I use my superficial knowledge to talk about the risks that may be encountered. If there are errors, please correct me, thank you.

If you talk about the blockchain regardless of security, it's a "rogue"; if you promote the blockchain in the name of security, but you don't have any substantial actions, you are brazen.

The theft of digital currency and exchange security incidents occur so frequently that it has become a reason for the public to question the security of its underlying technology, the blockchain. So, let's take a look at the possible blockchain security risks of blockchain technology.

• the risk of Wallet
  All mainstream digital currencies have corresponding digital asset management tools-wallets. Take Bitcoin as an example. At present, there are dozens of mainstream wallets that support Bitcoin, and they are also divided into "software and hardware", "online and offline", "PC and mobile" and other forms.
  
  Due to issues such as historical data, network synchronization, and inconvenience, it is very cumbersome and unrealistic for individuals to run and maintain a huge Bitcoin client to manage assets. More and more digital currency asset management vendors have developed wallet applications or hardware.
  
  In this world, there are always some people who have forgotten the initial key or lost the hard disk due to bad luck or other factors, resulting in the permanent disappearance of digital assets from the network. There are many such cases, and they are often seen in recent news or narratives.
  
  Similarly, there are always some people in this world who are careless, leading to the leak of the wallet key file and causing themselves heavy losses. On Twitter, someone once demonstrated using the AWS S3 resource scanning tool and found multiple Bitcoin wallet key files, wallet.dat, which can be downloaded publicly! Anyone who downloads the file and imports it into the Bitcoin client can transfer encrypted digital assets!
  
  So remember, the money is not exposed, and the wallet.dat file must not be exposed!
  
  The mainstream exchange or wallet management software all provide copying or scanning codes to obtain the receiving address, but if the computer terminal is implanted with a Trojan horse, then the receiving address is also at risk of being replaced during the process of copying or executing the transfer.
  
  In addition to security issues such as "passwords", keys and wallet addresses, the wallet app itself also has greater risks. When using digital currency wallets, you should choose officially recommended wallet software, and resolutely do not use wallet software developed by unknown manufacturers or from unknown sources in social networks.
  
• the risk of Mining
  1. The domain name of the mining pool server is hijacked, and the client has joined a fake mining pool for mining;
  
  2. If there is a virus in the mining server, the wallet address will be replaced during the mining process;
  
  3. The mining software itself is abnormal, and the wallet address is secretly changed;
  
  4. The mining pool server was hacked, resulting in the transfer of the cryptocurrency obtained from mining.