What Are Digest Logs, And Why Are They Important?

To further protect against fraudulent pre- or post-dating of ProofMarks, the ProofSpace Server creates a concatenate digest log of all ProofMark requests and records it within the corresponding Interval. At the end of each interval, a digest is created from the digest log itself, and then inserted into the new interval, prior to the signature by the prior private key.

Since the sequence and content of ProofMark requests is unlikely to be known in advance, this feature constrains generation of fraudulently pre- and post-dated ProofMarks.