Source Reliability.

1. 01
   Authoritative
   Public registries, notarial deeds, cadastral records, energy performance certificates issued under law.
2. 02
   Professional
   Surveyor, lawyer, notary and technical reports produced under professional responsibility.
3. 03
   Structured commercial
   Listings on regulated marketplaces or from registered agencies, where the publisher is identifiable.
4. 04
   Unstructured
   Social posts, private chats, informal notes. Useful signal, low intrinsic reliability.

A claim's confidence rises when independent sources agree, and falls when they disagree. A single unstructured source is treated as a lead, not evidence.

Because a decision made on the wrong reliability class is not a mistake — it's a foreseeable failure. Making the class visible is the first line of defence.