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Lightning Network
The Lightning Network is a payment network built on top of Bitcoin. Two people lock bitcoin into a shared channel on the main chain, then swap balance updates privately and instantly; payments can hop across several channels to reach someone you have no channel with.
What it means for you. Lightning bitcoin sits in channels, not in an ordinary on-chain address, so moving it back to the main chain means closing a channel, which costs an on-chain fee and takes longer if the other side does not cooperate. If a counterparty broadcasts an outdated channel state, you or a monitoring service need to respond within a set number of blocks, or funds can be lost.
Sources: Lightning Network paper (Poon and Dryja), BOLT #0: Introduction and Index (Lightning specification) · checked 4 October 2026
Sidechain
A sidechain is a separate blockchain that runs alongside a main chain such as Ethereum, with its own validators and consensus rules, and is linked to it by a two-way bridge. Unlike a rollup, it does not post its transaction data back to the main chain.
What it means for you. A sidechain's security comes from its own validators, not from Ethereum, so if they act dishonestly Ethereum cannot correct it. Tokens moved there through the bridge are usually burned on one side and minted on the other, so their value depends on that bridge and its contracts working as intended.
Source: ethereum.org: Sidechains · checked 4 October 2026