{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do you perform multi-signature in a blockchain?","a":"On-chain Signature Collection: To improve security, some researchers introduced smart contracts that can collect signatures directly on the blockchain. The smart contract is  deployed on the blockchain, specifying the minimum signature number M and the authorized signer list N. The contract has a state used to track"}]}],"pr":"74f5069d6dca51a0fea382342f10919d83d24faf9d8e053ed342cc59d5ff8152"}