Why Create Evidence Before Sharing a File?
Before sharing an important file, preserve the exact version and the records that explain it.
Files can be copied, edited or redistributed after sharing. A timestamped fingerprint gives you an external reference for the saved version, while delivery records, agreements and project history provide additional context.
Timestamping supports prior existence of a matching file by the recorded time. It does not establish authorship, ownership or delivery, and it does not eliminate disagreements.
Keep a Reference for the Version You Share
File metadata and cloud history may provide useful context, but they can change during editing, copying or export. Preserve the original and related records. A timestamp adds an external fingerprint reference without determining the legal value of the other evidence.
Certelo calculates a SHA-256 fingerprint in your browser without uploading the file, then registers it with blockchain evidence. Anyone can inspect the public reference. To connect it to a particular file, a reviewer must calculate that file’s fingerprint and compare it with the registered value. A match supports prior existence, not authorship.
Where This Actually Matters
It's easy to think of timestamping as something only lawyers or big companies need. In reality, the situations where pre-sharing evidence matters are everyday ones:
• A freelance designer sends concept art to a client before a contract is signed, and later needs to prove the design existed before the client's in-house team "came up with something similar."
• A developer shares a code snippet or technical proposal and wants a dated reference for that version. This is different from proving code ownership on the blockchain, which a timestamp cannot establish.
• A songwriter or artist preserves and timestamps a rough demo before sharing it with a producer. This does not register or confer copyright.
• A business sends a signed PDF contract, invoice, or compliance report and needs to timestamp the PDF for legal proof in case the document's authenticity is questioned during an audit.
• An insurer or policyholder documents the condition of a property or asset pre-loss document timestamping that may be one reference in a later review. Timestamping does not certify the condition described or determine a claim.
The record can establish only an upper time reference for the matching file: when it was registered. A timestamp created after sharing cannot retrospectively prove that the file existed before that later timestamp.
Keep Provenance and Compliance Questions Separate
Organisations may have obligations under legislation such as the EU AI Act, but a timestamp does not establish compliance, disclose AI use automatically or distinguish human work from AI generation. Keep provenance, identity and process records separately and assess applicable requirements on their own terms.
Data integrity verification, in other words, isn't just a legal safety net anymore. It's part of how trust gets built into digital workflows from the start.
What "Creating Evidence" Actually Looks Like
Use Certelo’s available browser flow. Do not assume a secure timestamp API or integration is available. The basic steps are:
1. Select the file. Certelo calculates its SHA-256 fingerprint on your device without uploading the original.
2. That fingerprint is timestamped and anchored to a blockchain record.
3. Check confirmation and preserve the certificate and blockchain references with the exact original file.
A reviewer can compare the file’s fingerprint with the record. Identity, authorship, custody and the truth of its contents still require separate evidence.
The Real Cost of Waiting
The problem with creating evidence after a dispute starts is limited to the later recorded time. It cannot retrospectively establish prior existence at an earlier date, and Certelo does not predict how a court or reviewer will weigh it.
Preserve important versions at meaningful checkpoints. Follow the confirmation status and keep the proof references with the original; processing and network confirmation times can vary.
If a file matters enough to share, it matters enough to timestamp first.