WebAssembly (WASM) Overview
WebAssembly (WASM) is a highly performant, low-level binary format designed for the web that is increasingly being adopted in the blockchain and decentralized application (dApp) space
. It functions as a virtual machine for programming languages, offering an execution environment that aims to surpass the limitations of older technologies like JavaScript
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Key Characteristics and Benefits
WASM is designed to provide an efficient and extensible execution environment .
- Performance and Efficiency WASM enables smart contracts to be compiled directly into machine code, which ensures speed and efficiency 2. This is a significant advantage over older virtual machines, such as the Ethereum Virtual Machine (EVM), which is 256-bit focused and slow .
- Language Support WASM supports multiple programming languages, including Rust, C, and AssemblyScript . This allows developers to write contracts in various languages that can then be compiled to WebAssembly .
- Blockchain Integration In the context of blockchain, WASM is used to improve the consensus layer and overall performance . Projects like Gear Protocol leverage WASM to enable faster and more efficient smart contract execution 2.
WASM in Blockchain Ecosystems
WebAssembly is a foundational technology for several major blockchain projects and frameworks:
- Cosmos Ecosystem The Cosmos SDK includes CosmWasm, a smart contracting platform module that allows developers to add WebAssembly support to Cosmos-based projects . The Axelar Virtual Machine (AVM), which brings programmability to the Axelar network, is powered by CosmWasm, allowing developers to deploy contracts written in any language that compiles to WASM .
- Ethereum The concept of integrating WASM into Ethereum, known as Ewasm (Ethereum-flavored WebAssembly), was introduced to address the limitations of the EVM . The goal is to provide a more efficient execution environment, with plans to integrate it into the Ethereum mainnet . Tools like Wasm Chisel are used to transform and validate WebAssembly bytecode to ensure compatibility with eWasm .
- NEAR Protocol The NEAR Foundation and Polygon Labs collaborated to develop a zero-knowledge (ZK) prover specifically designed for Wasm blockchains .
WASM is also being explored for use cases beyond smart contracts, such as running user-defined code, system integration, and powering user-defined functions (UDFs) in databases like PostgreSQL
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