Decentralized services, data unchangeable

1.

The decentralization of blockchain refers to the form of social relations and content generation formed in the process of blockchain development. It is a new network content proction process relative to "centralization"

blockchain is an important concept of bitcoin, which is essentially a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains the information of a batch of bitcoin network transactions, which is used to verify the effectiveness of its information (anti-counterfeiting) and generate the next block

blockchain is unified in the whole network, so it is logically centralized. From the perspective of architecture, blockchain is based on peer-to-peer network, so it is decentralized. From the perspective of governance, blockchain makes it difficult for a few people to control the whole system through consensus algorithm, so it is decentralized

extended data:

characteristics of blockchain Decentralization:

decentralization, not without the center, but by the node to freely choose the center, freely determine the center. In short, centralization means that the center determines the node. The node must depend on the center, and the node cannot survive without the center

in a decentralized system, anyone is a node, and anyone can be a center. Any center is not permanent, but phased, and no center is mandatory for nodes

with the diversification of network service forms, the decentralized network model becomes more and more clear and possible. After the rise of Web2.0, the services provided by Wikipedia, Flickr, blogger and other network service providers are decentralized. Any participant can submit content, and Internet users can create or contribute content together

reference source: network blockchain

reference source: Network decentralization

2. Blockchain is not broken. Blockchain itself is a kind of decentralized database, which can be accessed but not tampered with. Therefore, it is a very secure data chain

3. You can change the database...
change the name of the database

add one or more new data files to the database. You can choose to put these files in a user-defined file group. All files added in an alter database statement must be placed in the same file group

add one or more new log files to the database

remove a file or filegroup from the database. This can only be done if the file or filegroup is completely empty

add a new file group to the database (adding files to this file group must use a separate alter database statement)

all these are OK

4. If it's your own input, don't let others modify it, the operation is as follows:
click the menu tool, protect, protect the worksheet, and enter the password (be sure to remember). In this way, no one can change any data. If you want to input it, just unprotect it
if other places can be modified except column D, select columns a to C, right-click to set cell format, protect, and remove the check before "lock"

if you are in column D, once you input data, you can't modify it. You have to use macro, which is troublesome.

5. Generally, there is something wrong with the server side

1. The server is protected from writing data. In this case, you need to contact the server provider and ask them to open the write permission

2. The database is suspended. In this case, you need to contact the server provider and ask them to restart the database, Open the database write permission

3. The server side is abnormal, and the database cache cannot be updated. This situation may cause that even if you update the data in the background and save it successfully, the foreground still cannot be updated. You also need to contact the server provider and ask them to restart the service program, Clear the cache

the above three situations need to be solved by the server provider

in some cases, the background cannot be updated e to your own browser or network abnormality

you can try another browser, and check whether the network is unblocked

if it is not the browser or network reason, please contact the server provider, Only they can solve it

6.

You can set protection in Excel. The specific setting method is as follows (if you want to set the column that cannot be changed is column a):

1. Select the whole worksheet, right-click, set cell format - protect, hide, remove the previous hook - OK

7. Yes, right - click the property on the mailbox store, find the corresponding entry, and change the directory

8. 1. Make a complete backup, including the database and all programs, pages, pictures, to prevent accidents
2. Set the TTL of DNS to a short time, usually a few minutes, so that ISPs and search engines can view DNS information at any time instead of using the IP address in the cache
3. Register a new host account and upload files to the server
4. Confirm that all files are running normally on the new server, change the domain name server, resolve the website to the IP address of the new server, and keep the website running on the server. You can consider closing the user to publish new content on the old server to prevent the transfer process from losing the new data
5. After checking the log file on the new server and confirming that the search engine spider starts crawling the interface on the new server, the transfer is completed. To be on the safe side, you can wait two or three more days to make sure that all search engine spiders know that the website has been transferred to the new server and IP address
6. After confirming that the parsing process is completed and there are no users or search engine spiders on the old server, close the old server and the transfer process is completed
in the whole process of server transfer, the website can be accessed normally all the time, so it will not affect crawling, collection, ranking and so on. I hope what I said can help you.

9. 1. Check whether the conditional format is set. Check method: format, conditional format. Delete if any
2. Check whether the worksheet is protected and the cell format is limited. It's less likely
check method: tool, protect, protect worksheet
3. Your excel installation error

10. The data after closing is not allowed to be modified. If you want to modify it after closing, you need to cancel closing. If it is a financial voucher, you can cancel checking and posting. If it is a supply chain data, you need to delete the generated voucher and invoice before you can change it. You need to be familiar with the process.