世界上没有完全相同的两片叶子，也没有两个完全相同的NFT。NFT全称是 Non-Fungible Token，译为非同质化通证，意味着每一件都不可替代，它拥有独一无二的属性。作为蓝海市场的NFT，由链承载，链上流通，加密确权，其价值被越来越多的人认可，它的爆炸性增长正在推动Web 3.0的发展。
There are no identical leaves in the world, nor are there two identical NFTs. The NFT, fully known as the Non-Fungible Token, translates into a non-homogenous pass, means that every piece is irreplaceable and has a unique attribute. The Blue Sea market, NFT, is carried by chains, circulates on chains, secure encryption , whose value is increasingly recognized, and its explosive growth is driving the development of Web 3.0.
目前NFT已经被广泛应用在艺术、收藏品、虚拟资产等领域，例如，用户购买NFT产品，从而拥有区块链提供的所有权证明，艺术家作品的版权得到妥善保护。提供ETH域名的以太坊名称服务，已将每一个域名变成了不可替代的NFT，形成虚拟资产。NFT也将逐渐渗透到现实世界中，人类的方方面面都可转化成NFT，并让我们更好地控制数据。
is now widely used in areas such as art, collections, virtual assets , such as the purchase of NFT products by users, thereby possessing ownership certificates from block chains, and the protection of artists' copyrights. The ETH domain name service has turned each domain name into an irreplaceable NFT and a virtual asset. NFT will gradually penetrate into the real world, where human aspects can be transformed into NFT and allow us to better control data.
但有一个非常现实的问题摆在我们面前，如何妥善的保管NFT呢？区块链技术的应用落地，给互联网的使用带来前所未有的便捷，但仍存在一些瓶颈，比如以目前的市面上的分布式存储系统而言，只能链上存储哈希值，如果保管不当，NFT的资产很有可能一文不值。
But there is a very real question before us , how can
举例来说，用户购买一个视频的NFT产品，虽然在链上能查询到这件产品的所属权信息，由于视频文件内存过大，传输效率、存储成本等多重因素，平台并没有链上去中心存储，而是采用链下保存资产数据的方法，也就意味着，如果有一天存储平台超负荷存储大量的数据，那么你所购买的NFT产品，很有可能就此丢失了。
For example, the fact that users purchase an NFT product for a video, although information about the ownership of the product can be found on the chain, and because of the multiplicity of factors such as excessive storage of video files, transmission efficiency, storage costs etc., the platform does not have a chain of storage at the centre, but rather uses the method of keeping asset data under the chain , means that if one day the platform is overloaded with a large amount of data, there is a real risk that the NFT product you purchase will be lost.
目前的做法是将核心数据上链，通过 API 接入外部分布式存储系统，链下存储大文件，如 ETH 通过 Infura 去链接 IPFS 完成数据的存储、读取、检索等服务，但是这样也带来极大的弊端：文件存储完全依赖外部系统！
The current approach is to chain core data through API access to an external distributed storage system , where large files such as ETH access to IPFS to complete data storage, reading, retrieval, etc. services through Infoura, but this also creates a huge disadvantage:
XVB分布式存储服务器
XVB distributed storage server
基于以上种种，永旗区块链，开发出XVB分布式存储服务器，提出了ISS二层存储网络技术的解决方案。ISS是点对点、版本化、内容寻址的超媒体传输协议，集成了多项前沿的技术，如P2P网络传输技术、BitTorrent、非对称加解密技术、隐私保护技术、数据分片技术，用户可以自行进行加密，谁存谁用或者授权使用，更加能保障数据隐私安全。
Based on the above, the XVB distributed storage server was developed, and solutions were proposed for the ISS second layer storage network technology. ISS is a supermedia transfer protocol for point-to-point, version, content search , which brings together cutting-edge technologies such as
ISS 作为XVB服务器的二层存储，兼容 IPFS 协议，将使分布式存储系统从存储几个字节或者几百个字节，一下提升到大文件大数据上链存储，并实现链相关的经济制度。它采用三步走的路线，先是中心化、弱中心化、最后是去中心化的路线。
The ISS, as the second layer of the XVB server, is compatible with the IPFS protocol, which will upgrade the distributed storage system from several bytes or hundreds of bytes to large file data upper chain storage and achieve the economic system associated with the chain. uses a three-step route that begins with centralization, weak centralization, and finally decentralization.
首先通过ISS存储集群，先将数据保存下来，再由XVB存储服务器中完成工作量证明的节点，复制存储数据，最后再广播给所有节点，进而实现去中心化的存储。也就是说，在XVB存储服务器上存储的NFT，必须让一定量的工作节点进行区块打包上传到XVB服务器上保存，整个存储过程才算完整。当然，资产拥有者也可使用XVB服务器检索功能查看资产或交易资产。所以，存储在XVB服务器上的NFT能够得到有效的安全保障。
First, through the ISIS storage cluster, the data are saved, then the workload-certified nodes are completed on the XVB storage server, the stored data are copied, and finally broadcast to all nodes, leading to decentralised storage. That is, the NFT stored on the XVB storage server by
与此同时，XVB存储服务器采用的是主网存储文件的哈希值，二层存储网络存储原始文件。它的存储流程是这样的：
At the same time, the XVB storage server uses the Hashi value of the files stored on the main network, the second layer of the storage network to store the original files. The storage process is as follows:
XVB存储服务器存储流程
storage process for the XVB storage server
上传文件流程：在XVB服务器的主网上，用户将NFT的相关文件信息打包交易，签名后广播给存储节点。再通过 XVB存储服务器存储提供的 SDK 接口将文件上传到其中一个存储节点。节点对文件内容 Hash，文件大小等信息进行相应校验，一旦校验成功，该节点会将交易信息广播给其它所有生产者，表示文件已经保存成功；其他节点会通过P2P 网络同步保存文件信息，并上传保存成功的证明，前 n-1 个节点上传的证明会获取存储奖励。
uploads documents to one of the storage nodes . Node verifies the content of the document, Hash, file size, etc., and once verified, the transaction information will be broadcast to all other producers, indicating that the document has been saved; other nodes will synchronize the document information through the P2P network and upload the certificate of success, which will receive the storage incentive from the n-1 node.
在XVB服务器的二层存储网络ISS上，NFT原始文件直接保存。
NFT original files are stored directly on the second layer storage network ISIS on the XVB server.
下载文件流程：用户从服务器的存储节点排名列表选择一个，发起查询/下载交易，待交易打包成功后，获取到交易凭证，然后通过凭证向节点发起查询/下载请求。用户可根据需求，直接从ISS二层存储网络上下载。
downloads file flow: users select one from the server's storage node ranking list, initiates query/downloading transactions, obtains transaction vouchers when the transaction is packaged, and then initiates query/downloading requests to the node through the certificate. The user can download directly from the ISS 2-storage network, as required.
XVB存储服务器的存储特点如下：
The storage characteristics of the XVB storage server are as follows:
·它作为分布式去中心化存储服务器，支持无限存储和有效存储，提供商业级大数据上链，通过数据裁剪和释放冗余的数据，能够发挥共享经济的优势，降低存储成本。
As a distributed decentralised storage server, supports unlimited storage and efficient storage ·强大的隐私保护功能，数据分成碎片并编码，使用可配置数量的冗余分片，经过加密后分散存储在众多节点上，保证总体数据不被泄露，而且协议的内容寻址体系结构能够确保数据的完整性和可验证性。 • The powerful privacy protection function of , which divides the data into fragments and encodes them, uses a number of redundancies that can be configured and stored in a variety of nodes encoded to ensure that the overall data is not leaked and that the content location structure of the protocol ensures the integrity and verifiability of the data. XVB存储服务器，为web3.0时代中的数据所有权、信任提供了技术构造，能够近一步扩展NFT生态蓝图，使得商业级大数据上链成为现实，也帮助人类社会更加有效的掌握和利用数据，实现价值互联网。 The XVB storage server, which provides the technical architecture for data ownership, trust in the web3.0 era, allows for the near-expanding of the NFT ecological blueprints, makes the high-level commercial data chain a reality and also helps human society to acquire and use data more effectively and to realize the value of the Internet.
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