{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the key features of blockchain?","a":"The key features of blockchain include decentralization, immutable data, transparency, security, and traceability.  Decentralization means that there is no central node in the blockchain network, and all nodes jointly participate in data verification and maintenance; the immutable data is because each block contains the hash value of the previous block, forming a chain structure. Once the data in a certain block changes, it will cause the hash value of the subsequent blocks to change, thereby rendering the entire chain ineffective; transparency is manifested in that all transaction records on the blockchain are public and can be viewed by anyone; security comes from the fact that blockchain adopts encryption algorithms such as SHA-256."}]}],"pr":"3ab3c990f37a90ece8c62eb3d8e45cbe364be10082a47a8f2de4b87ae390230b"}