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金色观察 | 如何查询你的NFT元数据
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关于NFT资产和元数据的重要性现如今你应该已经有所耳闻。说的更具体些，NFT资产和元数据储存在哪里？这是最终的决定性因素，决定你的NFT能持续多久，是否能够永存，或者是否会在某天突然消失？
本文将告诉我们如何确认自己的NFT元数据和资产的储存位置。我们暂且先去看看以太坊区块链上的NFT。 现在就开始吧！ 以太坊NFT 以太坊是一切开始的地方，是NFT诞生的摇篮。所以，当我们看到主要的蓝筹项目都运行在这条链上也就不足为奇了。 让我们以最大的区块链NFT项目——Bored Ape Yacht Club（BAYC）——为例，来说明如何查询FNT元数据。 若要查看一个NFT的详细信息我们需要使用到区块链浏览器。区块链浏览器可以让你浏览所有链上生成和发行的代币以及智能合约的全部信息和详情，只要是和浏览器兼容的链都可以。 针对以太坊网络，我们将使用Etherscan浏览器，它能让用户浏览与其兼容的所有链上生成和发行的代币以及智能合约的全部信息和详情。 访问Etherscan你首先会看到一个搜索框： Etherscan平台已经开发的相当成熟了，现在你可以很方便地只需要搜索项目的通用名称就能查询到结果，不需要费力记住一长串的交易数字或智能合约地址。那么，我们来搜索“BAYC”试试。 请看！ 注意看，在项目名称前面有一个蓝色的标记，表明该项目是经过核验的官方项目。因为有太多的山寨项目，所以切记小心行事。接下来点击“BAYC”。 现在我们来到了Etherscan的BAYC页面，我们可以在页面上方看到这个项目的一些具体信息，比如项目的最大总供应量、NFT持有者数量，以及当天为止代币的转移数量。 向下滚动屏幕，你会看到有很多可点击的选项。我们主要想查看的是生成BAYC NFT代币的智能合约，所以我们向下滚动然后点击“Contract”。 想要查看某个代币的元数据，我们需要点击查看tokenURI。让我们向下滚动到选项20, 也就是tokenURI。在这里有个查询特定NFT代币的搜索框。因为这是一个程序的世界，数字是从0开始的，不是1。所以如果我们想要查看第一个代币，我们需要运行一个对象为0的查询。输入“0”，点击“Query”查询。 Etherscan通过向智能合约发送查询请求与智能合约进行交互，将智能合约的应答展示给我们： 返回的是： ipfs://QmeSjSinHpPnmXmspMjwiXyN6zS4E9zccariGR3jxcaWtq/0
这是一个通向代币元数据文件的链接，文件内容包括所查NFT的所有其他信息，比如实际映像文件的链接，以及所有NFT属性。注意它是托管在IPFS上的，链接是以ipfs://开头的，后面其他的字符代表IPFS的交易ID： （QmeSjSinHpPnmXmspMjwiXyN6zS4E9zccariGR3jxcaWtq/0）。
现在，这还不是一个普通的链接。点击这个链接不会有任何结果，只会返回一个错误页面。这是因为此链接只对IPFS节点可读。所以，我们需要使用网关来访问文件。有很多可用的公共网关，我们用Pi |
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