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signature – Understanding the common input ownership heuristic

Have I understood the concept of address, account and wallet correctly and how the wallet balance is calculated?

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I understand that the common input ownership heuristic states that in a transaction all inputs are deemed to be controlled by the same person. But given that a signature must be provided for each individual input it is possible that multiple parties (each owning an input) collaborate and produce a transaction. This is the basis of coinjoin.

Given this, why is the common input ownership heuristic so heavily relied upon when conducting blockchain analysis and identifying clusters? Aside from address reuse (which is much more clear cut), it is one of the more commonly used heuristics for linking addresses. So why is it that if a coinjoin service is identified any common input heuristic is discarded, but for some random transaction it is deemed to apply?

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Written by BTC Artist

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