Project PAI公布技术进展，Catena NFT 平台即将上线！

2021年3月14日，一年一度的PAI Day火热来袭，为了感谢PAI爱好者一如既往的支持，Project PAI核心开发者通过社区展开了AMA活动，并给予百万空投奖励回馈广大PAI贡献者和社区成员。以下是AMA问题精选：

【第一问】 感觉Project PAI沉寂了好久，过去的一年 Project PAI 都做了哪些事情？项目方最近的工作计划是怎样的？会和 DeFi 以及 NFT 方向有结合吗？

答：2020年10月，PAI从传统的PoW共识区块链转换为新的PoW / PoS混合共识模型。PAI核心贡献者当前的主要重点是确保PAI区块链稳定可靠，以便PAI混合共识能够发展成为完全去中心化的网络。除了技术贡献外，这还包括获得更多的网络参与者以进一步使PAI区块链进一步去中心化。同时，正在开发基于PAI区块链的Catena NFT项目，该项目很快将支持PAI币并赋能PAI生态。

团队在持续跟进Defi领域的最新趋势，将会通过与其他项目合作的方式来参与Defi领域的创新。另外，我们在研究使PAI币跨链（如Ethereum, 火币生态链Heco, 币安智能链BSC等）的可能的技术方案，这使得PAI币在未来能够用于一些Defi场景。

【第二问】 Project PAI的NFT平台计划什么时候上线？与市面上其他NFT交易平台（如OpenSea，Rariable等）相比有什么优势？能否介绍一下PAI NFT项目的主要团队成员？

答：基于PAI区块链的Catena NFT平台目前可在 catenaart.com 上使用，目前处于原型测试阶段，已经允许人们在该平台上传自己的作品。PAI核心贡献者诚挚地欢迎您参与该产品的原型测试并提出任何建议或反馈。在完成原型测试后，我们会根据反馈进一步优化产品并完善用户体验设计，第一个正式版本预计于2021年上半年发布。

Cartena NFT是一个基于PAI区块链的完全去中心化的NFT交易平台。Cartena NFT的主要特色在于：

1. 完全去中心化的NFT交易市场，打通链上和链下：在Cartena NFT平台，您既可以交易NFT，也可以在交易现实商品的同时获得其在PAI区块链上的NFT，打通链上与链下。

2. 支持多种支付模式：Catena NFT平台将支持PAI币，主流加密货币（BTC, ETH等）以及信用卡支付。

3. 内置加密通讯系统，使得在NFT交易的过程中，买方和卖方可以进行沟通以保证交易的顺利进行。

4. 基于PAI PASS的身份认证系统，保证交易双方的真实性，并确保每笔交易的每个环节都在PAI区块链上可追溯。

欢迎您参与Cartena NFT平台的原型测试并在PAI论坛上分享您的想法！

测试链接：https://catenaart.com/

下面介绍一下Cartena NFT项目的核心开发者：

Alex Waters 先生

自比特币被发明以来，Alex Waters先生一直是比特币生态系统的早期成员，自2010年以来一直从事区块链技术的全职工作。他过去的项目包括与人共同创立并担任比特币支付公司Coin.co的首席执行官。创建了Coin Apex，这是最早的数字货币和区块链研究组织之一。他还曾在比特币核心开发开源项目BitInstant和itBit中担任过职务。

他致力于构建技术和创建利用分布式分类帐系统的产品，为当前的监管环境树立了高标准的基调。Alex被认为是该行业的宝贵资源，并因其对加密货币和区块链技术的见识而被许多银行、法律、教育和公共团体所利用，其中包括纽约联邦储备银行、OCC、FIRMA、票据交易所、纽约州律师协会、纽约大学对外关系委员会、国王学院、哥伦比亚大学和W3C等。他还曾在印刷，广播和电视等行业担任过专题报道，这些组织包括Coin Desk、《福布斯》、《财富》、NPR、Fox、American Banker、 Wired，Business Insider、BBC、VP、TechCrunch和Bloomberg等。

Mark Harvilla博士

Mark Harvilla博士于2010年获得了匹兹堡大学（Pitt）的学士学位，并于2014年获得了卡内基梅隆大学（CMU）的博士学位，是电气和计算机工程专业。在CMU博士学习期间，Harvilla博士专门从事自动语音识别（ASR）研究。Harvilla博士于2015年1月加入ObEN，成为其第一名员工，并于2017年成为Project PAI核心贡献者。此后，他在Project PAI的多个领域工作，目前主要负责区块链共识机制研究和区块链系统建设。目前，Mark Harvilla博士正在领导Project PAI的区块链研发工作。

第三问：PAI的PoUW是一个什么样的技术？计划什么时候推出？

答：Project PAI的有用工作量证明机制（PoUW，即Proof of Useful Work）是一个旨在使矿工能够在执行机器学习计算的同时验证PAI币交易的研究项目。PoUW的目的在于使用AI的计算来替代传统的PoW哈希运算，使得在区块链上的算力能够用于实际的AI应用，让这些算力变得”有用”。未来，这些算力不仅可以用于机器学习训练，还可以拓展到通用的链上计算，如链上数据分析、基于密码学的链上隐私计算（如零知识证明、多方安全计算）等。

PoUW是一个富有激情的以研究为导向的项目，由多个Project PAI核心贡献者共同完成。PoUW的测试网原计划于2021年下半年推出，由于技术研究的工作的前沿性和不确定性，以及Project PAI的其他产品规划，我们将尽力保障PoUW测试网的顺利推出。

最新的进展，可以查看PoUW项目的官网和Github代码库。

Project PAI的PoUW项目官网：

https://projectpai.com/pai-research/

PoUW项目的Github代码库：

https://github.com/projectpai/pouw-main-iteration

【第四问】 一直对PAI区块链的应用场景不是很明确，相对基于其他主流公链以金融为主打，PAI区块链又是怎样一个生态？

答：参照Project PAI的最初愿景（技术白皮书），PAI区块链从根本上包括三个模块：身份验证层，区块链层和数据层：

1. 身份验证层控制PAI生态系统中存在的关系。

2. 区块链层记录了网络交易以及对等参与的协议。

3. 数据层使用哈希引用对等地对加密数据进行索引。

从理论上讲，任何需要身份验证服务，交易服务或数据存储、共享服务（或您可以想象的更多）的组合的应用程序或用例都可以利用PAI区块链技术。当前，PAI区块链的具体示例是NFT交易平台Catena，可在 catenaart.com 上访问该平台。

感谢大家的提问，由于时间和篇幅关系，在这篇文章我们主要回答了大家最关心的几个方向，这些问题涉及到Project PAI产品和技术路线的基本信息。

其他的问题，我们会陆续在每周的PAI周报中放出，欢迎大家关注Project PAI的公众号和PAI Fans公众号，并随时跟踪项目的最新进展，感谢大家一直以来的支持！

Project PAI Announces Technical Progress, Catena NFT Platform is Coming Soon!

The annual PAI Day on March 14, 2021 came as usual. To thank PAI enthusiasts for their continued support, Project PAI core developers launched an AMA campaign through the community and gave millions of airdrop rewards back to PAI contributors and community members. The following are the selected AMA questions, enjoy:

Q: Why do I feel like the Project PAI Team has been quiet for a while? What has been done by Project PAI in the past year? What is the recent work plan done by Project PAI? Will there be plans to support DeFi and NFT?

A: In October 2020, PAI switched from a conventional PoW-style blockchain to a new PoW/PoS Hybrid Consensus model. The current primary focus of the PAI Core Contributors is to ensure that the PAI blockchain is stable and reliable, so that PAI Hybrid Consensus can thrive as a fully decentralized network In addition to technical contributions, this includes acquiring more network participants to further decentralize the blockchain, and providing support to the Catena NFT project, which will soon support PAI Coins and enable Project PAI ecosystem.

The team is following up on the trends in the Defi world, and will participate in the innovation of the Defi world by cooperating with other projects. In addition, we are studying possible technical solutions to enable cross-chain features for PAI coins (such as Ethereum, Heco, BSC, etc.), which enables PAI coins to be used in some Defi applications in the future.

Q: When will Project PAI’s NFT platform go online? Compared with other NFT trading platforms on the market (such as OpenSea, Rariable, etc.), what are the advantages？Can you introduce the main team members of the PAI NFT project?

A: The Catena NFT platform based on the PAI blockchain is currently available on catenaart.com and is currently in the public prototype testing stage, allowing people to upload their own arts on the platform. The core contributors of PAI sincerely welcome you to participate in the prototype test of the product and provide any suggestions or feedback. After completing the prototype test, we will further optimize the product and improve the user experience design based on the feedback. The first official version is expected to be released in Q2 of 2021.

Cartena NFT is a completely decentralized art trading platform based on the PAI blockchain. The main features of Cartena NFT are:

1. Fully decentralized NFT trading market, connecting on-chain and off-chain: On Cartena NFT platform, you not only trade NFT, but also obtain its NFT on the PAI blockchain while trading real arts, which is both on-chain and off-chain.

2. Support multiple payment channels: Catena NFT platform will support PAI coins, mainstream cryptocurrencies (BTC, ETH, etc.) and credit card payments.

3. The built-in encrypted communication system allows the buyer and seller to communicate during the NFT transactions to ensure the progress of each transaction.

4. The identity authentication system based on PAI PASS ensures the authenticity of both parties in the market. Users can track each step of each transaction on the PAI blockchain.

Welcome to participate in the prototype test of Cartena NFT platform and give feedback on the PAI forum.

Test url: https://catenaart.com/

Here are the core members of our Cartena NFT team:

Alex Waters:

Alex Waters has been an early member of the Bitcoin ecosystem since its inception and has worked full-time on blockchain technology since 2010. His past projects include co-founding and serving as the CEO for Coin.co, a bitcoin payments company, as well as creating Coin Apex, one of the first digital currency and blockchain research organizations. He has also held roles at the Bitcoin core development open source project, BitInstant, and itBit.

Committed to building technology and creating products that utilize distributed ledger systems, he has helped set the tone for high standards regarding the current regulatory landscape. Alex is considered a valuable resource to the industry and is utilized by many banking, legal, educational, and public groups for his insight on cryptocurrency and blockchain technology, including the NY Federal Reserve, OCC, FIRMA, The Clearing House, NYS Bar Association, The Council on Foreign Relations, NYU, The King’s College, Columbia University, and the W3C.. He has also been featured in print, radio, and television by organizations such as Coin Desk, Forbes, Fortune, NPR, Fox, American Banker, Wired, Business Insider, BBC, Vice, TechCrunch, and Bloomberg.

Mark Harvilla

Dr. Mark Harvilla earned his Bachelor’s Degree from the University of Pittsburgh (Pitt) in 2010 and his PhD from Carnegie Mellon University (CMU) in 2014, all in Electrical and Computer Engineering. During his doctoral studies at CMU, Dr. Harvilla specialized in Automatic Speech Recognition (ASR) research. Dr. Harvilla joined ObEN as its first employee in January 2015 and became a Project PAI Core Contributor since 2017. He has since worked in a variety of areas at Project PAI, including blockchain consensus mechanism research and blockchain system construction. He currently leads the technology development at Project PAI.

Q: What is PAI’s PoUW? When is it planned to launch?

A: Project PAI’s Proof of Useful Work (PoUW, Proof of Useful Work) is a research project designed to enable miners to perform machine learning calculations while verifying PAI currency transactions. The purpose of PoUW is to use AI calculations to replace traditional PoW hashing operations, so that the computing power on the blockchain can be used for actual AI applications, making these computing powers “useful”. In the future, these computing powers can not only be used for machine learning training, but can also be extended to general-purpose on-chain computing, such as on-chain data analysis, cryptographic-based on-chain privacy computing (such as zero-knowledge proof, secure multi-party computation), etc.

PoUW is a passionate research-oriented project, completed by multiple core contributors to Project PAI. The PoUW testnet was originally planned to be launched in the second half of 2021. Due to the cutting-edge and uncertainty of technical research and other product plans of Project PAI, we will try our best to ensure the launch of the PoUW testnet.

For the latest progress, you can check the official website of the PoUW project and the Github code base

The official website of Project PAI’s PoUW project:

https://projectpai.com/pai-research/

Github repo of PoUW project:

https://github.com/projectpai/pouw-main-iteration

Q: The current applications and use cases for PAI seem unclear to me. What does PAI’s economy offer compared to other chains that focus on use cases like finance?

A: Referencing the original vision (tech white paper), the PAI Blockchain fundamentally comprises three modules: Authentication layer, Blockchain layer, and Data layer:

1.The Authentication layer controls relationships that exist in the PAI ecosystem.

2.The Blockchain layer houses a record of network transactions as well as protocols for peer-to-peer engagement.

3.The Data layer indexes encrypted data, peer-to-peer, with hashed references.

Theoretically, any applications or use cases which require one or a combination of authentication services, transactional services, or data storage and sharing services (which, as you can imagine, is quite a lot) can leverage PAI blockchain technology. Currently, the most concrete example of a PAI use case is the NFT art platform, Catena, which is accessible at catenaart.com.

Thank you for your questions. Due to time and space, in this article we mainly answer the most concerned questions. These questions involve the basic information of Project PAI products and technical roadmap.

We will release other questions in the PAI weekly newsletter one by one. Welcome everyone to pay attention to the wechat public account of Project PAI and PAI Fans, and keep track of the latest progress of the project. Thank you for your continued support!

来源：PAI