Understanding SHA-256 Hash Chaining
The Problem with Traditional Logs
Most e-signature platforms store audit logs as simple database rows. While seemingly secure, individual rows can be altered or deleted by anyone with database access without leaving a trace. In a court of law, this creates a 'chain of custody' issue.
Enter the Cryptographic Chain
IUSign solves this by chaining every event. When a document is viewed, we hash the event data along with the hash of the PREVIOUS event. This creates an unbreakable sequence. If event #5 is altered, its hash changes, breaking the link to event #6 and invalidating the entire provenance record.
Mathematical Defensibility
We use the SHA-256 algorithm—the same standard used in blockchain and high-security government data—to ensure that even a single byte of change in the document or the logs is immediately detectable.
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