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sidechain

The Lightning network is not a sidechain. A sidechain relies on its own blockchain which is coupled to the Bitcoin blockchain via a two-way peg. On the other hand, the Lightning Network consists of native Bitcoin 2-of-2 multisig transactions. When two Lightning nodes open a payment channel, they both send funds to one multisig address and each provides the counterparty with a pre-signed exit transaction. If a party wants to resolve the payment channel, they can unilaterally add their own (the second) signature and send the transaction to the Bitcoin network for confirmation.
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