{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"Why do block hashes expire in transactions?","a":"The expiration of block hashes in transactions is due to the adoption of the Proof of Work (PoW) consensus mechanism in blockchain. Under the PoW mechanism, miners need to prove that they have completed the corresponding work by solving a complex mathematical problem to receive block rewards. As the blockchain network continues to evolve, mining difficulty gradually increases, requiring miners to invest more computing power to complete mining tasks.↵↵During this process, block hashes serve as a key parameter for mining, ensuring that blocks are linked in chronological order to form a tamper-proof chain structure. The block hash represents the unique identifier of a block and is calculated based on the data contained in the block. As the mining difficulty increases, the computational complexity of generating a block hash also increases, making it more difficult for miners to produce new blocks.↵↵However, it's worth  noting that the PoW consensus mechanism has its limitations, such as high energy consumption and centralization risks. To address these issues"}]}],"pr":"2d1fb39290c24433a809d975653f1f6a72d22c4e46f313c32322d33f87bf2f15"}