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With Bitcoin, Ethereum, and a host of other cryptocurrencies once again making headlines following an incredibly bullish year, crypto security has never been more important, this guide will teach you how to protect your cryptocurrency with a paper wallet and cold storage. 
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From
medium
It will start in your kitchen, with the humble washing machine.It’s surprisingly hard work for the advertisers to able to contact you with offers on detergent: in order to track what you’re purchasing at till, they have to engage with retailers who broker purchase data via analytics companies. Once they’ve identified your use of detergent, they leverage machine learning to place you into consumer segments, determine if you have children or not, how often you wash, if you wash items at a frequency that might indicate you play sports, etc.
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Just before last New Year’s, 19-year-old Vitalik Buterin, a Canadian college dropout and Bitcoin enthusiast, had an idea. By the end of last week, that idea had attracted more than $5 million in the first week of its pre-sale — a new kind of crowdfunding that crypto-currency makes possible. Not bad, especially considering that nobody knows whether the idea will really work. Buterin’s idea was Ethereum, a platform designed to be what Bitcoin is to money for just about everything else. Bitcoin works by spreading the currency's entire history of transactions — the blockchain, it's called — out across the whole network of its users. Rather than just recording transactions, Ethereum's blockchain would be able record and execute any program you can code. Bitcoin is a pretty interesting fish, but Ethereum is poised to be the whole ocean. Voting systems, file storage, financial instruments, all sorts of contracts — these things and more could become cheaper, faster, and more widely accessible over a distributed network. In theory, it could transform the architecture of the Internet and the infrastructure of the economy. In practice, who knows.
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Le monde de la finance s’intéresse de près à la blockchain, qui pourrait les aider à réduire certains coûts et à se passer d’intermédiaires, voire à se passer des banques elles-mêmes. Néanmoins une blockchain destinée à un milieu financier doit se démarquer d’une blockchain publique sur certains points, car les objectifs ne sont pas les mêmes.
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Un Canadien âgé de 20 ans a réuni plus de 18 millions de dollars en six semaines en vendant des ethers, une monnaie électronique qui n’existe pas encore.
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