15. A non-transitory computer storage medium having computer executable instructions which when executed by a computer cause the computer to perform operations comprising: providing at least a first user and a second user remote access to an electronically stored document that includes document content; applying a first electronic signature to the electronically stored document to produce an initial signed version of the electronically stored document, wherein the first electronic signature includes information that associates the first electronic signature with the initial signed version of the electronically stored document, the first electronic signature verifies integrity of the document content of the initial signed version of the electronically stored document, and the first electronic signature includes a first cryptographic component; subsequent to applying the first electronic signature to the electronically stored document, modifying the document content of the initial signed version of the electronically stored document thereby producing a first revision of the electronically stored document; subsequent to modifying the document content of the initial signed document, applying a second electronic signature to the first revision of the electronically stored document, wherein the second electronic signature includes information that associates the second electronic signature with the first revision of the electronically stored document, the second electronic signature verifies integrity of the document content of the first revision of the electronically stored document, and the second electronic signature includes a second cryptographic component; and generating a revision history of the electronically stored document, wherein the revision history associates the first electronic signature with the initial signed version of the electronically stored document and associates at least the second electronic signature with the first revision of the first electronically stored document.
20. The non-transitory computer storage medium of claim 15 , wherein the first electronic signature and the second electronic signature are both associated with the same user.