Surety Integrity Seals provide long-term integrity protection and have the evidentiary quality to stand up under the most intense scrutiny. We use a technique called "hash chain linking" where the binding of a time value to a document is accomplished by hashing the document and time value and then linking the results into Surety's hash chain. The integrity of the chain itself is protected and auditable through our Widely-Witnessed process, where once a week we publish the hash chain’s integrity value in the Public Notices section of the New York Times. This anchors the integrity of the Seal and as a result, you are guaranteed future verifiability and compelling evidence of document integrity.

To take this one step further, Surety provides the capability of extending Surety Integrity Seals to include the complete linkage to the New York Times integrity value. The advantage of Extension is that the extended Seal contains all the data required for a completely independent validation. This means that a third party can validate a Seal without placing any trust on another party's people, processes, or systems, including Surety. The validation process relies only on the data in the Seal, the published value in the New York Times, and the application of standard, widely-analyzed, and widely-trusted secure hash algorithms. It is this independence that gives Surety Integrity Seals their outstanding evidentiary quality.

Our open, Widely-Witnessed process makes it impossible for anyone—including Surety—to backdate time-stamps or validate electronic records that were not exact copies of the originals. As a convenience, you can look up any of Surety’s published integrity values.Click Here.