The Semantic Web stack includes a trust layer to assimilate the ontology, rules, logic, and proof layers to provide a mechanism to verify that the source of information is really who the source claims to be. Proof of trust takes place in four different areas:

  1. Policy-based trust
  2. Reputation-based trust
  3. General models of trust
  4. Trust in information resources

WebSig is a digital signature scheme for the web that uses Resource Description Framework (RDF) graphs to express its documents, document metadata, and signature data in a way that leverages existing trustable digital signature schemes to create signatures on computable documents that are trustab