One thing that few people knows is that asymmetric cryptography, which is the basis of Cryptocurrencies purses, basically serves to digitally sign transactions, so that they can only be authorized by the owner of the purse.
Another thing that few knows is that the Opera browser was purchased by the largest operator in the Cryptocurrencies mining field, who have announced that soon could integrate within the same browser a purse for Cryptocurrencies.
In short, we can have available to download and use a browser with an integrated wallet. For that moment, if you want, the browser can use the integrated purse not only to sign digitally (and therefore authorize) the shipping Cryptocurrencies transactions, but also to digitally sign many other things. How to log in to Web sites
If we reach this level, we will no longer need passwords to access a website, because access to your private area can be done simply thanks to the digital signature of the purse. Surely, we'll need a password to access, but it'll be just once.
Therefore, it will suffice a single password that will give access to the wallet integrated in the browser to access all the sites that provides the login through the digital signature of the same wallet.
However, although the next version of Opera with the built-in purse may be available in a few weeks, or a month at most, it can take years to have websites that allows for the digital signature of the purse.
In fact, in theory they could never appear, but when the use of browsers with integrated purse extends, it is likely that someone will choose to offer this simple and immediate access mode to attract users with a very simplified user experience ( Especially with respect to e-commerce sites).
Then, if on one hand the browsers with integrated purse are almost the same, on the other hand, it is likely that its inevitably diffusion leads to the substitution of passwords with digital signatures of purses as a form of access to many Web sites, starting by e-commerce.
At this point, we can even imagine linking payments on websites to the same purse in a second.
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