How much is the closing price of digital currency contract safe
The contract transaction of digital currency is not safe. There are still many loopholes in the digital currency trading platform, for example, the most common are the following six kinds:
1. Denial of service attack
denial of service attack is the most important attack against the digital currency trading platform at present. Through denial of service attack, the attacker makes the trading platform unable to access normally, Because users can not accurately distinguish the degree of attack, it often causes panic asset transfer, which brings some loss
2. Phishing incident
even the best technical measures at present can not make the digital currency trading platform avoid phishing attacks. Some hackers and criminals can confuse digital currency investors by means of fake domain names or fake pages, while ordinary investors can't identify the authenticity, so it's easy to cause asset losses
Many digital currency trading platforms use a single private key to protect the hot wallet. If hackers can access a single private key, they can crack the hot wallet related to the private key. For example, in the attack on yapizon of Seoul stock exchange in 2017, the attackers stole hot wallets from the trading platform twice in a year, resulting in a total loss of nearly 50% of the assets of the trading platform and eventually leading to the bankruptcy of the trading platform Fourth, e to the lack of perfect risk isolation measures, or ineffective supervision on the rights of employees, some employees who have the operation rights of the platform use internal trust to seek unjust wealth for themselves. For example, in 2016, the event of employees stealing bitcoin on shapeshift caused a total loss of US $230000 to the trading platform by stealing and reselling sensitive information to others Fifth, the software vulnerability of digital currency trading platform includes single sign on vulnerability, OAuth protocol vulnerability and so on. At present, all countries have laws requiring banks or other financial institutions to implement information security measures to protect customers' deposits. However, e to the fact that the blockchain field is still in its infancy, there is a lack of such specifications for encrypting digital assets. Therefore, it is not accidental that many trading platforms have a large number of loopholes in the absence of security constraints 6. Transaction malleability the technical supporters of blockchain often think that blockchain transactions are highly secure because they are recorded on records that are said to be unchangeable, but each transaction needs to have a corresponding signature, and the records can be forged temporarily before the final confirmation of the transaction 
extended data:
rules of contract transaction
1. Transaction time
contract transaction is 7 * 24 hours transaction, which will be interrupted only ring the settlement or delivery period of 16:00 (UTC + 8) every Friday. In the last 10 minutes before delivery, the contract can only be closed, not opened
Transaction types are divided into two types, opening and closing. Opening and closing positions are divided into two directions: buying and selling:buying open long (bullish) refers to buying a certain number of contracts when users are bullish and bullish on the index. Carry out "buy open more" operation, match success will increase long position
selling pingo (multi order closing) refers to the selling contract that the user makes up for when he is no longer bullish on the future index, offsets with the current buying contract and exits the market. Carry on "sell flat much" operation, match after success, will rece long position
short selling (bearish) refers to the new sale of a certain number of certain contracts when the user is short or bearish on the index. Carry out the operation of "sell short" and increase the short position after successful matching
buy close (short single close) refers to the buy contract that the user will not be bearish on the future index market and make up for, offset with the current sell contract and exit the market. Carry out "buy short" operation, after matching successfully, short position will be reced
3. Order method
limit order: the user needs to specify the price and quantity of the order. Limit order can be used for opening and closing positions
order at opposite price: if you choose to order at opposite price, you can only enter the order quantity, not the order price. The system will read the latest competitor price at the moment of receiving the entrustment (if the user buys, the competitor price is the selling price of 1); If it is a sell, then the counter price is buy 1 price). Issue a price limit order for this counter price
4. Position
the user owns the position after opening and trading, and the positions in the same direction of the same contract will be merged. In a contract account, there can only be 6 positions at most, that is, multiple positions of current week contract, short positions of current week contract, multiple positions of next week contract, short positions of next week contract, multiple positions of quarterly contract and short positions of quarterly contract
5. Order restriction
the platform will restrict the number of single user's positions in a certain period of contract and the number of single open / close positions, so as to prevent users from manipulating the market
when the number of positions or entrustments of users is too large, the platform has the right to require users to take risk control measures, including but not limited to cancellation of orders, closing positions, etc. The platform has the right to adopt measures including but not limited to limiting the total number of positions, limiting the total number of consignments, limiting the opening of positions, withdrawing orders, forcibly closing positions, etc. for risk control
generally speaking, it is a local area network. Internet cafes, campus networks and office networks all belong to this category. In addition, fiber to the building, community broadband, ecation network, cable modem Internet, although the geographical scope is relatively large, but in essence, it is still based on Ethernet technology, so it still belongs to the intranet< How to judge whether I am an intranet or not
you can ask your ISP to see if you are one of the above users. If you dial up every time you surf the Internet, you are not an intranet user. But the situation is not absolute! A more reliable method is to judge by IP address
open the command prompt window (start → run Win9x, enter command.com Win2K, XP, enter cmd.exe), and enter ipconfig at the DOS prompt
the IP address of the machine is displayed in the IP address item
when the IP address is one of the following three forms, you are in the intranet:
10.0.0-10.255.255
172.16.0.0-172.31.255.255
192.168.0.0-192.168.255.255
if you have multiple network connections, as long as one IP does not match one of the above three forms, then you are not in the intranet
Third, I am an intranet, how to improve the speed of BT download
first of all, it is recommended that you upgrade your system to XP. This is because the total bandwidth of the intranet is limited. When the bandwidth is tight, users using Win2K and XP have an advantage over users using Win9x. Secondly, most of BT software consumes system resources. Under Win9x, it is very easy to cause the system to slow down, lose response and even blue screen, while XP based on NT kernel is much better than Win9x in resource management and stability
client software I strongly recommend BitComet
BitComet is a P2P free software based on BitTorrent protocol; Efficient network kernel, multi task download at the same time, still keep little CPU memory occupation; It supports selective downloading of files in a torrent; Disk cache technology can effectively rece the damage of high-speed random read and write to the hard disk; Only one monitoring port is needed to meet all download needs; Automatically save the download status, no need to scan the file again, no need to scan the file for seed; Support multi tracker protocol; Green software, do not need to install, only run-time Association. Torrent file; Multi language interface. Its original name was simplebt. It also supports UPnP automatic port mapping, automatic opening of windows network sharing and firewall port
Run BitComet after installation to open the options dialog box. In the advanced settings item, make sure to select "support tracker's intranet report extension", in the network connection item, select all the options, and in the disk cache item, increase the cache value according to your memory (so as to avoid premature warping of your hard disk)< 4. I've done what I said before. Why not I can't upgrade to XP for some reason)
then you need to do port mapping. If you surf the Internet through proxy server, you can use portmap to do port mapping on the server. Please click here to download portmap
if you use a router, the setting method of each router may be different. So please read the router manual or consult the dealer
this operation enables all kinds of services on LAN to be accessed by Internet
software mapping
winrote Pro is a proxy server software that integrates router, DHCP server, DNS server, NAT and firewall. At the same time, it is also a mail server software that can be applied in LAN. Therefore, it can not only realize that all microcomputers in LAN share an Internet connection (connection mode includes modem, ISDN, xDSL, DDN It can also realize the mail management in LAN and the mail exchange between LAN and Internet
winroute software is very simple to install and use. It only needs to be installed on the server. It is an excellent proxy server software for LAN sharing Internet connection. It can realize reverse proxy function by port mapping, and let the external access some services provided by the internal network protected by Nat
porttunnel means "port channel" in Chinese. Its function is to specify a channel on the server for the client's computer, so that the client can directly establish a connection with the Internet. It must run on the server side to achieve the purpose of port mapping<
port mapping of ADSL
some adsls have built-in proxy function, which enables us to realize multi machine sharing and Internet access without the need of host computer, but it is impossible to access web, FTP and other services from outside network. Next, we use omni-directional ADSL 1680 to realize the service of accessing intranet web service from outside network
access IP address: 10.0.0.2 (this is the default intranet IP address of 1680), the default user name is "admin", and the default password is "qxcommsupport"
click "virtual service" to enter the main interface of port mapping configuration
fill in the "public network port" with the port 80 that we want to open on the Internet, and fill in the "Intranet port" with the port 80 that has been opened on the intranet machine
select whether "port type" is TCP protocol or UDP protocol (for example, TCP is used for web and FTP protocol, and UDP is used for QQ protocol)
finally, add the IP address of the intranet open web service to the "host IP"
broadband router port mapping
Enter "192.168.0.1" (assuming that the IP is a router) in the IE address bar to log in to the router
enter the initial password
click "virtual server / DMZ" to enter the configuration main interface of port mapping
if you want to add a web server, check "HTTP (port 80)" and fill in the last digit of the IP address of the intranet host, enter the port number 80 in "(Port No.)" and click the "save" button below to add a port successfully
in fact, the use of winroute, porttunnel, ADSL and broadband router is very simple. We only need to add different IP addresses and ports to realize various services. Making good use of the mapping function of software and hardware will bring infinite convenience to our application on the network
intranet is the opposite of public network
Bus line: Rail Transit Line 2, about 25.2km long
1. Walk about 1.4km from Hubei hongtongyuan securities investment fund to Huquan station
2. Take Rail Transit Line 2, after 16 stops, to Changgang Road Station
3, walk about 2.1km, to Wuhan Central Hospital
bus line: 618 → 805, about 26.3km long
1 Walk about 210 meters from Hubei hongtongyuan securities investment fund to Kangfu Road Station on chukang road
2, take No. 618, pass 15 stops, reach Dongting station on Zhongbei Road subway
3, take No. 805, pass 16 stops, reach Houhu District Station of gusaoshu Road Central Hospital
4, walk about 160 meters, and reach Wuhan Central Hospital