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Time stamping services such as Surety's [HS91] are another example of a hash tree. In this case there is a mechanism for recomputing the tree and reliably publishing the hash every second, thus allowing rapid generation of an existence proof for a document.

We hope that formats for the inclusion of timestamps and other such evidence within the ERL structure and within HTML generally can be developed that is acceptable and useful to all parties.

Fabien A.P. Petitcolas, Computer Laboratory, University of Cambridge