What is a Timestamp and why is it essential?

What is a Timestamp?

A timestamp is a digital record that proves exactly when a particular event occurred. In the context of digital evidence, it guarantees that a screenshot, document, or file existed at a specific moment in time.

How does it work?

The timestamping process involves three main steps:

1. Hash generation: The digital content is processed by a cryptographic algorithm (such as SHA-256) that generates a unique "fingerprint"
2. Temporal registration: This hash is associated with a precise date and time, obtained from a reliable source
3. Immutable storage: The record is stored in a medium that cannot be altered afterwards

Why is it essential for digital evidence?

Without a reliable timestamp, any digital evidence can be questioned regarding its temporal authenticity. An adversary may claim that:

• The capture was made on a different date than alleged
• The content was modified after capture
• The evidence was fabricated retroactively

Timestamps in Lexato

Lexato uses timestamps from multiple sources to ensure maximum reliability:

• Registration on Polygon and Arbitrum blockchains
• Timestamp with millisecond precision
• Independent verification by anyone

Conclusion

The timestamp is the foundation of any reliable digital certification system. Without it, digital evidence loses much of its probative value.