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What Are Sidechains? Extending & Providing Extra Functionality to Existing Blockchains » Purdy's Two Cents
Sidechains are an essential innovation in the blockchain field with some interesting long-term implications and effects on the broader interoperability and scalability of blockchain networks. They are effectively extensions of existing blockchains that increase their functionality and allow for validation of data from other blockchains and for assets to be seamlessly transferred between them.