The Lightning Network aims to provide an accessible way for users to engage in off-chain payments quickly and reliably by adding another layer to the Bitcoin blockchain. Lightning is constructed on the notion of payment channels, which allow two parties lock up on-chain funds in the channel to transact without pushing their transactions to the blockchain. Each party can send a net value of up to the initial amount locked on their side of the channel. This chart graphs the total sum of balances available across all lightning payment channels, also known as the Channel capacity.