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.
Indice
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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90,00 € (a partire da 02/07/2022 19:15 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.)
Gardemia Olio di Neem per Piante 100% Vegetale Repellente Naturale Contro Afidi, Cocciniglia, Ragnetto Rosso, Zanzare, Cimici, Insetti Valido Aiuto Contro Pidocchi, Alternativa Eco Ampio Spettro 250ml
18,90 € (a partire da 02/07/2022 19:15 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.)
Chicco Dispositivo Anti-zanzare, Antizanzare Neonati, Portatile, a Ultrasuoni, Silenzioso ed Ecologico, Raggio di Efficacia 3m, Non Emette Sostanze Chimiche, con Pratica Clip, Batteria Inclusa, Bianco
14,36 € (a partire da 02/07/2022 19:15 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.)
COMPO Fazilo Pronto Uso PFnPO, Insetticida Acaricida Polivalente, 750 ml, Multicolore & Concime per Rose, Per fioriture intense e crescita rigogliosa, 1 l
9,00 € (a partire da 02/07/2022 19:15 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
109,00 € (a partire da 02/07/2022 19:15 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.)
WOLTU Telone Occhiellato Impermeabile, Telo di Copertura con Occhielli, Protezione Anti UV e Antipioggia in PE per Barca, Auto, Piscina, Bianco, 280 g/m², 2x3m
24,99 € (a partire da 02/07/2022 19:15 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.)
PROTECT HOME Cyperbase Insetticida Concentrato ad Ampio Spettro Contro Zanzare Cimici Mosche Pulci Ampio Spettro, 1 Litro & Sandokan Bio Tiger Tab Larvicida, Bianco
9,61 € (a partire da 02/07/2022 19:15 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
9,99 € (a partire da 02/07/2022 19:15 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.)
Rete Protettiva in Plastica a Maglia Quadrata per Balconi, Cancelli, Recinzioni o per Bordura, Tenax Quadra 10, Verde, 0,50 x 5 m
11,83 € (a partire da 02/07/2022 19:15 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.)
5Monkeys - Porta Zampirone Antizanzare in Metallo da Arredo Casa Giardino Esterno
12,90 € (a partire da 02/07/2022 19:15 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.)
KB Nexa Formiche Granuli, 800g & Home Difesa formiche Tubo Gel 30 & nbsp;g, Rosso, 11 & nbsp;x 2, 6 & nbsp;x 21 & nbsp;cm
13,24 € (a partire da 02/07/2022 19:15 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.)
ZIG ZAG, Insetticida Ragni, Magnatela, Ragni, Insetticida per Ragni e Ragnatele ad Alta Residualità, Previene Formazione di Ragnatele Fino a 40 Giorni, 500 ml
5,84 € (a partire da 02/07/2022 19:15 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.)
PIC Trappola Anti Tarme del Cibo - Confezione da 3 buste con due trappole = 6 pezzi – Trappola di colla per farfalline del cibo, trappole ai feromoni acchiappa tarme alimentari
9,99 € (a partire da 02/07/2022 19:15 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.)
Albagarden - Insetticida Antizanzare Giardino per Esterno E Interno Cimici Mosche Insetti Volanti Striscianti Formiche Effetto Zanzariera Anti Zanzare Casa Prati Siepi Animali No Ultrasuoni 1 Lt
29,90 € (a partire da 02/07/2022 19:15 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.)
DELTAM Giardino al PFnPO
7,80 € (a partire da 02/07/2022 19:15 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
61,99 € (a partire da 02/07/2022 19:15 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 Baule Comfy Marrone - 270 L di Capacità, In Resina, 116,7 x 44,7 x 57 cm
49,90 € (a partire da 02/07/2022 19:15 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.)
Lifewit 26 Litri Borsa Termica Borsa della Spesa Zaino Termico Porta Pranzo Borsa Frigo Isoterma per Alimenti Mantenere Caldo o Freddo per Pic-nic/all'Aperto/Barbecue/Campeggio/Eventi Sportivi/Viaggio
34,99 € (a partire da 02/07/2022 19:15 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.)
Zig Zag, Vespaio Precision, Insetticida Vespe spray ad azione immediata, con valvola a doppia erogazione, formato 400 ml
8,99 € (a partire da 02/07/2022 19:15 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.)
Compo Sana Terriccio Per Orchidee, Per Una Fioritura Ottimale, 5 L, Trasparente
6,00 € (a partire da 02/07/2022 19:15 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.)
Autan Antitarme Alimentari, Confezione da 2 Fogli, Cattura le Tarme Alimentari e le Farfalline del Cibo, Efficace fino a 8 Settimane
3,99 € (a partire da 02/07/2022 19:15 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.)
protect home FORMINIX Esca FORMICHE GRANULARE. ELIMINA Il Nido RISOLVENDO Il Problema 200g, Granulo Rosa
8,50 € (a partire da 02/07/2022 19:15 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.)
Erba Sintetica drenante 7mm 50 Misure Disponibili in Altezza 1 Metro o 2 Metri Prato Sintetico Alta qualità 100% Made in Italy (1x1 Metro)
13,99 € (a partire da 02/07/2022 19:15 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 dell'aria
13,99 € (a partire da 02/07/2022 19:15 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.)
Scacciamosche elettrico ecologico Innoliving INN-194
6,39 € (a partire da 02/07/2022 19:15 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.)
Raid Esca Formiche Insetticida, Pronta all'Uso in Spazi Interni ed Esterni, Confezione da 1 pezzo
2,99 € (a partire da 02/07/2022 19:15 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.)
CIPEX 10E INSETTICIDA ADULTICIDA LIQUIDO A BASE DI CIPERMETRINA lt.1 INSETTI VOLANTI E STRISCIANTI ZANZARE
24,16 € (a partire da 02/07/2022 19:15 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.)
CONOPU Racchetta Zanzare Elettrica, 4000 Volt, 1200mAh USB Ricaricabile Antizanzare, Torcia Rimovibile, 3 Strati Protezione Maglia, Efficace Contro Le Mosche, Ideale per Interni ed Esterni, Nero
19,99 € (a partire da 02/07/2022 19:15 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.)
KedBrok Antizanzare Ultrasuoni 2022 Aggiornato, Ultrasuoni per Topi Elettrico Repellente ad Ultrasuoni Dissuasore Anti Zanzare, Topi, Insetti, Formica, Roach, Ratti, Flea, Ragni, 4 Pack
37,99 € (a partire da 02/07/2022 19:15 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.)
besrey Zaino Termico 30 Litri Termica Borsa，Zaino Isotermico，Porta Pranzo Mantenere Alimenti Caldi o Freddi. per Campeggio, Picnic, Barbecue, Eventi (Nero)
47,99 € (a partire da 02/07/2022 19:15 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.)
STI Bordi per Prato in Mattonelle 6 Pezzi + 2 Angoli
4,90 € (a partire da 02/07/2022 19:15 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 Scarafaggi, Estirpa la Colonia ed Elimina l'Infestazione, Efficace Anche Contro Le Blatte, confezione da 6 Pezzi, Esca Bianca
5,41 € (a partire da 02/07/2022 19:15 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.)
0.5 L Diserbante Premium Top Totale Erbicida Glifosate No Patentino Sistemico Seccatutto Post Emergenza
12,90 € (a partire da 02/07/2022 19:15 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.)
COMPO Tripla Azione PFnPO, Insetticida-Fungicida-Acaricida pronto all'uso, Per Piante Ornamentali e da Fiore di tipo arbustivo ed erbaceo, 750 ml
11,40 € (a partire da 02/07/2022 19:15 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.)
Gardemia Olio di Neem per Piante Spray 750ml Pronto Uso Repellente Naturale Contro Afidi Cocciniglia Ragnetto Rosso Zanzare Cimici Insetti, Valido Aiuto Contro Pidocchi, Alternativa Eco Ampio Spettro
17,90 € (a partire da 02/07/2022 19:15 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.)
Zig Zag Insetticida per Nidi di Vespe e Calabroni, 600ml
9,99 € (a partire da 02/07/2022 19:15 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.)
Veleno per Topi e Ratti, Esca Topicida Ratticida Professionale Potente, Novità Aroma all'Anice, Uso Esterno Interno Casa, Disinfestazione Rimedi Eliminare Roditori Azione Forte BlockRat - 300 g
13,99 € (a partire da 02/07/2022 19:15 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.)
Naramaki® Insetticida Vape Antiformiche - 2 Confezioni da 2 Esche
6,38 € (a partire da 02/07/2022 19:15 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.)
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