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    A sidechain is a blockchain ledger running in parallel to a primary blockchain. A two-way link between the primary blockchain and the sidechain allows the sidechain to operate independently of the primary blockchain, using its own protocols or ledger mechanisms. Cryptocurrencies on the sidechain are connected to the main chain via a two-way link, allowing users to transfer their assets to and from the primary blockchain. Sidechains facilitate different transaction types to occur on separate chains, promoting blockchain scalability.