Provenance
Data sources and status
The source hierarchy, verification fields and usage principles applied to PropertySeller data.
Decision principle
Technical access does not establish permission to reproduce a dataset.
01
Preferred sources
Official regulators/government, official agency pages, licensed datasets and attributed primary material.
02
Required record fields
Material facts retain source, URL, dates, usage notes, status and calculation method.
03
No silent substitution
Third-party estimates are labelled and never silently replace an unavailable official rate.