14. The one or more computer-readable media of claim 13 , wherein the data is employed to verify that the tangible version of the document has not been altered since the seal was applied.
14. The one or more computer-readable media of claim 13 , wherein the data is employed to verify that the tangible version of the document has not been altered since the seal was applied. 16. The one or more computer-readable media of claim 14 , wherein: the data includes an identifier; and verifying that the tangible version of the document has not been altered since the seal was applied includes: sending the identifier to a back-end service and, in response, receiving a hash of information in the document; determining a current hash of the information in the document; and comparing the current hash to the hash encoded in the seal.