How to save virtual currency

1. Virtual currency is also called digital currency. The underlying technology is blockchain. It depends on the network and ensures its existence and security through mathematics, cryptography and other means.

2. bitcoin uses a number of technologies, more than one, mainly distributed P2P technology, cryptography technology and so on
it is recommended to search bitcoin white paper for more information.

3. In fact, the information of the chain also needs to be reconfirmed. The network structure based on block + chain will become an information that can not be tampered with and can be traced all the way down. But the initial information on the chain, is to do authentication or confirm the right.

4. According to the security level, the top is the most secure:
1, offline wallet
2, paper wallet
3, super long keyword brain wallet

5.

How to keep coins:

coins are kept in special plastic boxes, which have certain sealing and isolation functions on the one hand, and transparent materials on the other hand, which are also easy to watch. However, it should be noted that the selection of materials containing PVC should be avoided. PVC will precipitate plasticizer at room temperature to corrode coins. The whole roll can be filled in a special coin barrel

in addition, if you need to hold coins for viewing, you should not touch the surface of coins directly with bare hands. You can hold the side teeth of coins for viewing. If possible, you'd better wear gloves or fingertips

banknote storage method:

first, make sure that the banknote is dry enough. If the paper currency is exposed to air for a long time, it is easy to inhale a lot of moisture. If it is bought, it will be covered with a plastic protective bag immediately, and the moisture will not come out. It is easy to get moldy after a period of time

so you must not be lazy after taking it back. The simplest way to dry is: in autumn, many areas in China are relatively dry, so you can expose the paper money to the air for a period of time, and then it can reach the standard of drying. The length of drying time depends on the air humidity at that time. The drier the environment is, the shorter the drying time is. It is usually less than 50% humidity for a few minutes

the common notebook computer can be used to dry the banknotes, and the specific method is: put the banknotes horizontally at a distance of 2-3cm from the heat sink of the notebook computer for a while to complete the drying process. Pay attention to the best not to use hair dryer, because the wind is too strong and the temperature is too high, are easy to cause damage to the notes

Like other banknotes, aerospace banknotes need to be protected from moisture and direct sunlight ring long-term storage. The simplest way is to put a protective bag (special plastic bag or paper money protection bag) on each note after drying, or store the whole knife in a paper collection bag

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extended materials :

coins worthy of collection:

the first set: there are 62 editions to be called the most

the first set of RMB has been issued since December 1, 1948, with a total of 12 denominations and 62 editions, including 2 yuan vouchers, 4 yuan vouchers, 4 yuan vouchers, 7 yuan vouchers, 7 yuan vouchers, 10 yuan vouchers, 5 yuan vouchers, 6 yuan vouchers There are 6 kinds of 1000 yuan coupons, 5 kinds of 5000 yuan coupons, 4 kinds of 10000 yuan coupons and 2 kinds of 50000 yuan coupons

the second set: Penny coins were issued

on March 1, 1955, the second set of RMB was issued, including 10 kinds, including 1 Fen, 2 fen, 5 fen, 1 jiao, 2 jiao, 5 jiao, 1 yuan, 2 yuan, 3 yuan and 5 yuan, and another 10 yuan was issued on December 1, 1957. At the same time, in order to facilitate circulation, the State Council issued an order to issue one cent, two cent and five cent coins from December 1, 1957, equivalent to paper cents

Later, the patterns and patterns of the 1 yuan note and the 5 yuan note were adjusted and changed, and the black 1 yuan note and the brown 5 yuan note were issued on March 25, 1961 and April 20, 1962, respectively, which increased the editions of the second set of RMB from 11 to 16

the third set: cancel the 3-yuan note and add 10 cents, 2 cents, 5 cents and 1-yuan coins

the third set of RMB was issued on April 20, 1962. On the basis of the second set of RMB, the third set of RMB has completely adjusted and replaced its edition. The 3-yuan note in the second set of RMB has been cancelled, and four kinds of metal notes, i.e. 1 jiao, 2 jiao, 5 jiao and 1 yuan, have been added. After 18 years of graal adjustment and replacement of the third set of RMB, a total of 10 kinds of the second set of RMB (except 6 kinds of paper and hard currency) have been recovered

the third set of 13 kinds of RMB were issued in succession, including 1 kind of 10 yuan note, 1 kind of 5 yuan note, 1 kind of 2 yuan note, 1 kind of 1 yuan note, 1 kind of 5 jiao note, 1 kind of 2 jiao note, 3 kinds of 1 jiao note, 1 kind of 1 yuan coin, 1 kind of 5 jiao coin, 1 kind of 2 jiao coin and 1 kind of 1 jiao coin< br />

6. Don't touch the front and back of the coin with your hands; Use a special coin clip and paper money protective film to pack the coins and put them into the coin collection book. Do not soak the coins in alcohol. If the coins are stained, soak them in vinegar and rinse them with water.

7. The opening time of the aquarium is 8:30,
the closing time from October to February is 18:30 (no admission after 17:30)
December is a time when there are more people, so the closing time is extended to 19:30 (no admission after 18:30)

summer (March to September) is the peak tourist season of Okinawa, The closing time will be extended to 20:00 (admission is not allowed after 19:00)
in addition, the aquarium will be closed on the first Wednesday and Thursday in December every year

you can take a bus or taxi to the aquarium. If the number of people is large, in fact, the cost performance of car chartering will be higher. Apart from the aquarium, there are other places to play. Compared with expensive taxis and slow buses, car chartering is very affordable.