Author Topic: BestChange monitor is your exchange helper  (Read 2852 times)

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Offline BestChangeTopic starter

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Re: BestChange monitor is your exchange helper
« Reply #15 on: June 25, 2019, 01:45:32 PM »
Did you know that in its modern form, credit card appeared back in 1949? Originally nobody took them seriously, but within the next few years they literally conquered the whole world.

The first universal credit card, which could be used at a variety of establishments, was introduced by the Diners’ Club, Inc., in 1950. Another major card of this type, known as a travel and entertainment card, was established by the American Express Company in 1958.

Today billions of people around the world use bank cards. The share of cashless payments is gradually growing, and they become a usual and more convenient method of payment.

According to statistics, for the year 2015, debit card usage accounted for 69.5 billion in payments, dwarfing all other forms of non-cash payments including credit cards (33.8 billion) and checks (17.3 billion). One new debit card is issued in the U.S. every five seconds. There were 471 million Visa debit cards in the U.S. and 1.09 billion in the rest of the world at the end of March 2015.

How many bank cards do you have? How often do you use cash?



Offline BestChangeTopic starter

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Re: BestChange monitor is your exchange helper
« Reply #16 on: July 02, 2019, 08:24:19 AM »
The Amsterdam Stock Exchange is considered the oldest in the world. It was established in 1602 by the Dutch East India Company, which issued the first shares on the Amsterdam Stock Exchange. It was the first company to issue stocks and bonds and the first to formally begin trading in securities.

In the 1600's, the Dutch, French and British governments all gave charters to companies with East India in their names. At the peak of imperialism, it seemed like everyone had a share in the profits from the East Indian and Asian campaigns except the people living there. Sea trips that brought back commodities from the East were very risky - besides pirates, there were risks of weather and losing navigation.

To minimize the risk of a lost ship ruining their profits, ship owners had long been using the help of investors who would finance the trip - outfitting the ship and crew in return for a percentage of the profits if the voyage turned out a success. These early limited liability companies often lasted for only a single voyage. They were then dissolved, and a new one was created for the next trip. Investors lessened their risk by investing in several different ventures at the same time, thereby playing the odds against all of them ending in disaster.

When the East India companies formed, they changed the way business was done. These companies issued stock that would pay dividends on all the proceeds from all the voyages the companies undertook, rather than going voyage by voyage. These were the first modern joint stock companies. This allowed the companies to demand more for their shares and build larger fleets. The size of the companies, combined with royal charters forbidding competition, meant huge profits for investors.


Offline BestChangeTopic starter

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Re: BestChange monitor is your exchange helper
« Reply #17 on: July 03, 2019, 09:51:08 AM »
Is a quantum computer dangerous for Bitcoin?

Many researches say that in less than 10 years сomputing machines using quantum principles will threaten blockchain technology which is a basis for cryptocurrencies.

Bitcoin and similar systems’ defense algorithm is based on a principle of asymmetric encryption with and open and private keys. Transaction is signed by a private key, and its truth is checked with a help of an open key.

Despite the fact that Bitcoin blockchain uses asymmetric encryption, the users don’t have to worry for the safety of their coins. The open key is not stored openly. Thus, the addresses for coins transferring are not open keys, but just the results of usage of hash-function SHA-256. The hashing function performs one-sided transformation and that’s why it’s stable against quantum computer attacks.

The public key is rendered to the network in the open way just until it receives a confirmation. If an attacker receives an open key during transaction, he will have around 10 minutes to get the private key with the help of a quantum computer and try to make his own transaction from the same address but specifying a larger commission.

By the way, bitcoin mining is also relevantly safe, as the equipment for mining cryptocurrencies in the near future will be more powerful that quantum computers.

It is worth to note, that quantum calculations threaten absolutely all systems of computer security which care based on cryptography with an open key, and not only blockchain. Internet connections to render your password in Internet banking uses a similar encryption technology, same as communication in chatrooms, social networks and lots of other routine actions.

All security systems, including blockchain systems, need to take into account postquantum encryption to ensure data safety. But the most simple and effective way can be changing traditional systems by such blockchain which implements quantum-resistant cryptography.

There are several different ways of encryption with open key resistant to quantum calculations: bases on matrix, on code, multidimensional quadratic functions, and hashing function. But let us not digress into detail math stories.

The main point is that if there is a serious threat to blockchain posed by quantum computer, developers can improve the protection. Moreover, successful research and developments in this regards are being done not for the first year.

What do you think, who will be the first in this race – bitcoin developers or quantum computer developers?



Offline BestChangeTopic starter

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Re: BestChange monitor is your exchange helper
« Reply #18 on: July 17, 2019, 11:05:34 AM »
Sometimes it is necessary to confirm that you are the owner of this or that address. This may be required when, for instance, the seller wants a confirmation of your solvency, when recovering a hacked or lost account, or to prove that it was you who made a transfer and not somebody else.

Only owning a private key can prove your ownership of a bitcoin-address, but at the same time you cannot give away your private key: anybody with an access to it can spend your funds.

To solve this contradiction, a special function was developed – “signing a message”. When you sign a message, you can prove that you own a certain address and manage its funds. At the same time, secret information is not revealed, and no risk is posed for the funds at this address.

Creating a signature for any message is possible with lots of bitcoin-wallets. You will need to specify the address you need to confirm, and a message. The text can be of any nature, but it’s preferable it would tell something to the recipient. We advise you to always put the date and the reason of the message. If you sign any message without the specifics, somebody else might use it and pretend to be the owner of your address.
 
After signing the message, you can give the message with your signature to the other participant which will prove your ownership of the address. To check the signed message, it is possible to use a wallet or other resources.

Have you ever used this function? Have you heard about signing the messages for cryptocurrency wallets?


 

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