ICVE digital currency Council

1.

The digital currency wallet is the hardware wallet, which means that the private key of digital assets is stored in a single chip, isolated from the Internet, plug and play. Hardware wallet can't guarantee 100% security. For example, if a geek gets your hardware wallet and doesn't know your private key, it may be cracked by violence. It's just one of the safest storage methods compared to other storage methods

many block chain entrepreneurs at home and abroad are optimistic about the development of this field, so they begin to build more hardware wallets. In the case of the exchange being stolen a lot of money and the software wallet being stolen from time to time, many investors regard the hardware wallet as the last moat

extended information:

whether the hardware wallet is safe

the hardware wallet can not guarantee 100% security. For example, if a geek obtains your hardware wallet, it may be cracked violently even if it doesn't know your hardware wallet immediately. It's just one of the safest storage methods compared to other storage methods

of course, there are exceptions, such as you have unlimited brain power and never forget. It's better to save it anywhere than in your own mind

2.

Matlab neural network toolbox can be used to extract samples first, normalize them with mapminmax function, then establish the network with newff function, set training parameters, train them with train function, and finally see the prediction results with SIM function

in the process of training, there is a performance that can be observed, and its training goal is the goal you set. In the process of training, it will automatically separate a part of the samples as validation verification, which can ensure the fitting. In order to evaluate the effect, the accuracy of the final prediction should be considered

The appendix is an example of BP prediction

3. The central bank's test of digital currency does not mean the popularity of digital currency in China. The digital currency issued by the central bank will first be applied to the bill market. It is feasible to use digital currency to issue red envelopes after the Spring Festival, but it is unrealistic to use the digital currency issued by the central bank to issue red envelopes. The scope of digital currency issued by the central bank is still limited
however, it is very realistic to use bitcoin, Puyin, Laite coin, dogcoin and other digital currencies to send red envelopes, which has been done since last year.

4. Okex is a fraud platform. Don't be cheated. I'll sort out the pictures and send them to you to avoid being cheated

5. Yes, but it's a little different from other platforms. Hubi is a global digital asset exchange alliance, the world's first "exchange alliance 3.0" model

6. The app "currency artifact" can view the real-time price
at 17:00 on May 2, $9125 ≈￥ 57767

7. It is suggested to go to the famous exchange, which is safer
for example, coin an, fire coin and okex

8. The problem is cint. Explain the meaning
syntax
cint (expression)
expression parameter is any valid expression

in the case of currency, single precision or double precision operation, use cint or CLng to enforce integer operation
the cint function is used for internationally recognized format conversion from other data types to integer subtypes. For example, the recognition of decimal separators, such as micrometers, may depend on the locale of the system
if the expression is outside the acceptable range of the integer subtype, an error occurs
unlike fix and int functions, cint truncates the fraction of a number instead of rounding it. When the fraction is exactly 0.5, the cint function usually rounds it to the nearest even number. For example, 0.5 is rounded to 0 and 1.5 to 2

do you know why it's wrong& quot; Account number & quot; The format of the value of "Xianshi", which cannot be converted, is certainly not right.

9. Similarities:
both are network security protocols used in e-commerce. Can ensure the security, confidentiality and integrity of transaction data<

difference:
SSL is called secure socket layer protocol. It is the earliest protocol used in the world and has become an instrial standard. However, its basic point is the commitment of businesses to keep customers' information confidential, so it is beneficial to businesses but not beneficial to customers

set is called secure electronic transaction protocol, which is an open standard to ensure the security of credit card payment when online transactions are carried out on the Internet. Because its objects include consumers, merchants, card issuing banks, acquiring banks, payment gateways and certification centers, it is equally beneficial to consumers and merchants.

10. This is too much. In actual work, it is recommended to refer to http://office.microsoft.com/zh-cn/assistance/CH790018022052.aspx Related learning:

database worksheet functions

Microsoft Excel contains some worksheet functions, which are used to analyze the data stored in the list or database. These functions are collectively referred to as dfunctions, Each function has three parameters: database, field, and criteria. These parameters point to the worksheet area used by the function<

daverage returns the average value of the selected database entries

dcount calculates the number of cells containing numbers in the database

dcounta calculates the non empty cells in the database

dget extracts a single record that meets the specified conditions from the database

Dmax returns the maximum value of the selected database entries

Dmin returns the selected number According to the minimum value of the database entry

dpproct multiplies the values in the specific fields of the qualified records in the database

dstdev estimates the standard deviation based on the sample of the selected database entry

dstdevp calculates the standard deviation based on the total number of the selected database entry

dsum adds the numbers in the field column of the qualified records in the database < B R / >
Dvar estimates variance based on the sample of the selected database entry

dvarp calculates variance based on the sample population of the selected database entry

getviewdata returns the data stored in the PivotTable

date and time function

date returns the serial number of a specific date

DateValue converts the date in text format into a sequence Number

day converts the serial number to the date of the month

Days360 calculates the number of days between two dates based on 360 days of a year

edate returns the serial number of the date used to represent the number of months before or after the start date

eomonth returns the serial number of the last day of the month before or after the specified number of months

hour converts the serial number to an hour

minute converts the serial number to minutes

month converts the serial number to months

networkdays returns the number of all working days between two dates

now returns the serial number of the current date and time

second converts the serial number to seconds

time returns the serial number of a specific time

time converts the time in text format to minutes Change to serial number

today returns the serial number of today's date

weekday converts the serial number to a day of the week

weeknum converts the serial number to a number representing the week of the year

workday returns the serial number of days before or after the specified number of working days

year converts the serial number to a year

yearf RAC returns to start_ Date and end_ Year score of days between date

external functions

these functions use add ins (add ins: supplementary programs that provide custom commands or custom functions for Microsoft office.) The program load

euroconvert converts the number into Euro form, converts the number from Euro form to the currency of EU Member States, or uses euro as the intermediate currency to convert the number from the currency of one EU member state to the currency of another EU member state (triangle conversion relationship)

sql.request connects to an external data source and runs the query from the worksheet, and then returns the query results in the form of an array without macro programming<

engineering function

besseli returns the modified Bessel function in (x)

besselj returns the Bessel function jn (x)

besselk returns the modified Bessel function kn (x)

bessely returns the Bessel function yn (x)

BIN2DEC converts binary numbers to decimal numbers

bin2hex converts binary numbers to hexadecimal numbers
< br />
bin2oct converts binary numbers to octal numbers

complex converts real and imaginary coefficients to complex numbers

Convert numbers from one measurement system to another

DEC2BIN converts decimal numbers to binary numbers

DEC2HEX converts decimal numbers to hexadecimal numbers

dec2oct converts decimal numbers to binary numbers Check whether two values are equal for octal number

delta

ERF returns error function

erfc returns complementary error function

gestep checks whether the number is greater than the threshold

HEX2BIN converts hexadecimal number to binary number

HEX2DEC converts hexadecimal number to decimal number

hex2oct converts hexadecimal number to binary number Octal number

imabs returns the absolute value (molus) of complex number

imaginary returns the imaginary coefficient of complex number

imaginary returns the parameter theta, That is, the angle in radians

imconjugate returns the conjugate complex of complex number

imcos returns the cosine of complex number

imdiv returns the quotient of two complex numbers

imexp returns the exponent of complex number

imln returns the natural logarithm of complex number

imlog10 returns the logarithm of complex number with the base of 10

imlog2 returns the pair of complex number with the base of 2 Number

impower returns the complex number of integer power

improct returns the proct of two complex numbers

imreal returns the real coefficient of the complex number

imsin returns the sine of the complex number

imsqrt returns the square root of the complex number

imsub returns the difference of two complex numbers

imsum returns the sum of multiple complex numbers

OCT2BIN converts octal numbers to octal numbers Binary number

oct2dec converts octal number to decimal number

OCT2HEX converts octal number to hexadecimal number

financial function

accountant returns the accrued interest of fixed-term interest paying securities

accountant returns the accrued interest of one-time interest paying securities when e

AmorDEGRC returns each settlement using depreciation factor Depreciation value of settlement period

AmorLINC returns the depreciation value of each settlement period

CoupDayBS returns the number of days from the current interest payment period to the transaction date

CoupDays returns the number of days including the interest payment period of the transaction date

CoupDaysNC returns the number of days from the transaction date to the next interest payment date

coupncd returns the next interest payment period after the transaction date Interest payment date

coupnum returns the number of interest payments between the transaction date and the maturity date

couppcd returns the interest payment date before the transaction date

cumipmt returns the accumulated interest paid in two periods

cumprinc returns the accumulated principal amount of a loan repaid in two periods

DB uses the fixed balance decreasing method, Returns the depreciation value of an asset in a given period

DDB uses the double declining balance method or other specified methods, Return the depreciation value of an asset in a given period

disc returns the discount rate of the security

Dollard converts the price expressed by fraction to the price expressed by fraction

dollarfr converts the price expressed by fraction to the price expressed by fraction

ration returns the annual term of the security with regular interest payment

effect returns Actual annual interest rate

FV returns the future value of an investment

fvschelereturns the future value of the principal after applying a series of compound interest rates

intra returns the interest rate of one-time interest bearing securities

IPMT returns the interest paid by an investment in a given period

IRR returns the internal rate of return of a series of cash flows

ispmt calculation The interest to be paid in a specific investment period

MDuration returns the Macauley correction period of the securities with the assumed face value of $100

mirr returns the internal rate of return of positive and negative cash flows calculated at different interest rates

nominal returns the annual nominal interest rate

NPER returns the number of investment periods

NPV returns the internal rate of return based on a series of periodic cash flows and The present net value of the investment calculated by discount rate

oddprice returns the price of the securities with a face value of $100 on the non fixed down payment date

oddfield returns the yield of the securities with a face value of $100 on the non fixed down payment date

oddprice returns the price of the securities with a face value of $100 on the non fixed end payment date

oddfield returns the price of the securities with a face value of $100 on the non fixed down payment date Return rate of portfolio

PMT returns the regular payment amount of annuity

PPMT returns the principal of an investment to be repaid in a given period

price returns the price of the $100 face value security with regular interest payment

pricesisc returns the price of the $100 face value security with discount issue

PriceMat returns the $100 face value security with interest payment e Price of securities

PV returns the present value of investment

rate returns the interest rate of annuity in each period

received returns the amount of securities with one-time interest payment e

SLN returns the linear depreciation value of an asset in a certain period

Syd returns the depreciation value of an asset in a specified period calculated by the sum of years depreciation method
< br />Tbilleq returns the equivalent yield of treasury bonds

tbillprice returns the price of treasury bonds with a face value of $100

tbillyield returns the yield of treasury bonds

VDB uses the declining balance method, Returns the depreciation value of an asset in a given period or part of a period

XIRR returns the internal rate of return of a group of irregular cash flows

xnpv returns the net present value of a group of irregular cash flows

yield returns the rate of return of regular interest bearing securities

YieldDisc returns the annual income of discount issued securities (such as treasury bonds) Yield

YieldMat returns the annual yield of the securities e for interest payment

information function

cell returns the format, location or content of the cell

error.type returns the number of corresponding error types

info returns the information about the current operating environment

isblank if the value is empty, Then return true

iserr if the value is any error value except # n / A, return true

ISERROR if the value is any error value, return true

iseven if the number is even, return true

islogical if the value is logical, return true

ISNA if the value is # n / a error value, If the value is not text, return true

isnumber if the value is a number, return true

Isodd if the value is odd, return true

isref if the value is a reference value, return true

istext if the value is text, Then return true

n return the value converted to a number

Na return the error value # n / a

type return the number of the data type representing the value

logical operator

and if all its parameters are true, Then return true

false return logic value false

If specifies the logic test to be performed

not logical inversion of its parameters

or if all parameters are true, return true

true return logic value