La storia della Blockchain

La tecnologia che sostiene il mondo delle criptovalute è la famigerrima blockchain.
La blockchain permette ad ogni utente della rete di raggiungere il consenso senza doversi per forza fidare l’uno dell’altro. Mi sembra giusto raccontare qual è la storia della blockchain, in pillole.

I primi giorni

L’idea che sta alla base della tecnologia blockchain è stata descritta nell’ormai lontano 1991, quando i ricercatori Stuart Haber e W. Scott Stornetta hanno introdotto una soluzione computazionalmente pratica per marcare i documenti digitali in modo che non potessero essere retrodatati o manomessi.

Il sistema usava una catena crittograficamente sicura di blocchi per immagazzinare i documenti marcati con un timestamp e già nel 1992 il progetto venne aggiornato con gli alberi di Merkle, rendendolo più efficiente e permettendo di raccogliere più documenti in un blocco. Seppur questo dei due ricercatori fu un immenso sforzo, questa tecnologia è rimasta inutilizzata e il brevetto è scaduto nel 2004, quattro anni prima della nascita di Bitcoin.

Riutilizzabile Proof of Work

Nel 2004, l’informatico e attivista crittografico Hal Finney (Harold Thomas Finney II) ha introdotto un sistema chiamato RPoW, Reusable Proof Of Work – Riutilizzabile Proof of Work. Il sistema funzionava ricevendo un token non scambiabile o una “prova di lavoro” non fungibile basata su Hashcash e in cambio creava un token firmato RSA che poteva essere trasferito da persona a persona.

La RPoW ha risolto il problema della doppia spesa mantenendo la proprietà dei token registrati su un server affidabile, progettato per consentire agli utenti di tutto il mondo di verificare la sua correttezza e integrità in tempo reale.

Possiamo considerare RPoW come un primo prototipo e un primo passo significativo nella storia delle criptovalute.

Rete Bitcoin

Alla fine del 2008 è stata rilasciata una whitepaper, un documento di ricerca, che introduceva un sistema di denaro elettronico decentralizzato peer-to-peer – chiamato Bitcoin. Fu postato in una mailing list di crittografia da una persona o un gruppo che usava lo pseudonimo di Satoshi Nakamoto.

Questo progetto era basato sull’algoritmo Proof of work Hashcash, ma piuttosto che usare potenza hardware computazionale come l’RPoW, la protezione della doppia spesa in Bitcoin era fornita da un protocollo peer-to-peer decentralizzato per tracciare e verificare le transazioni. In parole più semplici, i Bitcoin sono “minati” per una ricompensa utilizzando il meccanismo proof-of-work dai singoli minatori e poi verificati dai nodi decentralizzati della rete.

Il 3 gennaio 2009 nasce Bitcoin.

Il primo blocco di Bitcoin è stato estratto da Satoshi Nakamoto, con una ricompensa di 50 Bitcoin. Il primo destinatario di Bitcoin fu Hal Finney, che ricevette 10 Bitcoin da Satoshi Nakamoto nella prima transazione di Bitcoin, il 12 gennaio 2009.

Rete Ethereum

Nel 2013, Vitalik Buterin, un programmatore e co-fondatore della rivista Bitcoin, ha dichiarato che Bitcoin avrebbe avuto un forte bisogno di un linguaggio di scripting (di codifica, di costruzione di codice) per costruire applicazioni decentralizzate. Non riuscendo ad ottenere il consenso della comunità, Vitalik ha iniziato lo sviluppo di una nuova piattaforma di calcolo distribuito basata su blockchain, e l’ha chiamata Ethereum. Come da lui promesso, questa nuova rete aveva al suo interno una funzionalità di scripting chiamata Smart Contracts.

Gli Smart Contracts sono programmi o script che vengono distribuiti ed eseguiti sulla blockchain di Ethereum, e possono essere utilizzati per effettuare una transazione se vengono soddisfatte determinate condizioni. Gli smart contracts o contratti intelligenti sono scritti in linguaggi di programmazione specifici e compilati in bytecode, che una macchina virtuale decentralizzata Turing-completa (o Turing-equivalente) chiamata Ethereum Virtual Machine (EVM) può poi leggere ed eseguire.

Gli sviluppatori, il cuore pulsante di questa blockchain, sono anche in grado di creare e pubblicare applicazioni che vengono eseguite all’interno della blockchain di Ethereum. Queste applicazioni sono di solito chiamate DApps (applicazioni decentralizzate) e possono avere forme molto differenti tra di loro, proprio come le app sul nostro telefono: applicazioni di social media, applicazioni di gioco d’azzardo e applicazioni per scambi finanziari.

La criptovaluta di Ethereum si chiama Ether (ETH). Può essere trasferita tra i conti e viene utilizzata per pagare le commissioni per la potenza di calcolo utilizzata durante l’esecuzione dei contratti intelligenti.

La tecnologia blockchain è sempre più al centro dell’attenzione, sta attirando molti sguardi nel mainstream ed è già utilizzata in una varietà di applicazioni, non limitate alle criptovalute.

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tenax Ortoclima Plus, Velo Protettivo per Colture 30 g/m², 2,40x10 m Bianco, Invernale, in Busta, TNT Tessuto Non Tessuto Pesante

(85)

13,82 € (a partire da 30/11/2022 21:22 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.)

Maniver Agricova Telo di protezione in tessuto non tessuto sp. 17 gr mt 1.6 x 10

(599)

3,70 € (a partire da 30/11/2022 21:22 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.)

Mini Igrometro Termometro Digitale, Termometro Ambiente con Livello di Comfort, Monitor di Temperatura e umidità, Termometro da Interno per Serra, Stanza, Casa

(2013)

8,99 € (a partire da 30/11/2022 21:22 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.)

Orphea Salvalana Foglietti Per Cassetti E Armadi, Protegge Lana E Vestiti Tutta La Stagione, Profumo Di Cedro, 12 Foglietti Emanatori

(3449)

1,69 € (a partire da 30/11/2022 21:22 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.)

Govee Termometro Igrometro, Accurato Misuratore Interna con Intelligenti avvisi App e Dati Conservazioni Sensore di Monitoraggio Digitale LCD Bluetooth per Camera Serra Garage Cantina di Vini

(1513)

18,99 € (a partire da 30/11/2022 21:22 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.)

Weber 17612 - Cubetti accendifuoco 48 pastiglie sul marrone

(9104)

4,49 € (a partire da 30/11/2022 21:22 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.)

Bosch Elettrodomestici Tfb3302V Bistecchiera Elettrica, Piastre Rimovibili E Antiaderenti, ‎Argento, 32.5 x 39 x 12 cm; 3.9 Kg

(997)

69,00 € (a partire da 30/11/2022 21:22 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.)

Maniver Agricova Telo di protezione in tessuto non tessuto sp. 17 gr mt 2.4 x 10

(847)

5,70 € (a partire da 30/11/2022 21:22 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.)

DOQAUS Igrometro Termometro Digitale, Termometro Ambiente Interno con l'Icona di Comforto, Monitor di Temperatura e Umidità, Mini Termometro Casa Interno per Ufficio, Serra,Stanza del Bambino(Nero)

(1367)

9,99 € (a partire da 30/11/2022 21:22 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.)

Flintronic Igrometro Termometro per Interni, 2 Pezzi Mini LCD Digitale Thermometer con Emoji, per Casa Monitor di Temperatura e Umidità per Ambienti, per Casa, Ufficio, Rettile, Asilo Nido

(964)

11,99 € (a partire da 30/11/2022 21:22 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.)

Yogii Tappetino per Yoga, Pilates ed Esercizio Fisico, in Gomma Termoplastica di Ottima qualità, Ecosostenibile, Antiscivolo

(583)

20,49 € (a partire da 30/11/2022 21:22 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.)

ThermoPro TP49 Mini Igrometro Termometro Digitale Termoigrometro da Interno per Casa Monitor di Temperatura e umidità per Ambienti con Livello di Comfort, Bianco

(15436)

10,49 € (a partire da 30/11/2022 21:22 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.)

BALDR Stazione Meteo Radio con sensore Esterno, termometro Digitale, igrometro Interno ed Esterno (Nero)

(2731)

36,99 € (a partire da 30/11/2022 21:22 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.)

DOQAUS Igrometro Digitale Termometro Interno, [3 Pezzi] Termometro Ambiente Interno con Livello di Comfort,Mini Termoigrometro,Accurato Monitor Temperatura e umidità per Casa, Ufficio, Serra

(2100)

20,99 € (a partire da 30/11/2022 21:22 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.)

NOKLEAD Igrometro Termometro per interni - Indicatore digitale con sensore di monitoraggio della temperatura, Portable misuratore di umidità accurato per Ambiente Stanza monitoraggio (Bianco)

(16930)

13,99 € (a partire da 30/11/2022 21:22 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.)

CULTIVEA® Kit BBQ Party pronto da coltivare - Semi 100% ecologici e biologici - Coltiva e divertiti - Idea regalo (Rosmarino, Timo, Origano, Pomodoro ciliegino, Pepe)

(2497)

16,90 € (a partire da 30/11/2022 21:22 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.)

Floranica® Rollborder | Recinzione in Legno Flessibile 203cm | Altezza: 10cm | Bianco | Impregnato | Pino | Bordatura per Prati | Palizzata | Recinto per aiuol, Giardini, frutteti, orti o sentieri

(2631)

38,90 € (a partire da 30/11/2022 21:22 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.)

MEATER Plus | Termometro Bluetooth Fino a 50 Metri a Sonda Senza Fili Per Forno, Grigliate, Barbecue. App in Italiano Compatibile con iPhone, Android, iPad e Tablet

(26136)

129,00 € (a partire da 30/11/2022 21:22 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.)

ThermoPro TP65 Termometro Igrometro Wireless per Interno Esterno Stazione Metereologica Digitale Misura umidità e Temperatura con Grande Schermo a Sfioramento e Retroilluminato

(3552)

25,99 € (a partire da 30/11/2022 21:22 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.)

SwitchBot Termometro Igrometro Ambiente - Umidità e Temperatura Interno Bluetooth per Casa, Igrometro Digitale Professionale con Allarme Intelligente e Memorizzazione dei Dati, Schermo LCD Digitale

(12918)

16,99 € (a partire da 30/11/2022 21:22 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.)

LEIVESTE-Tessuto Non Tessuto per Piante, Copri Piante Inverno,Telo Antigelo, Cappuccio TNT Antigelo 17 gr/m² (3 Cappucci - 1 x 1,6 mt)

(28)

8,19 € (a partire da 30/11/2022 21:22 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.)

PAIRIER Mini Igrometro Termometro Digitale LCD grande da,4 Pezzi Termometro Ambiente Interno per Casa, Camera da Letto, Baby Room, Ufficio, Serra, Cantina

(2530)

19,99 € (a partire da 30/11/2022 21:22 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.)

N.G.Niccolai Serre per Orto, Giardino o Terrazzo - Varie Misure - Serra con Telo Trasparente in PVC e Struttura in Metallo Verniciato (140 x 140 x h.195cm)

(648)

40,50 € (a partire da 30/11/2022 21:22 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.)

BLACK+DECKER BXGR1000E Grill Elettrico, 1000 W, Plastica, Nero

(1450)

39,90 € (a partire da 30/11/2022 21:22 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.)

amzWOW Clizia Smart Garden - Serra idroponica per Piante, Vaso Intelligente, Grow Box - Orto da Interno 100% Bio - Coltiva Le Erbe aromatiche- Timer Automatico, Luce LED Inclusa (Bianco)

(461)

69,00 € (a partire da 30/11/2022 21:22 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.)

NOKLEAD Termometro Igrometro Temperatura Umidità Monitor Sensore Interno Mini LCD Digitale Misuratore con Livello di Comfort Orologio Data Interruttore ℃/℉ 12/24Hr per Casa Calibrazione ,2 Pezzi

(121)

25,99 € (a partire da 30/11/2022 21:22 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.)

N.G.Niccolai Serre per Orto, Giardino o Terrazzo - Varie Misure - Telo Trasparente in PVC e Struttura in Metallo Verniciato (Telo Ricambio Serra NG04S01)

(648)

15,90 € (a partire da 30/11/2022 21:22 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.)

SwitchBot Igrometro Digitale Ambiente Interno - Termometro Igrometro Esterno Bluetooth per Casa, Controllo APP, Allarme Intelligente e Memorizzazione dei Dati, Facile da Usare con 3 In Schermo LCD

(3851)

16,49 € (a partire da 30/11/2022 21:22 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.)

BBQ-Toro Dutch Oven Set in scatola di legno | ghisa - già cotto | con Dutch Oven, ferro per cialde, casseruola, padella per grigliate, piastra per grigliate, griglia impilabile, sottopentola (7 pezzi)

(1373)

74,95 € (a partire da 30/11/2022 21:22 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.)

Aqara Sensore di Temperatura e Umidità, Richiede un hub Aqara, Zigbee, per il Monitoraggio Remoto e la Domotica, Igrometro Termometro Wireless, Compatibile con Apple HomeKit, Alexa, IFTTT

(2133)

21,29 € (a partire da 30/11/2022 21:22 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.)

Keter Casetta da Giardino Manor 4 x 3 Grigia in Resina 128 x 94 x 196 cm & Terry, Scaffale 3060 S-5 , Scaffale Modulare a 5 Ripiani, da Interno Esterno. Materiale: Plastica, Dimensioni: 60x30x174 cm

(6407)

374,90 € (a partire da 30/11/2022 21:22 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.)

BURNHARD Forno Pizza a Legna da Esterno, con Pala e Pietra per Pizza. Forno multicombustibile in Acciaio Inox per Pizza da Giardino, Adatto per l’Uso con Pellet, Legna, Carbone e bricchette – Nero

(1647)

279,00 € (a partire da 30/11/2022 21:22 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.)

Keter 9762000 Titan Basso XL Impermeabile, Cert. Ipx3 80 X 44 X 100 H, Grigio, 80x44x100 cm

(555)

79,90 € (a partire da 30/11/2022 21:22 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.)

Bresser Stazione Meteorologica, 38.8 x 15 x 28 Cm, Bianco

(805)

49,00 € (a partire da 30/11/2022 21:22 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.)

Mini Igrometro Termometro Digitale, Pitasha Termoigrometro Interno con Livello di Comfort, Monitor di Temperatura e umidità, Termometro da Interno per Casa, Ufficio, Serra del Termometro Ambiente (1)

(66)

6,99 € (a partire da 30/11/2022 21:22 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.)

ThermoPro TP49-3 Pezzi Mini Igrometro Termometro Digitale Termoigrometro da Interno per Casa Monitor di Temperatura e umidità per Ambienti con Livello di Comfort, Bianco

(2566)

21,99 € (a partire da 30/11/2022 21:22 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.)

Diavolina accendi griglia - 500 gr [28 accensioni naturali]

(802)

2,11 € (a partire da 30/11/2022 21:22 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.)

Keter Porta Attrezzi Da Giardino, Beige Marrone, 113,5 X 71,5 X 132 Cm

(25074)

154,90 € (a partire da 30/11/2022 21:22 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.)

NOKLEAD Igrometro Termometro per interni - Misuratore di umidità digitale per ambienti Misuratore di temperatura accurato Registrazioni max/min, Touch LCD con calibrazione orologio retroilluminato

(992)

20,99 € (a partire da 30/11/2022 21:22 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.)

Hoyiours Termometro Ambiente Interno, Igrometro Termometro con l'Icona di Conforto,Monitor di Temperatura e umidità per Ufficio, Casa, Garage,Stanza del Bambino (Bianco)

(497)

10,99 € (a partire da 30/11/2022 21:22 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.)