The assumption that inputs spent together are controlled by one entity; CoinJoin and PayJoin deliberately challenge it.
Common-input ownership heuristic 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.
Common-input ownership heuristic should be evaluated against a concrete threat model: what is protected, from whom, for how long and at what operational cost. A design may remove one dependency while introducing another, so custody, privacy and verification must be judged as a complete system.
Understanding Common-input ownership heuristic helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.
For the clearest picture, read this entry together with Chain surveillance, CoinJoin, PayJoin, Address clustering. The reverse links also lead from PayJoin, Chain surveillance, Address clustering.
Linked to related atlas coordinates
Grounded in a source record
Explains function and trade-offs
Part of the open Bitcoin knowledge graph