区链是一种由多方共同维护，使用密码学保证传输和访问安全，能够实现数据一致存储、难以篡改、防止抵赖的记账技术，也称为分布式账本技术。近年来，区链技术的发展对社会产生了重要的影响。本文介绍近年来区链关键技术的发展现状和研究进展。首先从共识机制、互操作性、安全性、隐私保护和可监管性等方面介绍了区链技术的现状和面临的挑战。然后重点从跨链通信技术、区链智能合约、区链安全性、区链监管与隐私保护、区链技术应用等方面分析当前国内外研究现状，并指出了相关技术的发展趋势和展望。作为金融科技的重要技术、数字经济的重要基础，区链技术在未来将发挥重要的作用,技术开发：lxqy1668
In some applications, filtering is crucial.Moderngraphics hardware can deliver mipmapped texture access at very highspeeds,but only by using a linear filtering method.Other filteringmethods are available,and they are needed for some kinds of imagingapplications.
When hardware filtering is unavailable,or when we need theutmost in image ,we can use pixel-shading code to performany arbitrary filter.
GPU shading programs are different from CPU shading programsin one key aspect:generally,the CPU is faster at math operationsthan texturing.In languages such as the RenderMan shadinglanguage,texture()is typically one of the most expensiveoperators.This is opposite to the situation in a GPU.
In GPU shading languages,texture operators such as tex2D()aretypically among the fastest operators,because unlike CPUshaders,GPU shaders don't manage the surrounding graphics state ordisk system.We can use this speed to gain a variety of usefulelements for filtering,such as filter kernels and gamma-correctionlookups.
随着区链应用增多，各个条线区链上承载和存储了大量信息，链与链之间的互联互通成为跨领域、跨行业应用的需求。同时链与链的互联互通也能够*大化的共享区链上存储的数据，有利于价值的*大化利用。跨链技术也成为实现链与链之间互联互通的有效手段，得到了较多的关注。跨链分为同构链的跨链和异构链的跨链。相比较而言，同构链的跨链交互在实现上相对容易，异构链的跨链技术实现难度较大，目前还较不成熟。目前主流的跨链技术有：公证人机制、侧链/中继、哈希锁定、分布式私钥控制等。
