BEVM (Bitcoin EVM)¶

BEVM (Bitcoin EVM) is an EVM-compatible Bitcoin Layer 2 solution designed to bring Turing-complete smart contract functionality to the Bitcoin ecosystem while inheriting as much security as possible from the Bitcoin mainchain. It allows developers to deploy and run EVM-compatible DApps on Bitcoin Layer 2 and interact with Bitcoin native assets.

Problems Addressed¶

The Bitcoin mainchain is renowned for its robust security and decentralization, but its scripting language is limited in functionality, making it difficult to support complex smart contracts and high-performance decentralized applications. BEVM aims to solve:

Insufficient Bitcoin programmability: Bringing EVM-compatible smart contract capabilities to the Bitcoin ecosystem without modifying the Bitcoin mainnet.
Low asset utilization: Securely bridging the large amount of BTC and Bitcoin native assets (such as Ordinals, BRC-20) from the mainnet to Layer 2 for use in DApps.
Fragmented developer ecosystems: Lowering the barrier for Ethereum developers to enter the Bitcoin ecosystem, fostering the integration of both ecosystems.

Implementation Mechanisms and Principles¶

The core of BEVM is to bridge Bitcoin assets from the mainnet to the BEVM chain through multi-signature mechanisms and cryptographic techniques, while providing an EVM-compatible execution environment on BEVM.

Bitcoin Asset Cross-Chain Bridging¶

Asset Locking: When a user wants to bridge BTC to BEVM, they send BTC to a multi-signature address (m-of-n multisig address) on the Bitcoin mainnet. This multi-signature address is jointly controlled by BEVM validators.
Minting on BEVM: Once the BTC is locked on the mainnet, a contract on the BEVM chain mints an equivalent amount of wrapped Bitcoin (such as a BTC or wBTC equivalent) for the user.
Technological Evolution: BEVM is actively exploring more decentralized and secure cross-chain technologies, such as leveraging Schnorr signatures, Threshold Signatures, and MPC (Multi-Party Computation), to reduce reliance on centralized multisig sets.

EVM Compatibility¶

BEVM provides a runtime environment that is highly compatible with the Ethereum Virtual Machine. This means developers can use familiar tools such as Solidity, Truffle, and Hardhat to deploy and run smart contracts on BEVM. These contracts can interact with cross-chain Bitcoin assets.

Consensus Mechanism¶

As an independent Layer 2, the BEVM chain typically employs an efficient consensus mechanism such as PoS (Proof of Stake) or DPoS (Delegated Proof of Stake) to achieve high throughput and low latency. Its validator network is responsible for processing transactions on the BEVM chain and maintaining network security.

Security Inheritance from Bitcoin¶

BEVM's security ultimately depends in part on the robustness of its cross-chain mechanism and the degree of decentralization of its validator network. By continuously optimizing multi-signature mechanisms and introducing more advanced cryptographic techniques (such as on-chain fraud proofs and zero-knowledge proofs), BEVM aims to maximize the inheritance of Bitcoin mainchain security.

Key Features¶

EVM Compatible: Lowers the barrier for Ethereum developers to enter the Bitcoin ecosystem, accelerating the development of the Bitcoin DApp ecosystem.
Bitcoin Asset Bridging: Allows BTC and other Bitcoin native assets to circulate and be used on Layer 2, unlocking their value.
Turing Complete: Supports complex smart contract logic, expanding Bitcoin's application boundaries.
High Scalability: Achieves higher transaction throughput and lower transaction fees through the Layer 2 approach.
Progressive Decentralization: Gradually enhances the decentralization of cross-chain and consensus mechanisms by continuously introducing technologies such as Schnorr signatures and MPC.