[ Click here for the original Japanese version of the article / 日本語版はこちら ]OverviewI have created a smart contract on the Flow blockchain that allows for a snapshot of the list of NFTs owned by a particular address.Once a snapshot is created, it becomes easy to prove ownership even later on. This accuracy is guaranteed by the smart contract's code.I have also developed a feature to display the snapshot. This is extendable by anyone.Let's think about the importance of ownership histor...