{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The main problems that blockchain needs to solve are:","a":"Basic performance issues: The block-chain structure of traditional blockchains  makes them unable to support high concurrency, which becomes a bottleneck preventing the large-scale application of blockchains."}]}],"pr":"1a67b0664ca73b091b54f0033d935fe2577b4256cc0ebca5172aae277bd75f6e"}