{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do transactions expire in a blockchain?","a":"Create a smart contract:  First, developers need to write a smart contract to handle transactions on the blockchain. The smart contract contains a series of functions for performing operations such as transferring, locking, and unlocking."}]}],"pr":"5be5002f0f8a764b16d06401542bbed96e1acd65a39309fad651c8eae11ef82b"}