Bitcoin QT

1. Not only the website you mentioned, but also exchanges such as btctrade international station, fire coin and coin an are trading. Maybe you can see that the website has been transferred overseas, but the current exchange does not display domestic IP, so it is still accessible in China

2. It depends on whether the wallet has the function of automatic collection. If it is not open, it can't be withdrawn. However, bitcoin cash has been born for a long time, and it can't be withdrawn
on August 1, 2018, bitcoin carried out a hard bifurcation to proce BCH. BCH is the result of community division, not a kind of bifurcated coin. BCH has its own strong community support. However, at that time, some wallets did not support BCH to collect.

3. Modifying G + + compiler with QT Creator

4. This problem I have encountered, I 2003 system under the wallet, found that the wallet data file is wrong! Thought it was a problem with the 2003 system! Specially modified 64 bit win7, error still! I don't know what's wrong! I feel that I have been following the upgrade of bitcoin wallet all the time! Up to now, it's 1.49M, but no matter how I make it, it's all a mistake! At first, delete all the block chains, only one wallet data file! After the update is completed, you can see that it is normal for a period of time. If you open the wallet for a long time, you will report an error again. After the error is reported, unless the reconstructed data is displayed normally for a period of time again! But still can't solve the problem! Back to the original just built wallet file, just set the password, just set up the collection address data backup out to use, the result is no problem! And all bitcoin is still there! By contrast, when using the 1.49M wallet data file, the record of the latest received bitcoin can't be written in, and then it's OK to look at the data backup file. Anyway, there are no recent transaction records, but there are so many bitcoins, so the error should be here! But I don't know how to solve this problem, I can only use the original wallet backup, fortunately, there is a 300 K backup at the beginning, otherwise it's finished! Now there is no problem, this problem has to be reported to the official!

5. This is a drawback of bitcoin. You can't delete it. You have to resynchronize after deleting it. Of course, you can use light wallet, but its security is not as good as this one

6. The wallet file downloaded from bitcoin QT client is wallet.dat, and the wallet file downloaded from multibit client is multibit.wallet. The file name, size and format of these two files are different, so how to switch? If you don't need to save the original address, send the coin directly to the multibit address

7. No backup dat file. If you delete it, you lose it.

8. Let's talk about the version problem
1. Ubuntu 8.10 (intrepid ibex) alternate i386 (ISO)
represents text installation, which is suitable for Intel platform
2. Ubuntu 8.10 (intrepid ibex) desktop i386 (ISO)
represents graphics installation and use version, It is also the Intel platform
3. Ubuntu 8.10 server AMD64 (ISO)
this is the server version for AMD CPU
4. Ubuntu 8.10 (intrepid ibex) server i386 (ISO) Ubuntu 8.10
the server version for Intel CPU
5. Ubuntu 8.10 (intrepid ibex) alternate AMD64 (ISO)
the text installation version for AMD CPU
the software in the Ubuntu software source is very popular Rich, no need to search around like windows software; There are many software installation tools on Ubuntu, which are easy to use. The command-line installation tools provided by the Ubuntu system include apt get, dpkg, etc., and the graphical installation tools include update manager, add and delete programs, and xinlide package manager, etc, We can easily complete the installation and upgrade of the software.
install the software we download from the Internet.
the common formats of the software installation package we download from the Internet are. DEB and tar. GZ. Generally, we can only use the command line to install.
files ending with. DEB, such as XX.. DEB, are equivalent to executable files in Windows system, For example, in the Gnome integrated desktop environment, you can directly double-click the software package, and then the gdebi graphical installation tool will be automatically started for installation. For example, in the terminal environment, you can enter the command "dpkg – I xx. DEB" to install. For deleting XX software package, you can enter the command "dpkg – r XX". "
the file ending with. Tar.gz refers to the file packed with tar command and compressed into gzip format, Such a file usually contains the source code of the software. To compile the source code, the software package build essential (including common programming tools and function libraries) is required to be installed in the system. Use the command "sudo apt get install build essential" to install the software package, We usually use the "sudo tar zxvf XX. Tar. GZ" command to unzip the file. After unzip the file, the XX directory will be generated in the current directory. Then enter the directory and enter the command "sudo. / configure" to check the system environment. If the test is passed, the compilation script will be generated. Then enter the command "sudomake" to compile, If the compilation is successful, the binary executable file will be generated in the current directory, After that, enter the command "sudo make install" to the binary executable file to the system global path or the specified directory.
tips: the command line installation tool on Ubuntu
1. Apt get command
apt get command is the most commonly used command line installation tool in the Ubuntu system, It's very convenient and quick to install software from software source by using apt get command. The parameters of apt get command are "Install" and "update". The command "sudo apt get
Update" is used to get the latest list of available software packages from software source server. After adding the address of a software source server to / etc / apt / sources.list file, the, The command "sudoapt get install
soft" allows us to download and install software online from the software source, where "soft" is the name of any application or program. To install network scanning tool nmap, enter the command "sudo
apt get
install nmap" in the terminal window, The apt get command will automatically find the latest version of nmap in the software source, and calculate the amount of data downloaded and the space required for installation. After the user confirms, the nmap software can be downloaded and installed online. To delete the package, use the command "sudo apt get remove nmap". "
2. Dpkg command

Ubuntu is developed on the basis of Debian distribution, It also supports Debian packages (files ending with. DEB), so many software installation packages on Ubuntu
are in the form of DEB packages. Dpkg (package manager for
Debian, Debian package manager) is a command-line tool for installing, creating and deleting Debian packages Suggestions for Ubuntu novices
when you don't know the specific name of the application software, use the search function provided by the installation tool or search online; When you have mastered the installation tools and software installation methods provided by the Ubuntu system, you will find that installing software in Ubuntu is also a kind of fun!

9. It is recommended to install additional software (righted software) of Ubuntu in the software center. You can find it by searching Ubuntu, which comes with flash plug-ins, fonts, decoders and other commonly used non open source software; You can also use sudo apt get install Ubuntu restricted extra Ubuntu restricted addon in the terminal to install these software.