On-Balance Volume is a specific Trading coordinate in the Bitcoin knowledge graph. In practical terms, it identifies the subject described here: A cumulative volume indicator that adds or subtracts volume according to price direction. This definition is narrower than promotional usage and should be read together with the implementation, date and evidence attached to the entry.
On-Balance Volume is best understood as part of a system rather than as an isolated definition. Its related coordinates show the mechanisms, incentives and historical records that give the term practical meaning.
On-Balance Volume describes how participants value, trade or obtain exposure to bitcoin. Market behavior can affect adoption and mining economics, but it does not rewrite consensus rules. Price evidence and protocol evidence answer different questions.
Understanding On-Balance Volume helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.
On-Balance Volume is cumulative: add current volume when the close rises, subtract it when the close falls, and leave the value unchanged when closes are equal. The starting level is arbitrary, so direction and divergence matter more than the absolute number; fragmented Bitcoin venue volume makes data-source choice critical.
Primary records expose these checkable anchors: close↑: OBVₜ=OBVₜ₋₁+volumeₜ · close↓: subtract volumeₜ · close=: unchanged. Dates, roles, formulas and institutional actions should be verified there before interpretation.
The safe boundary is: OBV divergence ≠ guaranteed reversal; exchange volume ≠ global Bitcoin volume; cumulative level ≠ comparable across arbitrary starts. The coordinate records evidence and mechanism; it does not turn advocacy, correlation or a model output into a Bitcoin consensus fact.
For the clearest picture, read this entry together with Divergence, Technical indicator, Technical analysis.