PHP virtual currency
let me analyze it:
1: bitcoin has been broken in China, and its price has dropped sharply, which is unexpected by the global mining pool
2: compared with the current mining cost of bitcoin, it makes money entirely by cheap electricity bills
3: there are only 21 million bitcoins, and most of them have been g up in the early stage, which makes it difficult to dig those bitcoins that have not been g up in the future, and there is too much competition. Many small mines are in a state of loss
and why do many well-known mines turn to TCD
first of all, bitcoin is the optimized and upgraded version of bitcoin, with a constant number of 100 million. The early mining is very good. Unlike bitcoin, which has too high cost and low cost performance ratio, it is appropriate to use bitcoin as a supplement to compare bitcoin. Bitcoin is used for large amount payment and bitcoin is used for small amount payment.
In addition to the complete implementation of bitcoin's core protocol, bitcoin node software also includes an optional but important function mole -- Wallet:
you can regard the wallet as a safe to store all your keys and addresses, and also encapsulate many technical concepts and details of bitcoin, So that it can be understood and accepted by people other than geeks. Therefore, bitcoin enables node wallet by default. If you want to disable the wallet function, for example, you can set the disablewallet option in the configuration file:
disablewallet = 1
the wallet mole will track all address related transactions managed by it, so it can update the balance information of the wallet in time. This function is very important because there is no concept of account in bitcoin. Bitcoin is e-cash scattered among transactions. If there is no wallet to help track transactions related to our address, it is difficult to figure out how many bitcoins we hold in total
Many RPC calls provided bynodes are implemented by wallet mole. For example, when we call the getnewaddress command, the wallet mole generates the key and address and automatically adds them to the wallet, so its related transactions will automatically affect the balance of the wallet. Similarly, when we call getbalance, the wallet mole will collect the bitcoin on all addresses and return the total amount
the above content is extracted from: bitcoin development course
if you don't understand, I suggest you learn it;
<? php
for($s=0;$ s<= 10;$ s++){//10元[UNK][UNK][UNK][UNK]最[UNK][UNK][UNK][UNK][UNK]10张
for($w=0;$ w<= 20;$ w++){//5元[UNK][UNK][UNK][UNK][UNK] 最[UNK][UNK][UNK][UNK][UNK]20张
for($y=0;$ y<= 100;$ y++){//1元[UNK][UNK][UNK][UNK][UNK] 最[UNK][UNK][UNK][UNK][UNK]100张
if(($s+$w+$y)==20&& amp;( 10*$s)+(5*$w)+(1*$y)==100){//$snot$i
echo$s,"& quot;,$ w, "& quot;,$ y;// echo"& lt; br/>> quot;// 换行< br />}
}
}
结果
0 20 0
4 11 5
8 2 10
How long does it take from Hangzhou Huanglong bus central station to Lin'an east station:
actually, you need to add 10-15 minutes