The Lightning Network is a Layer 2 payment protocol built on top of Bitcoin. It enables near-instant, near-free Bitcoin transactions by creating off-chain payment channels between parties. Only the opening and closing of channels are recorded on the Bitcoin blockchain.
2016
Lightning Network whitepaper published by Poon and Dryja
2018
Lightning Network mainnet launches on Bitcoin
2021
El Salvador adopts Lightning for Bitcoin payments nationally
2023
Lightning capacity exceeds 5,000 BTC
Bitcoin micropayments, instant transactions, low-fee remittances
💡 Did You Know
The Lightning Network has processed billions of payments, including being used to pay for coffee in El Salvador's Bitcoin Beach community
⚠ Controversies & Red Flags
Lightning requires users to keep channels funded and online, creating complexity. Routing failures for large payments remain a practical challenge.