{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does the crisis module in blockchain test Invariants?","a":"Cryptographic techniques: Blockchain systems use cryptographic techniques such as  hash functions and digital signatures to ensure the security and integrity of data. Hash functions convert data in the block into unique hash values, and any modification to the block data will cause the hash value to change. Digital signatures are used to verify the authenticity of the initiator and the content of the block data."}]}],"pr":"37f6ce6bfa099905cede2650fb2740bc761df044f881fa2cc27939a4791d0728"}