Web3\" src=\"\/wp-content\/uploads\/2020\/08\/e543fd7b6bb7af69756880115d0dfbaf.png\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Co jsou or\u00e1kula<\/h3>\n<p>\nOr\u00e1kulum je syst\u00e9m, kter\u00fd z\u00edsk\u00e1v\u00e1 a ov\u011b\u0159uje ud\u00e1losti z vn\u011bj\u0161ku blockchainu a p\u0159ed\u00e1v\u00e1 tato data do blockchainu pro pou\u017eit\u00ed v smart kontraktech (nebo naopak). Or\u00e1kula jsou kriticky d\u016fle\u017eit\u00e1 pro smart kontrakty, proto\u017ee smart kontrakty jsou p\u0159\u00edsn\u011b deterministick\u00e9. Informace mus\u00ed do smart kontraktu p\u0159ich\u00e1zet p\u0159es ur\u010dit\u00fd kan\u00e1l, kter\u00fd je schopen potvrdit jej\u00ed pravdivost. <\/p>\n<p>Existuje n\u011bkolik typ\u016f or\u00e1kul, kter\u00e9 poskytuj\u00ed r\u016fzn\u00e9 formy spojen\u00ed:<\/p>\n<ul>\n<li>softwarov\u00e1 \u2014 z\u00edsk\u00e1vaj\u00ed data z internetu nebo z jin\u00fdch blockchain\u016f;<\/li>\n<li>hardwarov\u00e1 \u2014 z\u00edsk\u00e1vaj\u00ed data z r\u016fzn\u00fdch senzor\u016f (<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/RFID\">RFID<\/a><\/noindex> zna\u010dky, chytr\u00e1 dom\u00e1cnost, m\u011b osobn\u011b napad\u00e1 pou\u017eit\u00ed v logistice a IoT);\n<p><i>P\u0159\u00edklad: do smart kontraktu je pot\u0159ebn\u00e9 p\u0159edat data o teplot\u011b vzduchu. M\u016f\u017eete vz\u00edt data z internetu p\u0159es softwarov\u00e9 or\u00e1kulum, nebo ze senzoru IoT p\u0159es hardwarov\u00e9 or\u00e1kulum. *IoT \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/trends.rbc.ru\/trends\/industry\/5db96f769a7947561444f118\">Internet v\u011bc\u00ed.<\/a><\/noindex><\/i><\/li>\n<\/ul>\n<p><\/p>\n<ul>\n<li>p\u0159\u00edchoz\u00ed \u2014 z vn\u011bj\u0161ku blockchainu do smart kontraktu;<\/li>\n<li>odchoz\u00ed \u2014 ze smart kontraktu na n\u011bjak\u00fd zdroj;<\/li>\n<\/ul>\n<p>\nN\u011bkdy se pou\u017e\u00edvaj\u00ed konsensu\u00e1ln\u00ed or\u00e1kula. N\u011bkolik or\u00e1kul\u016f nez\u00e1visle z\u00edsk\u00e1v\u00e1 data a pot\u00e9 podle n\u011bjak\u00e9ho algoritmu ur\u010duj\u00ed v\u00fdstupn\u00ed data. <\/p>\n<p><i>P\u0159\u00edklad, pro\u010d je to pot\u0159ebn\u00e9: 3 or\u00e1kula z\u00edsk\u00e1vaj\u00ed kurz BTC\/USD z Binance, BitMex a Coinbase, a na v\u00fdstupu p\u0159ed\u00e1vaj\u00ed pr\u016fm\u011brnou hodnotu. T\u00edm se vyhlazuj\u00ed drobn\u00e9 nesrovnalosti mezi burzami.<\/i><\/p>\n<h2>Web3<\/h2>\n<p>\nP\u0159i hovo\u0159en\u00ed o or\u00e1kul\u00edch a jejich implementac\u00edch nelze opominout Web3, koncept, pro kter\u00fd byly vytv\u00e1\u0159eny. P\u016fvodn\u011b byl Web3 my\u0161lenkou s\u00e9mantick\u00e9ho webu, kde je ka\u017ed\u00e1 str\u00e1nka ozna\u010dena metadaty, aby se zlep\u0161ila interakce s vyhled\u00e1va\u010di. Modern\u00ed my\u0161lenka Web3 v\u0161ak je s\u00ed\u0165 slo\u017een\u00e1 z dApps. A decentralizovan\u00fdm aplikac\u00edm jsou pot\u0159eba or\u00e1kula.<\/p>\n<p><img decoding=\"async\" alt=\"O orakl\u00edch pro blockchainy a trochu o Web3\" src=\"\/wp-content\/uploads\/2020\/08\/9a562a87082126bfe5a1f736a4ffd0ae.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nO vytvo\u0159en\u00ed oracle se m\u016f\u017eete postarat sami (a v n\u011bkter\u00fdch p\u0159\u00edpadech je to nutn\u00e9), ale existuj\u00ed n\u011bkter\u00e9 \u010dasto pou\u017e\u00edvan\u00e9 oracle (nap\u0159\u00edklad gener\u00e1tor n\u00e1hodn\u00fdch \u010d\u00edsel), tak\u017ee se vyplat\u00ed vyu\u017e\u00edvat projekty oracle. Dva hlavn\u00ed (v tuto chv\u00edli) projekty vyv\u00edjej\u00edc\u00ed oracle jsou <noindex><a rel=\"nofollow\" href=\"https:\/\/bandprotocol.com\/\">Kapela<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/chain.link\/\">Chainlink<\/a><\/noindex>. <\/p>\n<h2>Band Protocol<\/h2>\n<p>\nBand Protocol funguje na algoritmu konsensu dPoS (<noindex><a rel=\"nofollow\" href=\"https:\/\/academy.binance.com\/ru\/blockchain\/delegated-proof-of-stake-explained\">co to je?<\/a><\/noindex>) a poskytovatel\u00e9 dat odpov\u00eddaj\u00ed za autenticitu pen\u011bzi, a ne jenom reputac\u00ed.<\/p>\n<p>V ekosyst\u00e9mu projektu existuj\u00ed t\u0159i typy u\u017eivatel\u016f:<\/p>\n<ul>\n<li>Poskytovatel\u00e9 dat, kte\u0159\u00ed nez\u00e1visle pracuj\u00ed na bezpe\u010dn\u00e9m p\u0159enosu dat z vn\u011bj\u0161\u00edho sv\u011bta do blockchainu. Dr\u017eitel\u00e9 token\u016f s\u00e1zej\u00ed na poskytovatele dat, aby jim poskytli pr\u00e1vo p\u0159en\u00e1\u0161et data do protokolu.<\/li>\n<li>V\u00fdvoj\u00e1\u0159i dApp, kte\u0159\u00ed plat\u00ed mal\u00e9 poplatky za pou\u017e\u00edv\u00e1n\u00ed oracle.<\/li>\n<li>Dr\u017eitel\u00e9 token\u016f Band, kte\u0159\u00ed hlasuj\u00ed za poskytovatele dat. Hlasov\u00e1n\u00edm sv\u00fdmi tokeny pro poskytovatele z\u00edsk\u00e1vaj\u00ed odm\u011bnu z finan\u010dn\u00edch prost\u0159edk\u016f, kter\u00e9 dApps vypl\u00e1cej\u00ed.<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"O orakl\u00edch pro blockchainy a trochu o Web3\" src=\"\/wp-content\/uploads\/2020\/08\/f752795cbac32004e2a76ba7a95d5d0d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMezi oracle dostupn\u00e9 v Band \u201eout of the box\u201c pat\u0159\u00ed: \u010dasy vzlet\u016f\/p\u0159ist\u00e1n\u00ed letadel, meteorologick\u00e9 mapy, kurzy kryptom\u011bn, ceny zlata a akci\u00ed, informace o bloc\u00edch bitcoinu, pr\u016fm\u011brn\u00e1 cena plynu, objemy na kryptoburz\u00e1ch, gener\u00e1tor n\u00e1hodn\u00fdch \u010d\u00edsel, Yahoo Finance, HTTP Status Code.<\/p>\n<p>Mimochodem, mezi investory Band je legend\u00e1rn\u00ed venture fond <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sequoiacap.com\/\">Sequoia<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.binance.com\/\">Binance<\/a><\/noindex>. <\/p>\n<h2>Chainlink<\/h2>\n<p>\nCelkov\u011b jsou Chainlink a Band velmi podobn\u00e9 \u2014 jak v defaultn\u00edch \u0159e\u0161en\u00edch, tak v mo\u017enostech v\u00fdvoje. Chainlink je jednodu\u0161\u0161\u00ed na pou\u017eit\u00ed, neobsahuje hlasov\u00e1n\u00ed za poskytovatele informac\u00ed, zat\u00edmco Band je flexibiln\u011bj\u0161\u00ed, proto\u017ee pou\u017e\u00edv\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/cosmos.network\/sdk\">Cosmos SDK<\/a><\/noindex> a je 100% open source. <\/p>\n<p>V sou\u010dasnosti je Chainlink daleko popul\u00e1rn\u011bj\u0161\u00ed, na seznamu partner\u016f projektu jsou Google Cloud, Binance, Matic Network a Polkadot. Chainlink se tak\u00e9 zam\u011b\u0159il na oracly pro oblast <noindex><a rel=\"nofollow\" href=\"https:\/\/forklog.com\/chto-takoe-detsentralizovannye-finansy-defi\/\">DeFi<\/a><\/noindex>, kter\u00e1 nyn\u00ed rychle roste.<\/p>\n<p><img decoding=\"async\" alt=\"O orakl\u00edch pro blockchainy a trochu o Web3\" src=\"\/wp-content\/uploads\/2020\/08\/ac663742aba41c9263c1453affc70e82.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Zdroje, jejich\u017e data lze z\u00edskat prost\u0159ednictv\u00edm oracle od Chainlink.<br \/>\n<\/i><\/p>\n<h3>Z\u00e1v\u011br<\/h3>\n<p>\nOracly jsou skv\u011bl\u00fd n\u00e1pad pro z\u00edsk\u00e1v\u00e1n\u00ed dat z centralizovan\u00fdch zdroj\u016f do blockchainu, a j\u00e1 budu toto v\u00fdvoj pe\u010dliv\u011b sledovat. Nicm\u00e9n\u011b pokud mluv\u00edme o vz\u00e1jemn\u00e9 kompatibilit\u011b r\u016fzn\u00fdch blockchain\u016f, existuj\u00ed jin\u00e1 \u0159e\u0161en\u00ed, v\u010detn\u011b parachain\u016f (je\u0161t\u011b slibn\u011bj\u0161\u00ed technologie a t\u00e9ma m\u00e9ho p\u0159\u00ed\u0161t\u00edho p\u0159\u00edsp\u011bvku). <\/p>\n<p>Pro ty, kte\u0159\u00ed cht\u011bj\u00ed j\u00edt hloub\u011bji: <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.bandchain.org\/\">Band Docs<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.chain.link\/docs\/getting-started\">Chainlink Docs<\/a><\/noindex>.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/513000\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d\u044b \u0441\u0438\u043b\u044c\u043d\u043e \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b \u043e\u0442 \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u0432 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u2014 \u043a\u0430\u043a \u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432, \u0442\u0430\u043a \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d\u043e\u0432. \u0427\u0442\u043e\u0431\u044b \u0440\u0430\u0437\u043d\u044b\u0435 \u0446\u0435\u043f\u043e\u0447\u043a\u0438 \u0431\u043b\u043e\u043a\u043e\u0432 \u0431\u044b\u043b\u0438 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u044b \u0438 \u043b\u0435\u0433\u043a\u043e \u043e\u0431\u043c\u0435\u043d\u0438\u0432\u0430\u043b\u0438\u0441\u044c \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u043c\u0435\u0436\u0434\u0443 \u0441\u043e\u0431\u043e\u0439 (\u0438 \u0441 \u0432\u043d\u0435\u0448\u043d\u0438\u043c\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u0430\u043c\u0438) \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043e\u0440\u0430\u043a\u0443\u043b\u043e\u0432. \u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 \u043e\u0440\u0430\u043a\u0443\u043b\u044b \u041e\u0440\u0430\u043a\u0443\u043b \u2014 \u044d\u0442\u043e \u0441\u0438\u0441\u0442\u0435\u043c\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u0438 \u0432\u0435\u0440\u0438\u0444\u0438\u0446\u0438\u0440\u0443\u0435\u0442 \u0441\u043e\u0431\u044b\u0442\u0438\u044f \u0438\u0437\u0432\u043d\u0435 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d\u0430 \u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0435\u0442 \u044d\u0442\u0438 \u0434\u0430\u043d\u043d\u044b\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":90632,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-90631","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=\"\u0412 \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d\u044b \u0441\u0438\u043b\u044c\u043d\u043e \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b \u043e\u0442 \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u0432 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u2014 \u043a\u0430\u043a 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