{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"Why are SHA-256 hash values used in blockchain?","a":"Data Integrity: The SHA256 hash function can convert input data of any length into a fixed-length hash value, and the hash value is unique. This means  that when the data changes, the hash value will change significantly. Therefore, by comparing the hash values of new and old data, we can determine whether the data has been tampered with."}]}],"pr":"8bde1f027f5146f8be7a02e83205febb947f6cc6daaaaf847b0da61062211155"}