---
title: ProofIt Hashing, Timestamp & Verification Technology
description: Explore hashing, timestamp sources, blockchain anchoring, certificate fields and independent verification.
canonical: https://proofit.biz/technology
entity: ProofIt
last_updated: 2026-08-12
---

# How ProofIt Technology Works

ProofIt uses cryptographic hashing, RFC 3161 trusted timestamps, and Ethereum blockchain records to create verifiable evidence of when digital content existed in a particular form.

## SHA-256 hashing

ProofIt generates a SHA-256 fingerprint of file content. Only the hash—not the original file—is sent to external timestamping and used for blockchain registration.

## RFC 3161 trusted timestamps

Where enabled, ProofIt requests a timestamp token from a Trusted Timestamp Authority (Sectigo). The signed token proves the hash existed at a specific UTC time and can be verified independently if retained.

## Ethereum anchoring

Relevant hash and certificate metadata are registered on Ethereum. Once written, that record is not deleted or reversed when a ProofIt subscription ends.

## Certificate fields

Typical fields: certificate ID, SHA-256 hash, Ethereum transaction reference, trusted timestamp and provider name where applicable, QR verification link.

## Independent verification

Third parties can verify certificates via https://proofit.biz/verify and related evidence. This supports existence, time, and integrity—not automatic legal ownership.

## Privacy

Original files are not published on-chain or sent to the TSA. See also https://proofit.biz/how-it-works and https://proofit.biz/security.