B² Network is a pioneer of the BTC second-layer network. It is based on Bitcoin's zero-knowledge proof verification commitment and EVM-compatible ZK Rollup, bringing the talent of Ethereum to the Bitcoin ecosystem.
Technology Architecture
The technical architecture of B² Network mainly consists of two layers, the Rollup layer and the DA layer. Simply understand this architecture: you need a virtual machine to process user transactions, and you also need a place to store data and verify transactions.
At the rollup layer, B² adopts the zkEVM solution and will work with Polygon Labs to expand Polygon CDK to BTC.
Through account abstraction, users can use either Ethereum accounts or BTC accounts to interact. Commonly used wallets such as Unisat and Metamask can also continue to be used, reducing user learning costs;
The main account can use the Transaction Bundler service to pay gas for the sub-account.
User transactions are submitted and processed in the Rollup layer, and the user's status is also stored in the Rollup layer. The network will generate relevant zero-knowledge proofs, package them and send them to the DA layer for storage and verification.
The DA layer includes decentralized storage, B² nodes and the Bitcoin network, which is used to verify Rollup's zero-knowledge proof, permanently store a copy of the data in the Rollup layer, and finally imprint the data into the Bitcoin network through inscriptions.
The entire data flow is shown in the figure below. After B²'s sorter packages the user transaction data, it saves it through distributed storage to avoid single points of failure and increase reliability.
In order to ensure data availability, B² will write Tapscript scripts to the Bitcoin network within each block to achieve continuity in data availability time.
In the Ethereum network, Rollup transfers data from the second-layer network to the contract on the main network through calldata to verify transactions and save data. However, the Bitcoin network does not support automatic verification of smart contracts. ZK-Rollup only uses Taproot. Writing zero-knowledge proof and Rollup's aggregated data into Bitcoin ensures that ZK-Rollup's data is anchored in Bitcoin and cannot be tampered with.
However, it does not guarantee the validity and correctness of transactions within ZK-Rollup, nor can it use Bitcoin’s powerful consensus capabilities to ensure the security of Layer 2 ZK-Rollup.
Therefore, the solution adopted by B² is to write the commitment of zero-knowledge proof into the main network, allowing challengers to challenge the commitment of zero-knowledge proof verification within a specified period. If someone successfully challenges, the Rollup will be rolled back and the challenger will win the assets locked by the node; if no one challenges during the challenge period or the challenge fails, the Rollup will be finally confirmed on BTC.
目前的投资机构也比较牛，有Hashkey，OK，ABCDE,IDG,KUCOIN等
Currently, officials can see that TVL has reached 400 million US dollars and the total number of users is 450,000.
There are currently 2 missions, one is Odyssey and the other is Buzz.
一.Odyssey任务攻略
Click to enter the official website
https://task.bsquared.network/leaderboard?code=FBuBRQs, click Odyssey to enter, and click eran points.
第一个就是各种的关注，点击加入Discord，第二个加入twitter，第三个follow它的twitter，都很简单，按照步骤点击即可。
第二个就是在它的桥上，把btc存到B² Network Testnet，一开始没有币，可以去水龙头领取，
Faucet address: https://www.bsquared.network/faucet/
输入EVM地址和比特币地址都可以。
做这个任务必须要选择unisat钱包，没有去安装一个。
在下面建议先去做最后一个任务，因为最后一个任务的官网有水龙头地址，可以领取usdc，是之前任务必须的测试币。
点击任务，进入到layerbank，然后右上角有一个requset coins，可以领取2种测试币。
然后找到这个market，点击btc
输入supply的数值，looping勾选上，钱包交互。
在切换到borrow，借一定数量的代币，这2个任务都完成了。
Let's go back to the following task. Meson's task is to pledge BTC to its testnet and use the unisat wallet link.
下一个任务去glowswap做一次swap，提供流通性和质押。
swap中，你要用之前领取到的usdc换取一些usdt
在选择添加流动性，你选择usdt和usdc的池子去添加。
stake中你选择farms中的stak质押
2.Buzz activity
Click the link to enter https://buzz.bsquared.network?code=cNIWh
Fill in the invitation code;cNIWh
第二步，follow它的twitter，然后点start
然后你可以选择eth链上存入一些eth，
Of course, it supports 5 chains, including BTC, ETH, BNB, and Polygon.
So here you have completed all the tasks. Then some friends asked Teacher Zhu, how can I find a first-hand early-stage project for interactive airdrops? In fact, we have talked about a task platform called galxe before. You can watch the potential analysis of the leading WEB3 task platform Galxe (GAL) in the previous program.
There are many project tasks in it that you can do. I think you can choose some projects that are followed by many people. For example, the beras project currently has 4 million people, so a project with a large number of people must be a good project. , you can also follow the steps step by step, it is very simple.
As for this beras project, we will do a separate program to talk about it when it comes online.