{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to prevent duplicate transactions in a blockchain?","a":"Consensus Mechanism: The consensus mechanism in a blockchain network (such as proof of work, proof of stake, etc.) ensures  the sequence and effectiveness of transactions. When a transaction is added to a new block, the consensus mechanism checks whether the transaction already exists in previous blocks. If the transaction exists, it will be rejected, thereby preventing reuse."}]}],"pr":"371de8bfbd2ff2025aa74fb13219082b3a4e55c0674c49a6bbe188344678d697"}