Off-Chain: Moving Some Processing Outside the Main Chain
An off-chain solution processes transactions or data outside the main blockchain and submits only the necessary final result to the underlying blockchain, improving processing efficiency and reducing fees. It is often used for small payments and Layer 2 scaling, but its security depends on the particular mechanism and service framework.
How Off-Chain Processing Works
Off-chain refers to transactions or processes completed outside the main blockchain network. A secondary chain or external system may process the operations, while the main chain normally records only the final settlement result or balance state. This reduces the data that every network node must validate transaction by transaction, easing congestion and increasing throughput.
Uses of Off-Chain Transactions
An off-chain transaction does not need to wait for miners or validators to confirm every operation, so it is generally faster and less expensive and is suitable for small payments such as everyday purchases. However, an off-chain service must establish its own security framework to prevent payments from being forged or altered, and the degree of protection depends on the solution used.
Layer 2 and the lightning network
Layer 2 is a scaling protocol built on an existing blockchain that can move some processing off-chain through mechanisms such as state channels, sidechains, or rollups. The Bitcoin lightning network uses state channels and generally records only the opening and closing of a channel on the main chain, while the parties complete intermediate balance updates off-chain.
Trade-Offs between On-Chain and Off-Chain
An on-chain transaction is written directly to a blockchain, must be validated by network participants, and pays the corresponding fee. Its advantage is that it uses the main chain's transparency and security mechanisms. An off-chain transaction reduces the need for immediate recording, making it faster and cheaper, but its validation method, privacy characteristics, and security boundary depend on the specific implementation.
Original Tutorial
https://www.binance.com/zh-CN/academy/glossary/off-chain
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