A Lightning Capacity Milestone: What the Metric Can Support

Lightning capacity crosses a round number and is reported as a growth milestone. It is a real figure. It measures something narrower than the coverage implies.

What capacity is

The sum of Bitcoin committed to channels that have been publicly announced to the gossip network. It is an upper bound on what could move through those channels at an instant — not a record of what has moved.

Two structural blind spots

First, private channels are excluded. Many channels, including a large share of those used by custodial services and consumer applications, are never announced. Public capacity therefore understates the network by an unknown amount — and “unknown” is the operative word, since nobody can measure what is not announced.

Second, capacity is not throughput. A channel can route the same balance repeatedly; one satoshi of capacity can carry many payments. Capacity could fall while payment volume rises, and the headline would read as decline.

Why payment volume is not published

Because it is not observable. Lightning payments do not touch the chain, and no participant sees more than the routes passing through it. That is a privacy property, not a gap to be fixed — but it means anyone quoting a total Lightning payment volume is extrapolating from a sample, and should say so.

What the number is good for

Directionally, over long periods, capacity indicates whether operators are willing to commit capital to routing. That is a genuine signal about infrastructure investment. It is not a usage statistic, and treating it as one is the most common error in Lightning coverage.