POS machine of digital currency

1. No, the use of digital currency does not need a POS machine at all. It only needs a mobile phone to download the digital wallet, and then it can be used normally, which is very convenient.

2. Digital currency is an alternative currency in the form of electronic currency. Both digital gold coin and password currency belong to digital currency. It can not be completely equivalent to the virtual currency in the virtual world, because it is often used for real goods and services transactions, not limited to online games and other virtual space< At present, the central bank does not recognize or issue digital currency, and digital currency does not have to have a benchmark currency. The popular digital currencies in 2015 include bitcoin, lightcoin, bitstock, etc. At present, there are thousands of digital currencies issued all over the world.

3. Coinvault virus was discovered in May 2014, infecting a large number of users in more than 100 countries around the world. In April 2015, the Dutch police received the database of decryption key from coinvault server, and then Kaspersky launched a free decryption service. However, the author of coinvault later updated the key and launched a second-generation virus, bitcryptor. Last month, two suspects were arrested by Dutch police, and the new decryption key was intercepted by the police again
similar bitcoin extortion viruses use similar methods. They use powerful encryption algorithms to encrypt the infected person's files, and then require bitcoin to pay ransom. There is a time limit, and it will not be retrieved after expiration. However, the existing technology can not crack the encryption, and there is no way except to pay ransom
however, digital currencies other than bitcoin rarely become blackmailed tools. This may be e to bitcoin's high popularity, high acceptance and global recognition. Puyin is very popular in China, but its international popularity is very limited.

4. Personally, I think this course is more comprehensive in the logical thinking ability training institutions, so I reported it to my son
I've been studying for some time now. The little guy who used to be very impulsive now has learned to sort out his ideas, make decisions after serious consideration, and often communicate with us afterwards.

5. Several colleagues in our unit have signed up for their children. In the past, they always complained that their children's homework was written at 12 o'clock at night, and their grades were always poor. They were often called by teachers in the group. Now what they talk about is what children have learned to make, what creativity they have and so on.

6. This problem I will ~ programming cats have programming courses for young children. At this stage, the children's situation is very similar, almost do not know English words, some literacy is still very weak, mainly through building blocks can easily complete the programming work. Children have their own talents and need correct guidance. Programming cat course just has such ability, can let the child be happy to learn, fall in love with learning.

7. Children are learning here now. I think it's useful for children to get in touch with programming earlier. When I signed up for children at that time, I thought that the biggest highlight of them was that there were corresponding courses for each age group. Only perfect courses could let children learn more.

8.

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