{"id":3763,"date":"2021-12-15T11:07:29","date_gmt":"2021-12-15T11:07:29","guid":{"rendered":"https:\/\/cymood.com\/web\/2021\/11\/26\/51-attack\/"},"modified":"2022-11-11T14:17:31","modified_gmt":"2022-11-11T14:17:31","slug":"51-attack","status":"publish","type":"post","link":"https:\/\/cymood.com\/web\/2021\/12\/15\/51-attack\/?lang=it","title":{"rendered":"51% Attack !"},"content":{"rendered":"<p><strong>Oggi andremo a capire il significato del termine 51% attack e tutto si basa sul mining.<\/strong><\/p>\n<p>I miners di bitcoin infatti usano i loro potenti computer per tenere in vita la rete di bitcoin gestendo e processando tutte le transazioni<br \/>\nCon questo lavoro si controlla soprattutto che l&#8217;utente abbia in portafoglio i bitcoin che vuole spendere e che non si crei il fenomeno del double spending, ovvero spendere due volte lo stesso bitcoin su due o pi\u00f9 indirizzi diversi.<br \/>\nQuesto importantissimo lavoro, che garantisce il funzionamento e la fiducia in bitcoin, \u00e8 fatto controllando la blockchain nella sua interezza.<br \/>\nPer fare un esempio, nel caso di una transazione sulla blockchain di bitcoin dall&#8217; utente A a B, i miner controlleranno che la transazione sia valida, ovvero che vi siano sull\u2019indirizzo dell\u2019 utente A quei bitcoin che vuole spostare verso l\u2019indirizzo dell\u2019utente B.<br \/>\nSe la maggior parte dei miners certificheranno come corretta la transazione, allora essa sar\u00e0 confermata e verr\u00e0 iscritta sulla blockchain.<br \/>\nOra, se si avesse pi\u00f9 del 50% della potenza di calcolo della blockchain, questa teoricamente si potrebbe manipolare per i propri scopi, realizzando double spending e altri tipi di frodi come prevenire eventuali transazioni da specifici indirizzi o eliminare altri miners dalla rete.<br \/>\nil problema \u00e8 reale e fattibile sopratutto se il potere computazionale della blockchain si concentra in mano di poche mani collegate e colluse.<br \/>\nIn questo la decentralizzazione del mining dovrebbe evitare questa problematica che comunque \u00e8 sempre possibile.<br \/>\nSe pensiamo nel caso in cui la maggior parte del potere computazionale sia in mano a due o tre grosse aziende, la problematica di avere a che fare con un cartello \u00e8 possibile e probabile.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oggi andremo a capire il significato del termine 51% attack e tutto si basa sul mining. I miners di bitcoin [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":2644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86,88,91,101],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>51% Attack ! | CYMood.com<\/title>\n<meta name=\"description\" content=\"Cosa sono questi attacchi? Perch\u00e8 interessano le criptovalute? Perch\u00e8 e come possiamo proteggerci? 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