B² Network
  • B² Network
    • Overview
  • Airdrop Guide
  • Zero-Knowledge Proof Verification Commitment for ZK-Rollup on Bitcoin
  • Tech Architecture
    • Rollup Layer
    • DA Layer
      • Decentralized Storage
      • B² Nodes
      • B² Inscription
      • B² Commitment
      • Bitcoin Network
  • For Users
    • Connecting to B² Mainnet
    • Set Gas Price
    • Join B² Network Discovery
    • Bridge to B² Mainnet
    • Transfer BlockHeadz NFT
  • For Developers
    • Basic information
    • Write a contract
    • Deploy a contract with Hardhat
    • Verify contract code with Hardhat in Explorer
    • Verify contract code with Hardhat in Blockscout
    • Integrate Particle Account Abstraction
    • Integrate Oracle Services
    • Deploy a rollup node
    • Deploy a rollup archive node
  • Tokenomics
  • Press-Kit
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  • Data Availability Layer
  • Decentralized Storage
  • B² Nodes
  • Bitcoin Network

Tech Architecture

PreviousZero-Knowledge Proof Verification Commitment for ZK-Rollup on BitcoinNextRollup Layer

Last updated 1 year ago

The technical architecture of B² Network is shown in Figure . Comprising two fundamental layers, Rollup Layer and Data Availability Layer, B² Network seeks to redefine the way we perceive Bitcoin Layer-2 solutions.

B² Network Architecture

Rollup Layer

B² Network employs ZK-Rollup as Rollup Layer. ZK-Rollup Layer adopts the zkEVM solution, responsible for the execution of user transactions within the Layer-2 network and the output of related proofs.

Users' transactions are submitted and processed in the ZK-Rollup Layer. The users' state is also stored in the ZK-Rollup Layer. The batch proposals and the generated zero-knowledge proofs are forwarded to the Data Availability Layer for storage and verification.

Data Availability Layer

Data Availability Layer includes Decentralized Storage, B² Nodes, and Bitcoin Network. This layer is responsible for permanently storing copies of rollup data, verifying rollup zk proofs, and ultimately performing the final confirmation on Bitcoin.

Decentralized Storage

A pivotal aspect of B² Network, the decentralized storage serves as the repository for the ZK-Rollup's user transactions and their respective proofs. By decentralizing storage, the network inherently enhances security, reduces single points of failure, and ensures data immutability.

B² Nodes

B² Nodes consist of multiple modules, performing various roles:

  1. They incentivize Decentralized Storage, ensuring accurate and efficient storage of B² rollup data copies through zk proof of storage and economic incentives.

  2. B² Nodes validate the zk proof of rollups, checking the accuracy and efficiency of zk rollup transactions and state generation.

  3. B² Nodes provide decentralized sequencer services for B² rollups, selecting sequencers in a DPoS-like manner, ensuring decentralization and preventing malfeasance by a single sequencer.

  4. B² Nodes supply Bitcoin block and transaction data for integrating Bitcoin state in B² rollups and generate zero-knowledge proofs to ensure data security.

  5. The Bitcoin committer module of B² Nodes writes $B^{2}$ rollup data into Bitcoin via Tapscript, creates bit value commitments for zk proof verification, and performs final confirmations on Bitcoin through challenge-response mechanisms.

  6. B² Nodes maintain Schnorr multi-signature verifiers.

Bitcoin Network

Bitcoin Network is the final settlement layer for B² Network. Users can recover all B² rollup transactions through Bitcoin and validate their authenticity using zk proofs recorded on Bitcoin. B² Network employs zk proof verification commitment and challenge-response mechanisms for final confirmations on Bitcoin. This process, supported by Bitcoin's robust Proof of Work (POW) algorithm, ensures the security of B² rollup.

At last, the transaction flow is shown in Figure

B² Transaction Flow
B² Transaction Flow
B² Network Architecture