The foundation of the Integra Ledger ecosystem is the Integra ID, a globally unique identifier (GUID) assigned to a document. Each document or contract is inherently unique due to its contents. By registering it on Integra, the document is assigned a unique identifier. It's important to note that the Integra ID is generated by your software and not by the blockchain itself. This ID acts as a foreign key that can be used across any software system in any organization. This means a unique document at one organization can be associated with the same unique document at another organization using the common Integra ID.