Lightning Network
Instant, low-fee Bitcoin payments via off-chain payment channels.
The Lightning Network was proposed in a 2016 whitepaper by Joseph Poon and Thaddeus Dryja. It solves Bitcoin's base-layer throughput limit by moving payments off-chain into bidirectional payment channels, settling only the net result on-chain when channels open or close.
Lightning requires SegWit — transaction malleability had to be fixed before channels could be secured. The first mainnet Lightning payment occurred in January 2018 at block 498,222 when Laszlo Hanyecz — famous for Bitcoin Pizza Day — bought a router via Lightning.
Adoption accelerated through 2019–2021. Jack Mallers' Strike and the El Salvador Bitcoin Law demonstrated Lightning as a payments rail for everyday commerce. By 2019, network capacity surpassed 1,000 BTC locked in channels. Today Lightning processes millions of payments monthly with sub-cent fees.
Key Benefits
Outcome
Live and growing. Powers Strike, Cash App Lightning, El Salvador's Chivo wallet, and a global mesh of routing nodes — Bitcoin's primary scaling path for payments.
Key People
Key Blocks
Timeline
Lightning Network Whitepaper
Joseph Poon and Thaddeus Dryja publish the Lightning Network paper.
SegWit Activates
Segregated Witness goes live at block 481,824.
First Lightning Payment on Mainnet
Laszlo Hanyecz buys a router via Lightning — pizza guy strikes again.
Lightning Surpasses 1,000 BTC Capacity
Layer-2 network reaches 1,000 BTC locked in channels.
Bitcoin 2021 Miami Conference
12,000 attendees — the largest Bitcoin conference ever.
El Salvador Adopts Bitcoin as Legal Tender
First nation-state to make Bitcoin legal tender.