Consider the TestCoin. Design a structure of the blocks for a blockchain that would allow validation of TestCoins to be decentralized. The objective of this design change is in allowing anybody to verify the validity of the mined coins, rather than using a central server for verifying newly-mined coins. Make sure that the format of your block design includes everything necessary (but nothing more) for verification of new coins, and for validating the integrity of the blockchain. Assume each block contains only 1 newly-mined coin.

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