区块链技术作为一种新型的分布式账本系统，具有数据不可篡改，透明公开，去中心化等独特的优势。在区块链上交易与数据的去中心化和透明化，也为数据的查询带来了全新的方式，从而使得数据查询的效率和准确度得到了大幅提升。
Block chain technology, as a new type of distributed accounting system, has unique advantages, such as data integrability, transparency and decentralization. Decentralization and transparency of transactions and data on block chains also bring new ways of searching data, leading to a significant increase in the efficiency and accuracy of data queries.
首先，我们需要确定要查询的区块链是哪一个，因为每一个区块链都有自己的链码或智能合约存储着不同的数据。比如，如果要查询以太坊区块链上的数据，就要通过以太坊的节点来实现查询。
First, we need to determine which block chains to search, because each block chain has its own chain number or a smart contract to store different data. For example, if you want to search data in the box chain, you have to do it by using the node in the node of the node.
区块链浏览器是一种非常便利的查询工具，市面上已有如比特币区块浏览器、以太坊区块浏览器等多个应用。
Block-chain browsers are a very easy search tool, and several applications, such as bitcoin block browsers and Etheria block browsers, are available on the market.
下图是以太坊区块浏览器Etherscan的查询页面：
The following is a query page on the Taiwan block browser Ethercan:
在Etherscan具体页面中，可以通过输入钱包地址、区块高度、交易哈希等多个方式来查询区块链上的数据。查询完毕后，我们可以得到数据的详细信息，包括交易记录、合约代码、转账记录等。
In the Ethercan page, you can search the data on the block chain by entering wallet addresses, block heights, transactions, etc. After searching, we can get details of the data, including transaction records, contract codes, transfer records, etc.
使用区块链API可以编写API调用请求，并将其发送到节点服务中心。当数据被成功提取并返回时，我们也可以得到需要的结果。通常，使用API进行查询比起使用区块链浏览器要更加高效。
Use the block chain API to prepare API call requests and send them to the node service centre. When data are successfully extracted and returned, we can also get the results we need. Usually, API queries are more efficient than using a block chain browser.
常见的区块链API服务有Infura、Alchemy、QuikNode等。
Common block chain API services include Infoura, Alchemy, QuikNode, etc.
如果我们对区块链的数据分析和处理比较深入，那么区块链数据的下载和解析也是必须的。
If we analyse and process the data in the block chain in greater depth, then the downloading and deconstructing of the block chain data is also necessary.
对于比特币和以太坊等主流区块链，已有多种数据获取工具，比如BitcoinCore、Geth等，可以大规模地进行数据获取。同时，我们也可以使用Python语言和其它语言的相关库，在代码级别上快速完成区块链数据的获取和解析。
For mainstream block chains such as Bitcoin and Etheria, there are a number of data acquisition tools, such as BitcoinCore, Geth, etc., that can be accessed on a large scale. At the same time, we can quickly complete the acquisition and resolution of block chain data at the code level using relevant databases in the Python language and other languages.
在区块链的不断发展和普及中，数据查询是区块链的重要环节之一。无论是普通用户还是开发者，了解区块链数据查询的基本方法是很有必要的。我们可以通过区块链浏览器查询、区块链API访问、区块链数据的下载和解析等多种方式来进行区块链数据的查询和分析，进而更好地了解区块链的运行机制和优越性。
Data queries are an important part of the block chain as it evolves and becomes more widely available. It is essential for ordinary users and developers to know the basic method of searching block chain data. We can search and analyse block chain data in a variety of ways, including block chain search, block chain API access, block chain downloads and analysis, and thus better understand the mechanisms and advantages of the block chain.
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