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Crypto Glossary/Sidechain


Sidechains are separate blockchains connected to a main blockchain, allowing for asset and data transfer. They enhance scalability, privacy, and interoperability, and enable experimentation and innovation.

TLDR - Sidechain

A sidechain is a separate blockchain that is connected to a main blockchain, allowing for the transfer of assets or data between the two chains. It enables developers to experiment with new features and functionalities without risking the security and stability of the main blockchain. Sidechains can be used to enhance scalability, privacy, and interoperability in blockchain networks.

What is a Sidechain?

A sidechain is a secondary blockchain that operates alongside a main blockchain, often referred to as the parent chain. It is connected to the main chain through a two-way peg, which allows for the transfer of assets or data between the two chains. Sidechains are designed to provide additional functionalities and features that may not be available or feasible on the main chain.

How Does a Sidechain Work?

A sidechain operates independently from the main chain but is still connected to it. The two chains communicate through a two-way peg, which is a mechanism that enables the transfer of assets or data between the main chain and the sidechain. The two-way peg ensures that the assets or data moved to the sidechain are locked on the main chain and can be unlocked and transferred back at any time.

When assets or data are transferred to the sidechain, they become available for use within the sidechain's ecosystem. This allows developers to experiment with new features, implement different consensus mechanisms, or enhance scalability and privacy without affecting the main chain. The sidechain can have its own rules and governance, providing flexibility and customization options.

Benefits of Sidechains

Sidechains offer several benefits that contribute to the overall improvement of blockchain networks:


Sidechains can help alleviate scalability issues by offloading some of the transactions from the main chain. By moving certain activities to a sidechain, the main chain can focus on processing critical transactions, resulting in increased throughput and reduced congestion.


Sidechains can provide enhanced privacy features that may not be available on the main chain. By segregating specific activities or data onto a sidechain, users can enjoy increased privacy and confidentiality. This is particularly useful for applications that require sensitive information to be kept private.


Sidechains enable interoperability between different blockchain networks. Assets or data can be transferred between sidechains and the main chain, allowing for seamless integration and collaboration between different blockchain ecosystems. This promotes the exchange of value and information across multiple chains.

Experimentation and Innovation:

Sidechains provide a sandbox environment for developers to experiment with new features and functionalities. By creating a separate chain, developers can test and implement innovative solutions without risking the stability and security of the main chain. This fosters innovation and encourages the development of new blockchain applications.

Examples of Sidechains

Several blockchain projects have implemented sidechains to enhance their networks:

Bitcoin's Lightning Network:

The Lightning Network is a layer-two scaling solution built on top of the Bitcoin blockchain. It operates as a sidechain that enables faster and cheaper transactions by conducting most of the transactions off-chain. The Lightning Network allows users to create payment channels and settle transactions without burdening the main Bitcoin blockchain.

Ethereum's Plasma:

Ethereum's Plasma is a framework for creating scalable and secure sidechains. It allows for the creation of child chains that can process transactions independently while still being connected to the Ethereum main chain. Plasma sidechains can benefit from Ethereum's security and decentralization while providing faster transaction processing and increased scalability.

RSK (Rootstock):

RSK is a sidechain platform that is connected to the Bitcoin blockchain. It enables the execution of smart contracts on a separate chain, providing similar functionality to Ethereum but with the security and stability of the Bitcoin network. RSK aims to bring the benefits of smart contracts and decentralized applications to the Bitcoin ecosystem.


Sidechains are a powerful tool that allows for the expansion and enhancement of blockchain networks. They provide scalability, privacy, interoperability, and a platform for experimentation and innovation. By connecting to a main chain through a two-way peg, sidechains enable the transfer of assets or data while maintaining the security and stability of the main chain. As blockchain technology continues to evolve, sidechains will play a crucial role in unlocking new possibilities and driving the adoption of decentralized applications.

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