Immutabilità significa impossibilità di cambiare. In informatica, un oggetto immutabile è un oggetto il cui stato non può essere alterato dopo la sua creazione.
L’immutabilità è una delle caratteristiche chiave di Bitcoin e della tecnologia blockchain. Le transazioni immutabili rendono impossibile a qualsiasi entità (per esempio, un governo o una società) di manipolare, sostituire o falsificare i dati memorizzati sulla rete.
Poiché tutte le transazioni storiche possono essere verificate in qualsiasi momento, l’immutabilità permette un alto grado di integrità dei dati.
L’immutabilità delle blockchain pubbliche può migliorare l’attuale sistema di fiducia e di controllo, e può ridurre il tempo e il costo delle revisioni poiché la verifica delle informazioni diventa molto più semplice o effettivamente ridondante.
L’immutabilità può anche aumentare l’efficienza complessiva di molte aziende fornendo loro l’opportunità di mantenere un record storico completo dei loro processi aziendali. L’immutabilità può anche fornire chiarezza a molte controversie aziendali, in quanto consente una fonte di verità verificabile e condivisa.
Mentre l’immutabilità è uno dei benefici principali di Bitcoin e della tecnologia blockchain, i dati memorizzati sulle blockchain non sono completamente resistenti alle vulnerabilità: se un attore malintenzionato fosse in grado di accumulare la maggioranza del tasso di hash della rete – hashrate, potrebbe alterare i dati altrimenti immutabili in un attacco che è stato chiamato Attacco del 51%.
In un tale scenario colui che detiene il 51% dell’hashrate potrebbe di impedire alle nuove transazioni di ottenere conferme o addirittura di invertire completamente le transazioni. Può accadere anche a Bitcoin? Sì, ma richiede una potenza di hashing mostruosa, hardware costosissimo e notevoli quantità di elettricità.
D’altra parte, le reti Proof of Work con tassi di hash più bassi sono vulnerabili a un tale attacco, poiché raccogliere la quantità necessaria di potenza di hashing per attaccare la rete non è un’impresa così irragionevole.
Fire TV Stick Lite con telecomando vocale Alexa | Lite (senza comandi per la TV), Streaming in HD
34,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)TP-Link Telecamera Wi-Fi Interno 3MP, Videocamera sorveglianza, Visione Notturna, Notifiche in Tempo Reale, Storage su Cloud e MicroSD fino a 256GB, Funziona con Alexa e Google Assistant(Tapo C210)
39,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Apple 2021 AirPods (terza generazione) con custodia di ricarica MagSafe
189,00 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Samsung Galaxy A33 5G Smartphone Android, Display Infinity-U FHD+ Super AMOLED 6.4”¹, 6GB RAM e 128GB di memoria interna espandibile², Batteria 5.000 mAh, Awesome Black [Versione Italiana]
252,89 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)HP 302 Nero, F6U66AE, Cartuccia Originale HP da 190 pagine, Compatibile con Stampanti HP DeskJet 1110, 2130 e 3630, HP OfficeJet 3830 e 4650
16,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Xiaomi Redmi Note 11 - Smartphone 4+128GB, Display AMOLED FHD+ 6.43” 90Hz, Snapdragon 680, quadrupla fotocamera 50MP, 5000mAh, Graphite Grey (IT + 2 anni garanzia) Alexa mani libere
171,90 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Imou Telecamera Wi-Fi Interno, 1080P Videocamera di Sorveglianza, Tracciamento del Movimento con Sirena, Telecamera WiFi con Rilevamento Umano, Audio Bidirezionale, Funziona con Alexa, 2,4G, Ranger 2C
27,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Chromecast con Google TV (HD) Bianco Ghiaccio - Intrattenimento in streaming sulla TV con telecomando e ricerca vocale - Guarda film, Netflix, DAZN e molto altro- Facile da installare
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119,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)HP 304 Tricromia, N9K05AE, cartuccia originale HP, compatibile con stampanti HP DeskJet 2620, 2630, 3720, 3730, 3750 e 3760, HP ENVY 5010, 5020 e 5030
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49,90 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)HP 305 Nero, 3YM61AE, cartuccia originale HP, compatibile con stampanti HP DeskJet seri 2700, 4100, HP ENVY serie 6020, 6030, 6420, e 6430
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191,00 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Duracell - Plus AAA, Batterie Ministilo Alcaline, Confezione da 12, 1.5 volt LR03 MN2400
8,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)HP 305 Tricromia, 3YM60AE, cartuccia originale HP, compatibile con stampanti HP DeskJet seri 2700, 4100, HP ENVY serie 6020, 6030, 6420, e 6430
10,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)A3A ACADGQ Tavolino da Letto, Tavolo Laptop Pieghevole con 4 Interfaccia USB, Cassetto, Slot per Tazza, Staffa Pad, Adatto per Letto, Divano, Pavimento (60x40cm, Colore del Legno)
40,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Epson Expression Home XP-2200 Stampante Multifunzione A4 a Getto d'inchiostro (Stampa Fronte Retro, Scansione, Copia) Wi-Fi Direct, Compatibile Cartucce Serie 604 Ananas, Stampa da Mobile e su Cloud
45,02 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Apple AirTag in confezione da 4
112,57 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Fujifilm 16386016 Instax Mini Film Pellicola Istantanea per Fotocamere Instax Mini, Formato 46x62 mm, Confezione da 20 Foto
14,99 € (a partire da 20/03/2023 20:59 GMT +00:00 - Altre informazioniProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Benvenuto nella sezione "Giardino e Giardinaggio"! Cazoo, che gran prodotti!
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