{"id":3985,"date":"2020-08-30T04:28:18","date_gmt":"2020-08-30T01:28:18","guid":{"rendered":"https:\/\/alfacash.blog\/?p=3985"},"modified":"2024-02-19T21:53:20","modified_gmt":"2024-02-19T18:53:20","slug":"manichini-cose-blockchain-come-funziona","status":"publish","type":"post","link":"https:\/\/alfacash.blog\/it\/2020\/08\/30\/manichini-cose-blockchain-come-funziona\/","title":{"rendered":"Per i manichini: cos&#039;\u00e8 una blockchain e come funziona?"},"content":{"rendered":"<p>Blockchain e ancora blockchain! Questo \u00e8 attualmente un termine comune, quasi una moda passeggera nelle sfere aziendali. Tutti vogliono qualcosa con blockchain, anche se non sanno esattamente cosa sia una &quot;blockchain&quot;. Qualcosa sulle criptovalute, giusto? Qualcosa come un nuovo super-techy-thingamajig, giusto ...?<\/p>\n\n\n\n<p>Non esattamente, amico mio. Quindi, possiamo iniziare a dire cosa NON \u00e8 una blockchain e a cosa NON serve:<\/p>\n\n\n\n<p><strong>* Blockchain non \u00e8 una criptovaluta.<br>* Blockchain non \u00e8 una piattaforma di investimento.<br>* Blockchain non \u00e8 la piattaforma open source pi\u00f9 grande.<br>* Blockchain potrebbe non essere un sistema distribuito.<br>* Blockchain potrebbe non essere un file <em>decentralizzato<\/em> sistema.<br>* Blockchain non \u00e8 magico.<br>* Blockchain non pu\u00f2 risolvere tutti i tuoi problemi.<br>* Blockchain potrebbe non aumentare i tuoi guadagni in alcun modo.<br>&nbsp;<\/strong><\/p>\n\n\n\n<p>Tutto chiaro? Quindi possiamo iniziare <a href=\"https:\/\/alfacash.blog\/2020\/08\/19\/good-news-read-learn-ask-new-blog-crypto\/\">imparare<\/a> cos&#039;\u00e8 realmente una &quot;blockchain&quot; e qual \u00e8 il suo scopo nell&#039;universo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Una blockchain \u00e8 ...<\/strong><\/h2>\n\n\n\n<p><strong>Questa cosa non \u00e8 altro che un libro mastro contabile in una versione crittografata digitale.<\/strong> Sembra noioso? Beh, \u00e8 un po &#039;noioso, ad essere onesti. Dov&#039;\u00e8 la magia l\u00ec dentro? Perch\u00e9 tutti sono cos\u00ec eccitati? E perch\u00e9 questa cosa ha qualcosa a che fare <a href=\"https:\/\/alfacash.blog\/2020\/08\/18\/what-is-cryptocurrency-why-should-care-reasons\/\">con le criptovalute?<\/a> Lasciateci spiegare.<\/p>\n\n\n\n<p>Dodici anni fa, la persona (o il gruppo di persone) noto come Satoshi Nakamoto stava cercando di risolvere il problema della doppia spesa in denaro digitale in modo affidabile. Ok! Possiamo rallentare un po &#039;. La doppia spesa \u00e8, fondamentalmente, spendere lo stesso denaro digitale pi\u00f9 di una volta (come dovrebbe essere). Sai, puoi copiare e incollare quasi tutto su Internet, perch\u00e9 non i soldi?<\/p>\n\n\n\n<p>Per evitare questo tipo di comportamento, ci siamo fidati di istituzioni centralizzate, come banche e governi. Una volta inviato un bonifico bancario elettronico, il sistema della banca sconta il denaro dal tuo conto. Se non ci fossero, probabilmente le persone spenderebbero gli stessi soldi pi\u00f9 volte. E che \u00e8 come una rapina.<\/p>\n\n\n\n<p>Cos\u00ec, <strong>Satoshi stava pensando in un sistema automatico per sostituire queste istituzioni centralizzate <\/strong>e rendere possibile avere contante digitale senza il problema della doppia spesa allo stesso tempo. Afferr\u00f2 quindi una sorta di database crittografico sperimentale (crittografato) creato negli anni &#039;70 e lo mischi\u00f2 con altri elementi tecnologici per creare la prima valuta digitale decentralizzata senza un problema di doppia spesa. E Bitcoin \u00e8 nato nel 2009!<\/p>\n\n\n\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-1024x681.jpg\" alt=\"\" class=\"wp-image-3989\" srcset=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-1024x681.jpg 1024w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-300x199.jpg 300w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-150x100.jpg 150w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-18x12.jpg 18w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-270x180.jpg 270w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-770x512.jpg 770w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-764x508.jpg 764w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-775x515.jpg 775w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-370x246.jpg 370w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-554x368.jpg 554w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-306x203.jpg 306w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-260x173.jpg 260w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280-87x58.jpg 87w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-2643159_1280.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Immagine di Gerd Altmann \/ Pixabay<\/figcaption><\/figure><\/div>\n\n\n\n<p>Questo database crittografico sperimentale \u00e8 la famosa blockchain, nonostante nessuno lo sapesse come allora. Nemmeno Satoshi: il nome \u00e8 venuto <a href=\"https:\/\/alfacash.blog\/2020\/08\/22\/bitcoin-to-the-moon-5-predictions-for-2021-and-beyond\/\">dopo Bitcoin<\/a>. Perch\u00e9 non &quot;crypto-database&quot; o qualcosa di simile, invece di &quot;blockchain&quot;? Beh, \u00e8 perch\u00e9 il database \u00e8 in realt\u00e0 ... una catena di blocchi, come sembra. Blocchi digitali.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Come funzionano i blocchi?<\/strong><\/h2>\n\n\n\n<p><strong>Ogni &quot;blocco&quot; \u00e8 un piccolo contenitore di dati<\/strong> (transazioni monetarie, in un caso di criptovaluta), incatenato a tutti gli altri (passati e futuri) con qualcosa chiamato &quot;hash&quot;. Questi sono il risultato crittografato del passaggio dei dati attraverso un algoritmo complesso. Qualcosa di simile (se usiamo il file <a href=\"https:\/\/passwordsgenerator.net\/sha256-hash-generator\/\">Algoritmo SHA256<\/a>):<\/p>\n\n\n\n<p>* Dati iniziali: hai trasferito 1 BTC a Mike.<br>* Dati con hash: 710DAEB54021CCD83046E4FA16106E4DC10E5D617E4C28F61CE29C29CFAE823E<\/p>\n\n\n\n<p>Ogni hash rappresenta un&#039;identit\u00e0 univoca per ogni transazione e ogni blocco (un gruppo di transazioni) esistente. Tutte queste identit\u00e0 si fondono matematicamente in seguito l&#039;una con l&#039;altra, &quot;incatenandosi&quot; in quel modo. Quindi, se qualcuno cerca di imbrogliare, l&#039;hash della propria transazione (l&#039;identit\u00e0 univoca) cambier\u00e0; e se cambia, verr\u00e0 sbloccato e non sar\u00e0 pi\u00f9 valido automaticamente.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-1024x682.jpg\" alt=\"\" class=\"wp-image-3991\" srcset=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-1024x682.jpg 1024w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-300x200.jpg 300w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-150x100.jpg 150w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-18x12.jpg 18w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-270x180.jpg 270w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-770x513.jpg 770w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-762x508.jpg 762w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-773x515.jpg 773w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-370x247.jpg 370w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-554x369.jpg 554w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-306x204.jpg 306w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-368x245.jpg 368w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-260x173.jpg 260w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280-87x58.jpg 87w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/dominoes-1902622_1280.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Foto di Christine Schmidt \/ Pixabay<\/figcaption><\/figure><\/div>\n\n\n\n<p>Ad esempio, ricordiamo i nostri dati iniziali (hai trasferito 1 BTC a Mike). Se cambiamo anche un po &#039;di carattere l\u00ec dentro, anche l&#039;hash cambier\u00e0 radicalmente:<\/p>\n\n\n\n<p>* Dati iniziali: hai trasferito 2 BTC a Mike.<br>* Dati con hash: 005002AC29AE0D1944110DB27CC73E9090F013B15207D84F2086B8646DAF549E<\/p>\n\n\n\n<p>La transazione non \u00e8 pi\u00f9 valida e tu, povero mortale, non puoi ingannare il sistema blockchain. Anche se le autorit\u00e0 non stanno controllando. Ma ora, simuliamo la &quot;fusione&quot; tra le transazioni. Diciamo che quegli hash sono effettivamente entrambi validi e rappresentano le identit\u00e0 di due blocchi diversi. <strong>Come si incatenano l&#039;un l&#039;altro? Combattendo se stessi insieme, ovviamente.<\/strong> Come questo:<\/p>\n\n\n\n<p>*Dati iniziali:<br>710DAEB54021CCD83046E4FA16106E4DC10E5D617E4C28F61CE29C29CFAE823E<br>005002AC29AE0D1944110DB27CC73E9090F013B15207D84F2086B8646DAF549E<br>* Dati con hash: EDFE12B5DB008F6491BA671DBE6BA25BD89BD6445B5003E9B3789605DBD24AD8<\/p>\n\n\n\n<p>E questo \u00e8 tutto! Se vuoi cambiare qualcosa e renderlo valido, devi prima decifrare e modificare ogni blocco esistente. Buona fortuna con esso.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Una blockchain non funziona da sola<\/strong><\/h2>\n\n\n\n<p>Nonostante la matematica, quel sofisticato libro mastro non pu\u00f2 funzionare da solo. Ha bisogno degli altri elementi che Satoshi ha aggiunto: una rete distribuita di nodi (e persone), il suddetto algoritmo per crittografare le transazioni e impostare le regole per i validatori, le transazioni da spendere o &quot;monete&quot; e chiavi crittografiche private e pubbliche. Controlliamo rapidamente uno per uno.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Rete distribuita<\/strong> <\/h3>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-1024x682.jpg\" alt=\"\" class=\"wp-image-3990\" srcset=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-1024x682.jpg 1024w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-300x200.jpg 300w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-150x100.jpg 150w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-18x12.jpg 18w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-270x180.jpg 270w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-770x513.jpg 770w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-762x508.jpg 762w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-773x515.jpg 773w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-370x247.jpg 370w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-554x369.jpg 554w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-306x204.jpg 306w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-368x245.jpg 368w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-260x173.jpg 260w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280-87x58.jpg 87w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/smartphone-3947607_1280.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption><em>Immagine di Gerd Altmann \/ Pixabay <\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p>Non sono le banche o i governi, ma qualcuno dovrebbe verificare le transazioni in qualche modo. E, per i sistemi decentralizzati (come la maggior parte delle criptovalute), sarebbe una rete distribuita conformata da molte persone in tutto il mondo e dai loro computer e apparecchiature (nodi). Soprattutto gli ultimi.<\/p>\n\n\n\n<p>La cosa \u00e8, <strong>ogni membro della rete (noto come <a href=\"https:\/\/alfacash.blog\/2020\/08\/25\/cryptocurrency-mining-dummies-how-works\/\">minatore o validatore<\/a>) ha una copia dell&#039;intera blockchain nel proprio hardware<\/strong>, e il loro software specializzato o attrezzatura mineraria \u00e8 incaricato di verificare e conservare il registro di ogni nuova transazione e coniare nuove &quot;monete&quot;; seguendo le regole matematiche stabilite dall&#039;algoritmo del sistema. Il risultato dovrebbe essere sempre lo stesso per la maggior parte dei validatori, altrimenti la transazione o il blocco non saranno validi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Un algoritmo di consenso <\/strong><\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-1024x768.jpg\" alt=\"\" class=\"wp-image-3992\" srcset=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-1024x768.jpg 1024w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-300x225.jpg 300w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-150x113.jpg 150w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-16x12.jpg 16w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-240x180.jpg 240w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-687x515.jpg 687w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-677x508.jpg 677w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-370x278.jpg 370w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-554x416.jpg 554w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-306x230.jpg 306w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-327x245.jpg 327w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-260x195.jpg 260w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280-87x65.jpg 87w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/enigma-441280_1280.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Immagine di Tomasz Miko\u0142ajczyk \/ Pixabay<\/figcaption><\/figure><\/div>\n\n\n\n<p>Possiamo definire un algoritmo come un insieme di passaggi e metodi che vengono costruiti \u2014con la matematica\u2014 per ottenere un risultato specifico o risolvere un problema. Ci sono molti algoritmi l\u00e0 fuori e non tutti funzionano per costruire una blockchain. Dovrebbero essere molto complessi e forti, al fine di mantenere un&#039;elevata sicurezza e forzare le regole tra i validatori.<\/p>\n\n\n\n<p><strong>Non tutte le criptovalute o sistemi blockchain utilizzano lo stesso algoritmo.<\/strong> <a href=\"https:\/\/alfacash.blog\/2020\/08\/20\/how-buy-bitcoin-simple-steps-nice-recipe\/\">Bitcoin, ad esempio<\/a>, usa SHA256 (quello che abbiamo usato prima), ma Ethereum usa Ethash e Zcash usa Equihash. Sono funzioni matematiche diverse, ma lo scopo \u00e8 lo stesso: crittografare i dati. &nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Output di transazione non spesi (UTXO) <\/strong><\/h3>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-1024x682.jpg\" alt=\"\" class=\"wp-image-3993\" srcset=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-1024x682.jpg 1024w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-300x200.jpg 300w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-150x100.jpg 150w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-18x12.jpg 18w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-270x180.jpg 270w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-770x513.jpg 770w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-762x508.jpg 762w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-773x515.jpg 773w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-370x247.jpg 370w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-554x369.jpg 554w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-306x204.jpg 306w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-368x245.jpg 368w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-260x173.jpg 260w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280-87x58.jpg 87w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/bitcoin-4338837_1280.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Immagine di Matthias Wewering \/ Pixabay <\/figcaption><\/figure><\/div>\n\n\n\n<p>Sappiamo che il termine sembra difficile, ma queste sono le &quot;monete digitali&quot; o le transazioni in s\u00e9. Sono come frammenti di propriet\u00e0 che lavorano per lo scambio con altre persone. Puoi anche confrontarli con le banconote oi centesimi all&#039;interno del tuo portafoglio fisico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Chiavi crittografiche private e pubbliche<\/strong><\/h3>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain.jpg\" alt=\"\" class=\"wp-image-3994\" srcset=\"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain.jpg 1000w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-300x200.jpg 300w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-150x100.jpg 150w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-18x12.jpg 18w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-270x180.jpg 270w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-770x515.jpg 770w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-762x508.jpg 762w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-772x515.jpg 772w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-370x247.jpg 370w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-554x370.jpg 554w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-306x204.jpg 306w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-367x245.jpg 367w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-260x173.jpg 260w, https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/Private-and-public-keys-blockchain-87x58.jpg 87w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption>Immagine di IntelFreePress \/ Flickr<\/figcaption><\/figure><\/div>\n\n\n\n<p>Queste sono chiavi matematiche che funzionano come indirizzi per inviare e ricevere fondi all&#039;interno di una blockchain. <strong>La chiave pubblica \u00e8 come un numero di conto bancario:<\/strong> puoi condividerlo liberamente per ricevere denaro. La chiave privata, invece, lavora per \u201cfirmare\u201d le transazioni e verificare il vero proprietario e la sua intenzione di inviare i fondi. In altre parole, una chiave privata \u00e8 come una password ed entrambe, la chiave privata e quella pubblica, formano un &quot;account&quot; all&#039;interno della criptovaluta o della blockchain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><br><strong>&quot;Blockchain&quot; non significa sempre &quot;decentralizzato&quot;<\/strong><\/h2>\n\n\n\n<p>Come abbiamo detto all&#039;inizio, una blockchain potrebbe non essere distribuita e potrebbe non essere decentralizzata. Dopotutto, \u00e8 solo un libro mastro crittografico e gli altri elementi che funzionano con esso possono cambiare in base alle esigenze dei loro creatori.<\/p>\n\n\n\n<p>Satoshi Nakamoto \u00e8 stata la prima persona a usarlo con Bitcoin, ma <a href=\"https:\/\/github.com\/bitcoin\/bitcoin\">il codice sorgente<\/a> per questo tipo di libro mastro \u00e8 aperto al pubblico. Pu\u00f2 essere copiato, incollato, modificato e persino venduto. Quindi, molte persone (e aziende) in tutto il mondo hanno provato questa tecnologia per i propri usi, anche al di l\u00e0 delle criptovalute. Le banche non sono escluse: a loro piace usare blockchain per costruire nuove piattaforme di pagamento. E, come puoi immaginare, non sono decentralizzati, ma totalmente controllati dalla rete istituzionale.<\/p>\n\n\n\n<p><strong>A volte, le blockchain non funzionano con reti distribuite, ma solo con reti interne controllate<\/strong>. Questo tipo di piattaforma richiede le autorizzazioni utente dei creatori, quindi vengono chiamate blockchain &quot;autorizzate&quot; o private. Dall&#039;altro lato, le criptovalute e piattaforme come Bitcoin funzionano con reti decentralizzate. Questo li rende &quot;senza autorizzazione&quot; o pubblici.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p class=\"has-text-align-center\"><em>Vuoi scambiare BTC, ETH e altri token? Puoi farlo<\/em>\u00a0<em>in modo sicuro\u00a0<a href=\"https:\/\/www.alfa.cash\/buy\/bitcoin\" target=\"_blank\" rel=\"noreferrer noopener\">su Alfacash<\/a>! E non dimenticare che stiamo parlando di questo e di molte altre cose sui nostri social media.<br><br><\/em><a href=\"https:\/\/twitter.com\/alfacash_crypto\" target=\"_blank\" rel=\"noreferrer noopener\">Twitter<\/a>\u00a0*\u00a0<a href=\"https:\/\/t.me\/AlfacashCommunity\" target=\"_blank\" rel=\"noreferrer noopener\">Telegramma<\/a>\u00a0*\u00a0<a href=\"https:\/\/www.instagram.com\/alfacashstore\" target=\"_blank\" rel=\"noreferrer noopener\">Instagram<\/a> * <a href=\"https:\/\/www.youtube.com\/channel\/UCOl4fdRHj8AseQ5b6z9udaw\" target=\"_blank\" rel=\"noreferrer noopener\">Youtube<\/a>\u00a0*<a href=\"https:\/\/www.facebook.com\/alfacashstore\" target=\"_blank\" rel=\"noreferrer noopener\">Facebook<\/a>\u00a0\u00a0*\u00a0<a href=\"https:\/\/vk.com\/alfacashcrypto\" target=\"_blank\" rel=\"noreferrer noopener\">Vkontakte<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Tutti vogliono qualcosa con blockchain, anche se non sanno esattamente cosa sia una &quot;blockchain&quot;. Quindi, scopriamolo!<\/p>","protected":false},"author":5,"featured_media":3747,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[48],"tags":[43,86,44,56,87,72],"class_list":{"0":"post-3985","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-learn","8":"tag-bitcoin","9":"tag-blockchain","10":"tag-decentralization","11":"tag-how-to","12":"tag-ledger","13":"tag-mining"},"featured_image_src":"https:\/\/alfacash.blog\/wp-content\/uploads\/2020\/08\/What-is-a-blockchain-deep-inside.svg","author_info":{"display_name":"Isabel P\u00e9rez","author_link":"https:\/\/alfacash.blog\/it\/author\/isabel\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v25.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>For dummies: what is a blockchain and how it works? - alfa.cash blog<\/title>\n<meta name=\"description\" content=\"Everybody wants something with blockchain, even if they don\u2019t know exactly what a \u201cblockchain\u201d is. 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