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A sidechain is a designation for a blockchain ledger that runs in parallel to a primary blockchain. Entries from the primary blockchain can be linked to and from the sidechain; this allows the sidechain to otherwise operate independently of the primary blockchain (e.g., by using an alternate means of record keeping).
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- "Sidechain article on Bitcoin wiki".
- "It's 2019, Where Are Bitcoin's Sidechains?".
- "Drivechain Software site".