1. A computing system, comprising: a record tokenizer configured to receive first and second records, each record including an item identifier that identifies an item that is a subject of the record and a set of attributes, the tokenizer normalizing the first and second records to obtain corresponding first and second entity tokens, each entity token representing the item identifier and attributes in the corresponding record in a normalized form; and a record matcher configured to: compare the first entity token to the second entity token to identify a similarity measure and provide a match result indicative of whether the first and second records resolve to a same item as their subject, based on the similarity measure; select the first and second records from a record block and, in response to the match result indicating that the first and second records do not resolve to the same item, access a wide area network search engine and launch a wide area search, using the first entity token as a search input, and obtain search results, the search results being added to the record block as records to be tokenized by the record tokenizer and compared using the record matcher.