30. A method of doing business by providing verification services for descriptive statements about electronic resources, said method comprising: receiving a digital signature and a set of descriptive statements; validating whether the digital signature conforms to a set of descriptive statements, including creating an aggregate hash value by applying a commutative function to multiple independent hash values, each independent hash value based upon a subset of the descriptive statements, decrypting the digital signature and comparing information represented by the signature with the aggregate hash value, to detect whether there is a match condition; and providing a verification response upon detection of the match condition, and providing a failure response if a match condition is not detected.
31. A method according to claim 30 , wherein: said method further comprises calculating at least one attribute representing the set of all descriptive statements represented by the aggregate hash value; and decrypting the digital signature and comparing information includes comparing information represented by the signature with the at least one attribute, to detect whether there is a match condition.