1.Add xDai RPC in Metamask
Network Name: xDai
RPC UPL: https://xdai.poanetwork.dev/
Chain ID: 100
Currency Symbol: xDai
2.Open the URL received in the mail in your browser(http://POAP.xyz/claim/xxxxxx)，Copy and paste the metamask account address, click Mint POAP Token
3.Get custom POAP NFTs for the first Global Metaverse Bootcamp
1996年的时候，比尔·盖茨曾发表一篇题为《内容为王》的文章，他写到:“互联网令人兴奋的事情之一是，任何人只要有一台个人电脑和一个调制解调器，就可以发布他们创作的任何内容。”
今天来看，盖茨的分析确实是走在时代之前的。诚然，互联网让几乎所有人都有可能在网上发布内容，但同样不可否认的是，目前，作为一名内容创作者价值完全回归到个人无疑是难以实现的。
前些日子，相信大家的朋友圈都被Sky9 Capital合伙人牛凤轩的《谈Web3重塑数据价值》刷屏了，大家也都对Web3有了更新的认知。
在Web2.0里，你的数据有价值，但不属于你，价值也不分给你。
链上数据是一座金矿，应用越多，数据越多，金矿越大。
在Web3.0里，你的价值行为终将获得回馈，价值的载体是你的数据，也属于你自己。
实际上Web3的时代，当价值回归到创作者也就是我们自己本身的时候，更多更好的内容才有机会被创作与展示。
因为在这一时代，无论你是艺术家、开发者还是拥有其他一技之长的人，都可以被统称为创作者，而创作者经济这一领域具有巨大的发展空间，新的商业模式和技术有望开启一种经济机会，为艺术家和创作者带来一个真正的创作黄金时代。
Web2到Web3的转变，是从注意力经济到所有权经济的转变，Web3时代的权力和所有权都将像创作者和用户倾斜。
这种情况将主要通过四种方式发生：
1.引入数字稀缺性，恢复创作者的定价权。
2.让支持创作者成为一种投资行为，而不仅仅是利他行为。
3.引入新的可编程经济模型，将财富分散到整个创作者领域。
4.最重要的是，通过为创作者创造途径，让创作者不仅拥有自己创作的内容，还拥有平台本身。
讨论：
1.创作者经济时代的来临将改变现有经济模式，如何才能抓住机遇成为第一批吃螃蟹的人？
2.好的工具将有助于创作，请分享一下目前使用过好用的创作工具。
阅读参考：
3.从创作者的不同等级，看Web3世界中创作者经济的痛点与机遇
欢迎大家加入并参与我们的话题讨论会！
From 1991 to 2021, the Web has undergone two major iterations, namely Web1.0 and Web2.0.The Web1.0 era lasted approximately from 1991 to 2004. At this time, website creation is usually provided by the developers who build the website, and what the public can consume is mainly static content.
What Web2.0 brings to the public is an interactive experience and social network. Anyone can easily become a creator in the Web2.0 era.
The wheel of history is rolling forward, and the development of blockchain technology has laid a solid foundation for the arrival of the Web3.0 era. At present, the paradigm shift from the Internet to the blockchain is the fundamental characteristic of the Web3.0 era.
Therefore, many of the highlights of Web 3.0 in the future are a reflection of the characteristics of blockchain technology. Of course, blockchain is not a single technology, but a combination of technologies such as applied cryptography, distributed networks, and databases.
So in the Web3.0 era, what new changes can we expect?
1) Data ownership: The appearance and confirmation of digital identities provide a basis for the redistribution of ownership and control of data (including digital goods, digital rights, and interests). Web3.0 data belongs to users
2) Interactive objects: If the Web2.0 era is the Internet of Information, then the blockchain opens the Internet of Value in the Web3.0 era. Because of this, the operation of the virtual world and meta-universe has the underlying economic system and value interaction.
3) Monetization method: From flow monetization to data monetization. With the previous data confirmation, data usage records will generate corresponding records on the chain, and the data owner will obtain benefits from the process of data processing and data monetization (digital commodity transactions in the form of NFT can also obtain continuous benefits).
4) Business model: From platform-based business to ecological business. In the Web3.0 era, everyone can create their own dApp, and the business model will change from a platform-led economy based on individual platforms to a large-scale collaborative distributed business ecosystem.
5) Organizational management: The emergence of DAO blurs the boundaries and organizational methods of the organization, and the decision-making will come from the consensus of the community; at the same time, smart contracts will digitize and code the rules and regulations, reducing the interference of human factors.
The emergence of Web3.0 will correct the inherent deficiencies of the Internet model in the Web2.0 era, such as advertising, data, and privacy security issues. On the other hand, it will also leave countless applications with the original branding of the Web3.0 era, such as creators. Economy and so on.
I believe that as the Web3 ecosystem continues to grow, there will be more new applications and new gameplay.
Discussion
What do you think is the most essential difference between Web3.0 and Web2.0?
In your opinion, what qualities should we expect in Web3.0?
What kind of network ecology do you think Web3.0 will bring?
Further reading
Welcome to join our discussion.
从1991年到2021年，Web发生了两次重大迭代，分别是Web1.0和Web2.0。Web1.0时代大约从1991年持续到2004年，这时候的网站创作通常是由构建网站的开发人员提供的，大众能消费的主要是静态内容。
而Web2.0给大众带来的，更多的是交互式体验和社交网络，任何人都可以在Web2.0时代轻松成为创作者。
历史的车轮是向前滚动的，区块链技术的发展给Web3.0时代的到来打下了坚实基础，目前看来，从互联网到区块链的范式转移是Web3.0时代的根本特性。因而，未来Web3.0的诸多亮点都是区块链技术特性的反映，当然区块链并非单一技术，而是应用密码学、分布式网络、数据库等技术的组合。
那么Web3.0时代，我们可以期待哪些新变化呢？
1）数据所有权： 数字身份的出现和确认，为数据（包括数字商品、数字权益）所有权和控制权的重新分配提供依据，Web3.0数据属于用户
2）交互对象： 如果说Web2.0时代是信息互联网，那么区块链开启了Web3.0时代的价值互联网。正因为此，虚拟世界、元宇宙的运行才有了底层经济系统和价值交互。
3）变现途径： 从流量变现到数据变现。有了前面的数据确权，数据使用记录都会在链上生成对应的记录，数据所有方将从数据处理和数据变现的过程中获得收益（以NFT形式的数字商品交易还可获得持续性收益）。
4）商业模式： 从平台化商业到生态化商业。在Web3.0时代，每个人都可能打造属于自己的dApp，商业模式也将从个人依托平台的平台主导型经济，变为大规模协作的分布式商业生态。
5）组织管理： DAO的出现模糊了组织的边界和组织方式，决策的达成将来源于社区共识；同时，智能合约将规章制度数字化、代码化，降低了人为因素的干扰。
Web3.0的出现将修正Web2.0时代互联网模式的内生性缺陷，诸如广告、数据和隐私安全等问题，另一方面也将留下无数带着Web3.0时代原创烙印的应用，比如创作者经济等等。
相信随着Web3生态的不断壮大，还会有更多新应用和新玩法的出现。
讨论
1.你认为Web3.0与Web2.0最本质的区别是什么？
2.你认为Web3.0中应该有哪些我们期待的特质？
3.你认为Web3.0将带来怎样的网络生态？
阅读参考
欢迎加入我们的讨论~
First, you can learn some Dapp development process
The Complete Guide to Full Stack Ethereum Development - DEV Community
Front End
If your team lacks a UI designer, you can call directly from the ready-made templates on the website, so that the front-end engineer can also be responsible for part of the UI work.
HTML/CSS/javascript: Learn web development | MDN (mozilla.org)
UI(ant design): Ant Design of React - Ant Design
Smart Contract
Solidity：Solidity — Solidity 0.8.7 documentation (soliditylang.org)
Solidity example: https://solidity-by-example.org/
Hardhat Overview | Hardhat | Ethereum development environment for professionals by Nomic Labs
Waffle: Waffle Documentation — waffle documentation (ethereum-waffle.readthedocs.io)
Smart Contract Upgrades: The State of Smart Contract Upgrades - OpenZeppelin blog
Pages Deployment
When you are trading on Ethereum, you must have these questions when faced with a long list of garbled addresses. Is the recipient address correct? Do I need to check it again? What if the transfer is wrong? ENS can effectively solve the above problems.
ENS seems to be very similar to DNS (Domain Name System). DNS associates readable website domain names with IP addresses. The IP address is composed of a string of numbers and ".". For example, the IP address of the website "taobao.com" is 140.205.220.96. It is difficult for us to remember its IP address, but it is easy for us to remember the domain name. The function of DNS is to associate an IP address with a human-readable domain name. We can directly enter the DNS address in the search bar to get the relevant website.
The role of ENS (Ethereum Domain Name System) is similar to DNS. It can convert a long list of addresses into readable eth addresses that users apply for, such as directly linking vitalik.eth (0xd8dA...6045).
At the same time, ENS also has a reverse analysis function, that is, (0xd8dA...6045) can also be associated with vitalik.eth.ENS provides a safer and decentralized way, improves user experience, reduces the risk of transfer errors, and makes transactions easier.In addition, the ENS address is unique, and it is also a non-fungible token (NFT). We can buy it on ENS Official Website or go to Opensea to bid and trade.
ENS officially announced the airdrop on November 2nd, which undoubtedly gave a resounding shot to the domain name track. DAS, FIO and other projects have also attracted more attention due to their stronger interoperability and richer functionality.
In the era of web3.0, whether it is a unique show or a hundred flowers blooming, there must be a decentralized domain name and account system like ENS.
Need such tools to host applications, websites and user identities,
However, these current projects are still in a very early stage of exploration, and there is still much room for improvement in the future in terms of protocol integration, user experience, and access to the Web2 world.
Discussion
1.Are you optimistic about the domain name track?
2.Share your sense of use of decentralized domain name systems such as ENS, DAS, and FIO.
Further reading
Welcome to discuss here!
大家在以太坊交易时，面对一长串乱码一样的地址肯定都困惑过，收件人地址正确吗？需要再核对一遍吗？万一转账错误怎么办？ENS就能够有效解决上述问题。
看到ENS，免不了联想到DNS（域名系统），DNS是将可读网站域名与IP地址相关联起来。IP地址是由一串数字和「.」组成，如网站“taobao.com”的IP地址是140.205.220.96，我们很难记住它的IP地址，但我们很容易就记住域名。DNS的功能就是将IP地址与人类可读的域名关联起来，我们直接在搜索栏输入DNS地址即可获得相关网站。
ENS（以太坊域名系统）的作用与DNS类似，它能将一长串地址转换成用户自己申请的可读eth地址，如：将vitalik.eth直接关联（0xd8dA...6045），同时ENS还有反向解析功能，即（0xd8dA...6045）也能关联vitalik.eth。ENS提供了一种更安全且去中心化的方式，改善了用户体验，能够降低转账出错的风险，使得交易更加简单。此外，ENS地址是唯一的，也是非同质化代币（NFT），我们可以在ENS官网购买，也可以去Opensea上竞价交易。
11月2日，ENS官宣空投，这无疑给域名赛道打出了响亮的一枪，DAS、FIO等项目也因其更强的互操作、更丰富的功能性纷纷出圈。
相信在web3.0时代，不论是一只独秀还是百花齐放，必定有像ENS这样的去中心化域名和账户体系，去承载应用、网站和用户身份，但目前的这些项目还是处于非常早期的探索阶段，在协议集成、用户体验、与 Web2 世界的接入，未来还有很多改进空间。
讨论
1.你看好域名赛道吗？
2.分享你对ENS、DAS、FIO等去中心化域名系统的使用感。
参考与延申
1.ENS 空投在即，为什么说去中心化域名及账户系统对 Web3 至关重要？
欢迎加入我们的讨论~
Since the 2017 Segregated Witness upgrade, Bitcoin will usher in another major upgrade in the near future, which is the Taproot upgrade.
Taproot was first proposed by Bitcoin Core contributor Gregory Maxwell in 2018. It is a technology that improves the functionality of Bitcoin scripts and will solve the simple execution problem of complex transactions (multi-signature, time lock).At the same time, it can also enhance the scalability, privacy and flexibility of Bitcoin.
The Taproot upgrade will implement BIP-340, BIP-341 and BIP-342 Bitcoin Improvement Proposals (BIPs), which mainly include the following three technologies: Schnorr signature, Merkel Abstract Syntax Tree (MAST) and Pay-to-ScriptHash (P2SH) .
Let's take a look at the specific content of the Taproot upgrade.
We all know that Bitcoin currently supports elliptic curve cryptographic signatures (ECDSA), which allows users to generate public and private keys. It also allows users to sign transactions with a private key when only the public key is displayed.This algorithm is very common and very easy to use.The algorithm also allows the use of more than 1 secret key to sign a transaction, but this will reduce privacy. At the same time, the transaction will occupy more block space, which will result in a smaller number of transactions that can be accommodated in a single block, and users must pay much more for this.
The Schnnorr signature was added to the BIP-340 proposal, which allows for key aggregation. In other words, the Schnnorr signature will aggregate all the secret keys involved in a transaction into a single secret key.This means that only one secret key exposed will not cause privacy issues in multi-signature transactions.This also means that the size of the transaction is smaller, allowing more transactions in a single block. As the transaction size has become smaller, the transaction cost has also become lower.
Schnorr signatures can combine multiple signatures into a single signature.Therefore, after Taproot goes online, the cost of opening or closing the lightning network channel will be lower.This makes the Lightning Network more private and cheaper to use.
The BIP-341 proposal will use Schnnorr signatures to create MASTs (Merkle Abstract Syntax Trees), and MASTs will use Merkle Trees to make smart contracts more private and secure.When BIP-341 goes online, only the condition met by the smart contract will be revealed, while other unsatisfied conditions will be hidden.Merkel Abstract Syntax Tree (MAST) is proposed to be introduced into the Bitcoin blockchain, which can reduce the volume of BTC transactions, so that the recipient does not need to add lengthy scripts to the transaction.
This will make Bitcoin smart contracts more secure because there are fewer data points that hackers can use.The hacker will not know all the other conditions in the smart contract, but only one condition. Along this path, we will see a decrease in Bitcoin smart contract attacks and more privacy for those who use these contracts.
The BIP-342 proposal introduces a feature called Tapscript, which is a scripting language.Tapscript improves the signature hash as a supplement to the Taproot function and Schnnorr signature. As an upgraded version of the Bitcoin programming language (script), Tapscript is easier to add new features and provides batch verification (batch verifiability) based on Schnorr signatures.The proposal also removed the 10,000 byte size limit of Bitcoin scripts, thus making Bitcoin smart contracts more flexible and free.This gives developers more freedom to create smart contracts that are more exciting and have useful features.BIP-342 will also implement a function called "tagged public keys", which will make it easier for Bitcoin to be upgraded through a soft fork, and prepare for the future and development of Bitcoin.
Discussion
1.What is the importance of Taproot?
2.What impact does Taproot have on miners?
Reading & Referrence
1.The Bitcoin Taproot upgrade is coming soon. What important content does it contain?
2.Bitcoin upgrade proposal Taproot technical interpretation
3.Interpretation of the three proposals and importance of Bitcoin Taproot upgrade
4.Major Bitcoin upgrade (Tapscript [BIP342], Taproot [BIP341], Schnorr signature [BIP340]
Welcome to discuss here!
比特币预计将在2021年11月15日迎来自SegWit (隔离见证) 升级以来的又一次重大升级——Taproot升级。
Taproot 由 比特币核心贡献者 Gregory Maxwell 于2018年首次提出，是一种提升比特币脚本功能的技术，将解决复杂交易（多签、时间锁）的简单执行问题，同时也能增强比特币的可扩展性、隐私性和灵活性。
Taproot 升级将实施 BIP-340 、BIP-341 和 BIP-342 比特币改进提案（BIPs），主要包括Schnorr 签名、默克尔抽象语法树（MAST）以及支付脚本哈希（P2SH）这三个重要的技术变化。
让我们来了解一下 Taproot 升级的具体内容。
我们都知道，当前比特币支持的是椭圆曲线的密码学签名（ECDSA），允许用户生成公钥和私钥，并允许用户在仅显示公钥的情况下使用私钥对交易进行签名。这种算法是很常见的，也非常好用。该算法还允许使用超过 1 个秘钥来签署一笔交易，但这会降低隐私性，同时还会让该笔交易占用更多的区块空间，导致在单个区块中能够容纳的交易数量更少，用户也必须为此付出多得多的手续费。
BIP-340 提案中加入了Schnnorr签名，允许实现秘钥聚合(key aggregation)。也就是说，Schnnorr签名 将把 1 笔交易中涉及的所有秘钥聚合成单个秘钥。这意味着，只有 1 个秘钥暴露不会引起多签交易中的隐私问题；这也意味着这笔交易的大小更小了，从而允许单个区块中能容纳更多的交易。由于交易大小变小了，交易的成本也变低了。
Schnorr 签名可以将多个签名合并成单个签名。因而Taproot上线后，开启或关闭闪电网络通道时的成本将会更低，这使得闪电网络更具隐私性，使用成本也更低。
BIP-341 提案将使用 Schnnorr 签名来创建MASTs (默克尔抽象语法树)，MASTs 将使用默克尔树 (Merkle Trees) 来使智能合约更加隐私和安全。当 BIP-341 上线时，只有被智能合约满足的那个条件会被揭示，而其他未满足的条件将被隐藏。默克尔抽象语法树（MAST）被提议引入比特币区块链，可以减少 BTC 交易的体积，使得接收方无需在交易中附加冗长的脚本。
这将使比特币智能合约更加安全，因为黑客能够使用的数据点更少了。黑客不会知道智能合约中的所有其他条件，而是只会知道1个条件。沿着这条路走下去，我们将会看到比特币智能合约攻击的减少，以及给那些使用这些合约的人更多的隐私性。
BIP-342 提案引入一个称为 Tapscript 的特性，这是一种脚本语言。Tapscript 通过改进签名哈希来作为 Taproot 功能和 Schnnorr 签名的补充。作为比特币编程语言（脚本）的升级版，Tapscript更容易添加新功能，且提供基于Schnorr签名的批量验证（batch verifiability）。该提案还取消了比特币脚本 10,000 字节大小的限制，从而使比特币智能合约更具灵活性和自由。这给了开发者更多的自由来创建更令人兴奋和具备有用功能的智能合约。BIP-342 还将实现一个称为「tagged public keys」的功能，将使比特币更容易通过软分叉进行升级，为比特币的未来和发展做好准备。
讨论
1.Taproot升级意味着什么？
2.Taproot有哪些重要性？
3.Taproot对矿工有什么影响？
参考引用
1.比特币 Taproot 升级即将到来，它包含了哪些重要内容？
4. Bitcoin重大升级（Tapscript [BIP342]，Taproot [BIP341]，Schnorr签名[BIP340]）
欢迎来参加我们的讨论会~
Ethereum cannot meet the needs of all users due to its own scalability issues. Blockchain developers have also devoted themselves to the research and creation of other public chains. At present, an environment with more than 100 active public blockchains has been formed.Among them, public chains such as Polkadot, Cosmos, and Solana have their own user ecology, applications, and security models.
While forming this kind of multi-chain market structure, inevitably, it is necessary to realize the interoperability between different networks.Many developers are also aware of this, so as the multi-chain environment is gradually improved, the concept of "bridge" has also entered the public eye."Bridge" can unify the fragmented public chain structure, break the island effect of each public chain, and turn the public chain environment into an interconnected whole.
The specific role of "Bridge":
[1]. Improve the productivity and utility of existing encrypted assets
[2]. Provide more powerful product functions for existing agreements
[3]. Unlock new features and use cases for users and developers
At an abstract level, a "bridge" can be defined as a system that transmits information (assets, contract calls, proofs, or status) between two or more blockchains.The design module of "Bridge" includes monitoring, information transmission/relay, consensus, and signature.
Type of "Bridge":
[1]. Asset-specific type: The sole purpose of this type of "bridge" is to access a specific asset from an external chain.
[2]. Chain-specific type: This type of "bridge" connects two different blockchain networks, and usually supports the simple operation of locking & unlocking Tokens on the source chain and casting any "packaged" assets on the target chain.
[3]. Application-specific type: An application provides access to two or more blockchain networks, but it can only be used within the application.
[4]. Universal: A protocol designed specifically for the transmission of information across multiple chains.
According to different verification mechanisms for cross-chain transactions, the design types of "bridges" are as follows:
[1]. External Verifier & Federalism
Usually there is a group of validators that monitor the "mailbox" addresses on the source chain and perform operations on the target chain after they reach a consensus.
The transfer of assets is usually done by locking the assets in the mailbox and casting the same amount of assets on the target chain. These verifiers usually need to pledge a separate token to ensure security.
[2]. Light client & relay
Participants monitor events on the source chain and generate encrypted proofs of past events recorded on the chain.
Then, these proofs and the block header are forwarded to the contract on the target chain (ie, "light client"), and then the target chain will verify whether an event is recorded, and perform operations after verification.
[3]. Liquidity Network
This design is similar to a peer-to-peer network, where each node acts as a "router", holding the "inventory" of the source chain and target chain assets.
Discussion
Do you think there is the best "bridge" design? Please leave your opinion.
Please talk about the "bridge" you know.
Read reference
2.In the multi-chain era, how to choose the bridge that suits you best?
3.Multi-chain coexistence, cross-chain becomes rigid demand
4.Cross-chain bridge helps you to travel freely in the multi-chain era
Welcome to discuss here!
以太坊因为它本身的扩展性问题不能满足所有用户的需求，区块链的开发者们就开始致力于其他公链的研究与创造，目前已经形成了一个超100条活跃公链的区块链环境，其中Polkadot、Cosmos、Solana等公链都有了自己的用户生态、应用程序、安全模型等。
在形成这种多链市场结构的同时，不可避免地，就需要实现不同网络之间的互操作。许多开发者也意识到了这一点，因而在逐渐完善多链环境的时候，「桥」这一理念也走入大众视野，「桥」可以将碎片化的公链格局统一起来，打破各公链的孤岛效应，将公链环境变成一个互联互通的整体。
「桥」的具体作用：
[1].提高现有加密资产的生产率和效用性
[2].为现有协议提供更强大的产品功能
[3].为用户和开发者解锁新的功能和用例
抽象层面上，「桥」可以定义为在两个或多个区块链之间传输信息（资产、合约调用、证明或状态）的系统。「桥」的设计权衡中包含监控、信息传递/中继、共识、签名这几部分。
「桥」的类型：
[1].资产专用型：这类「桥」的唯一的目的是从外部链访问某种特定的资产。
[2].链专用型：这类「桥」连接两个不同的区块链网络，通常支持在源链上锁定 & 解锁 Tokens 并在目标链上铸造任何“包装的”资产的简单操作。
[3].应用专用型：一个应用提供对两个或多个区块链网络的访问，但仅限在该应用内使用。
[4].通用型：一个专门为跨多条链传输信息而设计的协议。
根据不同验证跨链交易的机制，「桥」的设计类型有以下几种：
[1].外部验证者 & 联邦制
通常有一组验证者监视源链上的“邮箱”地址，并在它们达成共识后在目标链上执行操作。资产的转移通常是通过在邮箱中锁定资产并在目标链上铸造等量的资产来完成的。这些验证者通常需要质押一种单独的 Token，以保证安全性。
[2].轻客户端 & 中继
参与者监视源链上的事件，并生成关于该链上记录的过去事件的加密证明。然后，这些证明和区块头一起被转发到目标链上的合约 (即“轻客户端”)，然后目标链将验证某个事件是否被记录，并在验证之后执行操作。
[3].流动性网络
这种设计类似于点对点网络，其中每个节点都充当一个“路由器”，持有源链和目标链资产的“库存”。
讨论
1.你认为存在最佳的「桥」设计吗？请谈谈你的见解。
2.请谈一谈你了解的「桥」。
阅读参考
欢迎加入我们的讨论~
At present, Optimism and Arbitrum have low gas costs, good security, and good user experience, so they are favored by most users in a group of Layer 2 solutions.Although the ZK rollup solution is more secure and has a shorter exit period, it has always been regarded as a potential stock because it uses zero-knowledge proof technology and does not support EVM.
On October 13th, Ethereum Layer 2 network developer Matter Labs announced the launch of the first migrated zksync 2.0 test application UniSync, which means that zkEVM has been fully compatible with Solidity, and existing Ethereum applications will be seamlessly migrated to Zksync 2.0 Layer 2 network.
What's zkEVM？
zkEVM is a virtual machine that executes smart contracts in a way that is compatible with zero-knowledge proof calculations. This is the key to building an EVM-compatible ZK rollup two-layer network, while retaining the actual code and related knowledge.zkEVM retains the EVM semantics, but it is also friendly to ZK, and it also uses a traditional CPU architecture.
The launch of zkEVM represents an important turning point in encryption technology. In the past year, the development of the entire zero-knowledge proof ecosystem has exceeded the expectations of many experts. Now Solidity programmers can access the unparalleled scalability of zero-knowledge proof. Security and UX advantages.So this means that zksync 2.0 supports smart contracts, which will also greatly reduce developers' development costs, while users can also enjoy the expansion advantages brought by ZK Rollup technology.
Compared with Optimism and Arbitrum, what are the specific advantages of zksync 2.0?
1) Higher security: ZK rollup eliminates the dependence on observers and replaces the economic security of game theory with cryptographic security. Users trust pure mathematics instead of encouraging participants.
2) Higher capital efficiency: In the OR scheme, any asset extraction takes a long time (best case: 1 week), this is a safety parameter, shortening it will have an impact on safety. The waiting time of ZK rollup is very short. There are currently some cross-chain bridges that can help OR solve the withdrawal problem, but it is still unable to achieve large-scale transfers because the liquidity provider (LP) is unlikely to let so many funds idle.
3) NFT user experience will be better: In the OR scheme, the extraction of NFT cannot be speeded up (the LP solution is not applicable because NFT is the only one). Therefore, to extract NFT, the OR user actually has to wait 1 week or longer.
4) Lower transaction costs: ZK Rollup is cheaper for most popular encryption use cases because it requires the least amount of data published on the chain (no signatures and transaction parameters). In addition, ZKSync 2.0 will have an extension called zkPorter, which provides a fixed transaction fee of 1-3 cents by moving data out of the blockchain.
Discussion
1.Talk about your understanding of the expansion plan
2.What do you think are the disadvantages of zksync 2.0?
Read reference
1.Matter Labs migrates Uniswap V2 smart contracts and front-end to zkSync 2.0 testnet
2.zkEVM is fully compatible with Solidity. Is zksync 2.0 coming?
3.An article exploring zkEVM: the key to the expansion plan of Ethereum
Welcome to discuss here!
目前，Optimism和Arbitrum凭借其低gas、安全性好、用户体验佳的优势在一众Layer2解决方案中获得多数用户的青睐，而ZK rollup方案虽然安全性更高、退出期更短，但由于采用了零知识证明技术，且不支持EVM，因而此前一直被看成是潜力股。
10月13日，以太坊Layer 2网络开发商Matter Labs宣布推出首个迁移的zksync 2.0测试应用UniSync，这意味着zkEVM已经实现对Solidity的完全兼容，现有的以太坊应用将可以无缝迁移至zksync 2.0二层网络。
什么是zkEVM？
zkEVM 是一种以兼容零知识证明计算的方式执行智能合约的虚拟机，这是构建与 EVM 兼容的ZK rollup二层网络的关键，同时能够保留经实战测试的代码及相关知识。zkEVM 保留了 EVM 语义，但它对ZK也是友好的，它还采用了传统的 CPU 架构。
zkEVM 的推出代表了加密技术的一个重要转折点，在过去的一年里，整个零知识证明生态系统的发展已超出了很多专家的预期，现在Solidity 程序员可以访问零知识证明的无与伦比的扩展性、安全性和 UX 优势。那么这意味着，zksync 2.0支持智能合约，也将大大降低开发者的开发成本，同时用户还能享受到ZK Rollup技术带来的扩展优势。
与Optimism和Arbitrum相比，zksync 2.0具体有哪些优势呢？
1）安全性更高：ZK rollup消除了对观察者的依赖，用密码学安全取代了博弈论的经济安全，用户信任的是纯数学，而不是去激励参与者。
2）更高的资本效率：在OR方案中，任何资产的提取都需要很长时间（最佳情况：1周），这是一个安全参数，缩短它会对安全性产生影响，而ZK rollup的等待时间是非常短的。目前有一些跨链桥可以帮助OR解决提款问题，但仍无法实现大规模的转账，因为流动性提供者（LP）不太可能让那么多资金闲置。
3）NFT用户体验会更佳：在OR方案中，NFT的提取不能加快（LP解决方案不适用，因为NFT是唯一的），因此，要提取NFT，OR用户实际上必须要等待1周或更长的时间。
4）交易成本更低：ZK Rollup对于大多数流行的加密用例来说更便宜，因为它需要在链上发布的数据量最少（没有签名和交易参数）。此外，ZKSync 2.0将有一个名为zkPorter的扩展，它通过将数据移出区块链以提供1-3美分的固定交易费用。
讨论
1.谈谈你对扩容方案的了解
2.你认为zksync 2.0有哪些缺点呢？
阅读参考
1.Matter Labs 将 Uniswap V2 智能合约和前端迁移至 zkSync 2.0 测试网
2.zkEVM实现完全兼容Solidity，zksync 2.0要来了？
欢迎大家加入我们的话题讨论会参与讨论~
Matrix World is a 3D programmable multi-chain metaverse promoted by Matrix Lab and WhiteMatrix. Unlike other previous blockchain games, Matrix World tries to build a Turing-complete immersive metaverse. Users can create and experience in Matrix World with a lower marginal cost.Also，beacons will be provided for our MatrixWorld, and code is key to agglomerating the multiverse with the purpose of ultimately combining them into a metaverse entity. Matrix World offer user a metaspace capable of creating AI Generate Contents(AIGC) and User Generate Contents(UGC) through a 3D low code framework.
Referral Contest
At present, Matrix World has released a referral contest. After completing the account registration, you can forward the link and recommend it to other blockchain game enthusiasts to participate in the registration.The more users you recommended to register for Matrix World, the higher you will rank. This event ends on October 18th, the top 200 players in the final cumulative ranking will receive a pre-sale metaspace in Matrix World as a reward.
NFT Airdrops
Matrix World is a multi-elements synthetic world. In order to reward users, Matrix World will offer pecial NFT airdrops for each player.
Airdrop for Ethereum Users
We will provide free airdrops to owners who have collected the NFT collections listed above. **[Please note: multiple NFTs in the same set are counted only once, that is, each set can only get one airdrop NFT.]**For instance, If one user has 8 different sets of NFTs, then he will get 8 airdrops NFTs.
Airdrop for Flow Users
On Oct15, MatrixWorld will offer free NFT airdrops in Flow Fest Activity, Every festival attendee will have the opportunity to redeem one Mystery Box. Once Users open the Mystery box, each user will receive their NFTs directly to their Blocto wallet or any FCL compatible non-custodial wallet.
Airdrop for ChainIDE Users
ChainIDE users who registered before October 18th and created a project with ChainIDE (You will have to ensure that the email address you use in Matrix registration is the same as the ChainIDE account’s email).
Users who want to get NFT airdrops must register on the Matrix website with the same wallet holding listed NFTs before the pre-sale starts. The snapshot will be taken right after the early access closes.
Matrix World will release the pre-sale application in mid-October and start the qualification review process at the same time. Welcome everyone to follow the Matrix official website and discord community for more details.
More about Matrix World
2.Matrix World discord community
Matrix World是Matrix Lab与纯白矩阵合作推进的一款3D可编程的多链元宇宙，与以往其他链游不同的是，Matrix World试图构建一个图灵完备的沉浸式元宇宙，用户可以在Matrix World中用更低的边际成本进行创造与体验。Matrix World为用户提供的元宇宙空间，可以实现3D低代码的AI Generate Contents(AIGC) 与User Generate Contents(UGC)创造。此外，Matrix World能够为元宇宙世界提供信标，通过代码融合多元宇宙空间，为元宇宙的创新提供丰富的场景和合作资源。
目前，Matrix World已经开启了推荐注册竞赛，完成账户注册后，可以将链接转发推荐给其他链游爱好者参与注册，推荐越多的用户注册Matrix World，排名越靠前，本活动截止到10月18日结束，最后累计排名前200名玩家将获得Matrix World中的一个预售元宇宙空间作为奖励。
Matrix World是一个多元素的合成世界，为了回馈用户Matrix World将为每个玩家提供特殊的NFT空投。
以太坊用户空投
我们将为收藏以上列出的NFT藏品的所有者提供免费的空投。请注意：同一个集合的多个NFT仅计数一次，也就是说，每个集合只能获得一个空投的NFT，并且每个玩家最多可以获得8个空投。
Flow 用户空投
10 月 15 日，MatrixWorld 将在 Flow Fest 活动中提供免费NFT空投，每位节日参与者都有机会兑换一个神秘盒子。一旦用户打开神秘盒子，每个用户将直接在他们的 Blocto 钱包或任何 FCL 兼容的非托管钱包收到他们的 NFT。
ChainIDE 用户空投
10月18日之前注册并使用 ChainIDE 创建项目的 ChainIDE 用户（您必须确保您在 Matrix 注册时使用的电子邮件地址与 ChainIDE 帐户的电子邮件地址相同）。
想要获得NFT空投的用户必须在预售开始前使用持有上述列出的NFT的同一个钱包在 Matrix 官网上注册。snapshot将在Early acess结束后立即开始投票。
Matrix World将在10月10日开放预售申请并同时启动资格审查流程，欢迎大家关注Matrix官网以及discord社区了解更多详情。
了解Matrix World
2.Matrix World discord community
3.Matrix World referral contest
参与ChainIDE话题讨论会，发表你的看法~
1.在Metamask中添加xDai RPC
网络名称：xDai
RPC URL：https://xdai.poanetwork.dev/
链ID：100
2.在浏览器中打开邮件中收到的网址 （http://POAP.xyz/claim/xxxxxx），
打开显示如下，将metamask账户地址复制粘贴到下方的框内，点击Mint POAP Token
3.最后可以获得第一期 Metaverse Bootcamp的专属个人POAP NFT
工业革命解放了人类的双手，信息时代解放了人类的大脑，元宇宙将解放人类的精神家园。1000个人心目中有1000个元宇宙，但也无可厚非，“元宇宙” 不是一个单一的、全面的定义。元宇宙最好被理解为 "移动互联网的进一步发展" 。这是因为元宇宙不会从根本上取代互联网，而是在它的基础上进行迭代改造。
也许今天和明天，元宇宙只是一个在线虚拟世界——就像 Decentraland、Crypto Voxel 和 The Sandbox——你可以在其中玩快速游戏、在艺术画廊浏览 NFT 或进行在线聚会。但是在 5 年、10 年或 20 年之后，元宇宙也许会取代您在网上甚至线下所做的大部分工作。终极的元宇宙联通物理世界和数字世界，将成为未来人类的生活方式，重塑数字经济体系。
《头号玩家》和《失控玩家》的世界离我们已经不再遥远，不久的将来，我们就能进入诸如oasis、free city、free life的游戏中游览，我们在元宇宙中工作、恋爱、生活、探险...
那么，我们将采取什么路径来实现这个元宇宙的未来？通过 Facebook 的中心化科技路线？还是通过新的去中心化模型？
未来3-5年，元宇宙将进入雏形探索期，VR/AR、NFT、AI、云、PUGC游戏平台、数字人、数字孪生城市等领域渐进式技术突破和商业模式创新将层出不穷。中长期看，元宇宙的投资机会包括：GPU、3D图形引擎、云计算和IDC、高速无线通信、互联网和游戏公司平台、数字孪生城市、产业元宇宙、太阳能等可持续能源等。
腾讯CEO马化腾在《三观》序言中说到，目前从实时通信到音视频等一系列技术已经准备好，计算能力快速提升，推动信息接触、人机交互的模式发生更加丰富的变化，VR等新技术、新的硬件和软件在不同场景下的推动，即将迎来下一波全真互联网的升级。我们认为，当前技术条件仍然是步入元宇宙时代的门槛，未来在通讯和算力、交互方式、内容生产、经济系统和标准协议等领域的突破将陆续拉近与元宇宙时代的距离。
可以将元宇宙的发展格局演进分为三个阶段：
未来5-8年，随着技术端的不断发展，我们预计各大互联网巨头公司和一些专注于游戏、社交的头部公司将发展出一系列独立的虚拟平台。
预计2030年前后，随着泛娱乐沉浸式体验平台已经实现长足发展，元宇宙将基于泛娱乐沉浸式体验平台的基础向更多的体验拓展，我们预计部分消费、教育、会议、工作等行为将转移至虚拟世界，同时随着虚拟世界消费行为不断升温，并随着数字人民币等数字货币和基于NFT的数字信息资产化，经济系统开始建立，随之带动部分虚拟平台间实现交易、社交等交互。
预计2030年后，各个虚拟平台将作为子宇宙，逐渐形成一套完整的标准协议，实现各子宇宙的聚合并形成真正意义上的元宇宙；这些子宇宙依然保持独立性，只是通过标准协议将交互、经济等接口统一标准化实现互联互通，元宇宙由此进入千行百业的数字化的全真互联网阶段。
讨论：
1.当有一天，人类80%的日常生活都在元宇宙中进行时，会是怎样的场景？
2.你认为现阶段有哪些投资机遇？
3.谈一谈你了解的大厂布局。
4.分享一下你对《失控玩家》的看法。
延申阅读：
1.Metaverse元宇宙深度报告：创造独立于现实世界的虚拟数字世界
欢迎加入我们的讨论会~
9月14日晚19:52分起，公链项目Solana的主网 Beta 版开始出现不稳定状况，Solana 链上的所有应用停止运转长达18小时。
公链Solana宕机之后，所有节点都不出块，区块高度停止于最新区块，此后所有交易数据将无法被打包。期间，Solana Status发布的信息称，Solana 验证人社区选择协同重启网络，快照高度为slot 96542804。Solana Status 建议验证节点更新至 Mainnet-Beta 1.6.24 版本。
Solana的主网Beta版进行重启需要验证节点达到 80% 的绝对多数同意。直至9月15日14时左右，Solana超过80%的验证节点升级至刚刚发布的 1.6.25 版本客户端，同时，Solana的Mainnet Beta网络已经恢复正常出块。Solana 官方表示，网络已重启，其他支持系统也将在未来几小时逐渐恢复。
15日凌晨4时Solana官方公布了宕机的原因：Solana Mainnet Beta 交易负载大幅增加，TPS 最高达到 40万。这些交易淹没了交易处理排序，导致应为优先的网路关键资料无法传递，衍生分叉现象。
Solana的正常每秒交易吞吐量为5万TPS，且这已经是以太坊（ETH）的三千倍之多，40万TPS的每秒吞吐量早已突破Solana运转极限，宕机也情有可原。
2017年建立的公链Solana的技术愿景是“性能最高的去中心化网络”，依托良好的发展态势于前段时间在一大波公链的集体爆发中表现极为优异。自推出以来，该网络已在其生态系统中累积了 400 多个不同的 DApp，已有Tether、USDc、Chainlink、Terra 等已经在其他生态做的比较成熟的产品，同时也有 Serum、Raydium 、Oxygen 等 Solana 原生产品。
此次Solana危机带来的影响不亚于此前的黑客攻击，考验solana用户信任度的同时也给大家带来了更多思考。
讨论：
1.请你谈谈对solana宕机事件的看法
2.你认为未来公链的开发建设要注意哪些方面？
3.你认为社区建设在此次危机中的作用有哪些？
阅读延申：
2.2.Solana主网Beta版中断，SOL下跌13%，首席执行官承认该软件暂不完美
3.以太坊躲避了攻击，而Solana和Arbitrum遭遇宕机
欢迎加入我们的讨论~
2021年无疑是NFT的盛夏，无论你走到哪里，都会听人们谈论NFT，从年初Beeple的天价艺术画作开始，到价格已经飙到天花板的元老级NFT Crypto Punks，再到日前火的一塌糊涂的Loot，人们对NFT的狂热程度是前所未有的。
但这又引起了一个问题，NFT Summer还能持续多久？相信这也是很多人所担心的。
没人会否认加密领域的炒作周期总会在某个时刻结束，2020年的DeFi就是一个完美的例子，当整体市场情绪从长线思维转向短期收益时，就是该离开的时候了。
那么，就NFT、元宇宙本身的项目而言，如何才能在市场的牛熊波动中找到一个平衡、稳定、健康的发展路径呢？
上周末的元宇宙生态赋能交流会中，元宇宙与未来资产研究智库MetaZ创始人、NFT China首席顾问、FT中文网NFT顾问陈序老师分享了“元宇宙如何穿越牛熊？”，他的观点放到这个议题下同样非常合适。
陈序认为共情、虚拟身份以及非技术依赖是元宇宙项目在市场牛熊穿越中能被保留的三大要素。
共情是元宇宙中最重要的价值，只有尽可能打动用户，让用户能够在NFT、元宇宙中展现其个体的多元性、丰富性，让用户感受到与美好记忆的连接感，才能构建出一个具有丰富情感与想象力的元宇宙。
虚拟的数字身份是每个人在元宇宙中最珍视也是最基本的需求，围绕这个身份所展开的社会性服务以及技术延展才是真正有意义的，人们在元宇宙中塑造形象的世界观价值观甚至可能在未来影响到现实生活中的世界观价值观。
非技术依赖跳出了时间限制，不受市场因时间弹性带来核心竞争力的影响。如果项目依赖于技术，那么一旦没有走在技术前沿，就很容易因为整个市场的技术进步而被淘汰。
在元宇宙中，实际上连接和传递的价值是一种人类的共性，如果只注重于资产的可投资性、价格增长的预期，或者元宇宙中的数字身份并没有很好的与用户建立连接性，或者将自己围困在技术陷阱之中，都是无法在市场低迷的情况下依赖本身价值去维系用户情感的。
讨论：
1.你认为NFT SUMMER过后，加密艺术领域还能留下什么？
2.你认为NFT、元宇宙的长久稳定发展还需要哪些要素？
延伸阅读：
欢迎加入我们的讨论~