{"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\/it\/blog\/administrirovanie\/ob-orakulah-dlya-blokchejnov-i-nemnogo-o-web3","title":{"rendered":"Sugli oracoli per i blockchain e un po' su Web3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Attualmente, le blockchain sono fortemente isolate da fonti esterne di informazione, sia da risorse centralizzate che da altre blockchain. Per consentire alle diverse catene di blocchi di essere compatibili e di scambiarsi dati facilmente tra loro (e con risorse esterne), si possono utilizzare gli oracoli. <\/p>\n<p><img decoding=\"async\" alt=\"Sugli oracoli per i blockchain e un po&#039; su 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>Cosa sono gli oracoli<\/h3>\n<p>\nUn oracolo \u00e8 un sistema che riceve e verifica eventi esterni alla blockchain e trasmette questi dati nella blockchain per l'uso nei contratti smart (o viceversa). Gli oracoli sono critici per i contratti smart, poich\u00e9 questi ultimi sono rigorosamente deterministici. Le informazioni devono arrivare nel contratto smart attraverso un canale specifico, in grado di confermarne l'affidabilit\u00e0. <\/p>\n<p>Esistono diversi tipi di oracoli, che forniscono vari tipi di collegamenti:<\/p>\n<ul>\n<li>software \u2014 ricevono dati da internet o da altre blockchain;<\/li>\n<li>hardware \u2014 ricevono dati da vari sensori (<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/RFID\">RFID<\/a><\/noindex> etichette, smart home; a me vengono subito in mente applicazioni nella logistica e nell'IoT);\n<p><i>Esempio: nel contratto smart \u00e8 necessario trasmettere dati sulla temperatura dell'aria. Possono essere ottenuti da internet attraverso un oracolo software, oppure da un sensore IoT tramite un oracolo hardware. *IoT \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/trends.rbc.ru\/trends\/industry\/5db96f769a7947561444f118\">Internet of Things.<\/a><\/noindex><\/i><\/li>\n<\/ul>\n<p><\/p>\n<ul>\n<li>inbound \u2014 dall'esterno della blockchain al contratto smart;<\/li>\n<li>outbound \u2014 dal contratto smart a una certa risorsa;<\/li>\n<\/ul>\n<p>\nA volte si utilizzano oracoli di consenso. Diversi oracoli ottengono dati in modo indipendente e poi determinano i dati in uscita tramite un certo algoritmo. <\/p>\n<p><i>Esempio di come funziona: 3 oracoli ricevono il tasso BTC\/USD da Binance, BitMex e Coinbase, e trasmettono la media come risultato. Questo smussa le piccole discrepanze tra gli scambi.<\/i><\/p>\n<h2>Web3<\/h2>\n<p>\nParlando degli oracoli e delle loro implementazioni, non si pu\u00f2 ignorare Web3, la concezione per la quale sono stati progettati. Inizialmente, Web3 era l'idea del web semantico, in cui ogni sito era contrassegnato da metadati per migliorare l'interazione con i motori di ricerca. Tuttavia, l'idea moderna di Web3 \u00e8 una rete composta da dApps. E le applicazioni decentralizzate hanno bisogno di oracoli.<\/p>\n<p><img decoding=\"async\" alt=\"Sugli oracoli per i blockchain e un po&#039; su Web3\" src=\"\/wp-content\/uploads\/2020\/08\/9a562a87082126bfe5a1f736a4ffd0ae.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00c8 possibile creare un oracolo autonomamente (e, in alcuni casi, necessario), ma ci sono alcuni oracoli frequentemente utilizzati (ad esempio, il generatore di numeri casuali), quindi \u00e8 vantaggioso utilizzare progetti oracolo. I due principali (al momento attuale) progetti che sviluppano oracoli sono: <noindex><a rel=\"nofollow\" href=\"https:\/\/bandprotocol.com\/\">Band<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/chain.link\/\">Chainlink<\/a><\/noindex>. <\/p>\n<h2>Band Protocol<\/h2>\n<p>\nBand Protocol funziona su un algoritmo di consenso dPoS (<noindex><a rel=\"nofollow\" href=\"https:\/\/academy.binance.com\/ru\/blockchain\/delegated-proof-of-stake-explained\">che cos'\u00e8?<\/a><\/noindex>) e i fornitori di dati rispondono per l'autenticit\u00e0 con denaro, non solo reputazione.<\/p>\n<p>Nell'ecosistema del progetto ci sono tre tipi di utenti:<\/p>\n<ul>\n<li>Fornitori di dati, che lavorano in modo indipendente sulla trasmissione sicura dei dati dall'esterno della blockchain alla catena di blocchi. I detentori di token scommettono sui fornitori di dati per dare loro il diritto di trasmettere i dati nel protocollo.<\/li>\n<li>Sviluppatori di dApp, che pagano piccole commissioni per utilizzare l'oracolo.<\/li>\n<li>Detentori di token Band, che votano per i fornitori di dati. Votando con i loro token per un fornitore, ricevono una ricompensa dai fondi pagati dalle dApps.<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Sugli oracoli per i blockchain e un po&#039; su Web3\" src=\"\/wp-content\/uploads\/2020\/08\/f752795cbac32004e2a76ba7a95d5d0d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTra gli oracoli offerti da Band \"out of the box\": orari di decollo\/atterraggio degli aerei, mappa meteorologica, tassi delle criptovalute, tassi dell'oro e delle azioni, informazioni sui blocchi di bitcoin, prezzo medio del gas, volumi sugli exchange di criptovalute, generatore di numeri casuali, Yahoo Finance, HTTP Status Code.<\/p>\n<p>A proposito, tra gli investitori di Band c'\u00e8 il leggendario fondo di venture capital <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sequoiacap.com\/\">Sequoia<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.binance.com\/\">Binance<\/a><\/noindex>. <\/p>\n<h2>Chainlink<\/h2>\n<p>\nIn generale, Chainlink e Band sono molto simili \u2014 sia nelle soluzioni predefinite, sia nelle possibilit\u00e0 di sviluppo. Chainlink \u00e8 pi\u00f9 semplice da usare, non prevede votazioni per i fornitori di informazioni, mentre Band \u00e8 pi\u00f9 flessibile perch\u00e9 utilizza <noindex><a rel=\"nofollow\" href=\"https:\/\/cosmos.network\/sdk\">Cosmos SDK<\/a><\/noindex> ed \u00e8 100% open source. <\/p>\n<p>Al momento, Chainlink \u00e8 significativamente pi\u00f9 popolare, nella lista dei partner del progetto ci sono Google Cloud, Binance, Matic Network e Polkadot. Inoltre, Chainlink si \u00e8 concentrato sugli oracoli per il settore <noindex><a rel=\"nofollow\" href=\"https:\/\/forklog.com\/chto-takoe-detsentralizovannye-finansy-defi\/\">DeFi<\/a><\/noindex>, che sta attualmente crescendo rapidamente.<\/p>\n<p><img decoding=\"async\" alt=\"Sugli oracoli per i blockchain e un po&#039; su Web3\" src=\"\/wp-content\/uploads\/2020\/08\/ac663742aba41c9263c1453affc70e82.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Risorse dai cui dati possono essere ottenuti tramite l'oracolo di Chainlink.<br \/>\n<\/i><\/p>\n<h3>Conclusione<\/h3>\n<p>\nGli oracoli sono un'ottima idea per ottenere dati da risorse centralizzate nella blockchain, e seguir\u00f2 attentamente il loro sviluppo. Tuttavia, quando si parla di interoperabilit\u00e0 tra diverse blockchain, ci sono altre soluzioni, inclusi i parachain (una tecnologia ancora pi\u00f9 promettente e tema del mio prossimo post). <\/p>\n<p>Per chi vuole approfondire: <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.bandchain.org\/\">Documentazione Band<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.chain.link\/docs\/getting-started\">Documentazione Chainlink<\/a><\/noindex>.<br \/>\n<br \/>Fonte: <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 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[&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 5.0.1.1 - 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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