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  1. Home
  2. /Glossary
  3. /Sidechain
Back to Glossary
blockchain

Sidechain

A separate blockchain connected to a main chain through a two-way bridge.

Definition

A separate blockchain connected to a main chain through a two-way bridge. Sidechains have their own consensus and security but inherit some trust from the main chain. Polygon started as an Ethereum sidechain before becoming more complex.

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Learn More About Sidechain

GuideLayer 2 Solutions Guide

Related Terms

Layer 2

A secondary network built on top of a Layer 1 to improve scalability.

Bridge

A protocol that lets you move tokens between different blockchains.

Scalability

A blockchain's ability to handle increasing transaction volume without degrading performance or raising fees.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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