{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can the security model in blockchain be improved to prevent long-range attacks?","a":"Introducing Weak Subjectivity mechanism: Require all nodes in the entire network to  periodically check the latest blocks, and reject blocks that reorganize records that are too old. This can effectively reduce the likelihood of fake chains created by attackers being accepted."}]}],"pr":"6b82bb9e7c384931767a060b66d2952129612d9ec268fdf1ab72742b680cbf71"}