The Problem With Verifying Spreadsheets & Data Files
Spreadsheets containing financial projections, pricing models, or project plans are frequently shared and then disputed. Who had which numbers when becomes a critical question.
Altered documents in disputes, fraud cases, or compliance audits can have devastating consequences.
For analysts, accountants, project managers, data teams, this is not a theoretical risk — it is a daily reality. A startup shares financial projections with investors. The investors later claim different numbers were presented. Timestamped spreadsheets prove the exact figures that were shared.
How TimeProof Solves This
When you timestamp spreadsheets & data files with TimeProof, TimeProof uses client-side file hashing (SHA-256). That 64-character value is the unique fingerprint for the exact version you selected, and if even one byte changes, the hash changes too. Your file never leaves your device.
TimeProof proves file existence by anchoring file hashes to the Polygon blockchain. The blockchain records the hash, timestamp, and transaction ID permanently, so anyone can verify the record independently on Polygonscan without relying on editable metadata or a vendor-controlled database.
For analysts, accountants, project managers, data teams, that means proves a document is identical to the original using cryptographic hash comparison. timestamping spreadsheets preserves a snapshot of the exact data at a specific moment, proving the data existed in that form before any dispute about numbers arose.
Specific to Spreadsheets & Data Files
Timestamping spreadsheets preserves a snapshot of the exact data at a specific moment, proving the data existed in that form before any dispute about numbers arose. Common file formats include XLSX, CSV, ODS, NUMBERS, TSV, and TimeProof handles all of them. Whether you are using Excel, Google Sheets, LibreOffice, Numbers, the workflow is the same.
The Metadata Problem
Many people assume file metadata is sufficient proof. It is not.
Excel metadata shows last-modified date but not a reliable creation timestamp. Google Sheets version history requires account access. CSV files have no metadata at all.
A blockchain timestamp is independent of your file’s metadata. It is stored on the public Polygon blockchain, which no one controls. Even if every byte of metadata is stripped, your timestamp remains permanent and verifiable.
Step-by-Step: Verifying Your Spreadsheets & Data Files
Anchor the reference version before it circulates so any later copy can be compared against the original hash. Best used when a file becomes the reference original or enters sensitive review. Common files in this workflow include signed originals, released exports, and archived master files. Typical reviewers or counterparties include auditors, investigators, and counterparties.
- Select the original version you may later need to defend as complete and unaltered.
- Timestamp that exact file before copies are distributed, filed, or archived.
- Use the certificate and Polygonscan link as the reference record when comparing later copies.
- Timestamp any legitimately amended version as a new official reference instead of overwriting the original proof.
Step 1: Select your file. Open TimeProof and drag your file onto the upload area. TimeProof accepts XLSX, CSV, ODS, NUMBERS, TSV and every other file format. The SHA-256 hash is computed entirely in your browser — your file never leaves your computer.
Step 2: Choose your timestamp type. Use scheduled timestamps for 1 credit per file, or use verified instant timestamps for 2 credits per file when immediate anchoring matters. Both produce permanent, identical proof.
Step 3: Confirm and anchor. Click the timestamp button. TimeProof computes the SHA-256 hash locally, sends it to the Polygon blockchain smart contract, and returns your proof. You pay zero gas fees — TimeProof covers all blockchain costs.
Step 4: Download your proof. You receive a PDF certificate and a direct link to the blockchain transaction on Polygonscan. Verified instant timestamps add a verified identity badge, and Legal-Grade adds the Courtroom-Ready PDF, JSON metadata, JWS identity attestation, and Complete Evidence ZIP.
Step 5: Add Legal-Grade if needed. Legal-Grade is a verified per-batch upgrade. Starter and Pro charge 50 credits for up to 25 files, then +2 credits per file after 25. Business charges 25 credits for up to 25 files, then +1 credit per file after 25. Enterprise includes Legal-Grade. It adds the Courtroom-Ready PDF, JSON metadata, JWS identity attestation, and Complete Evidence ZIP.
What You Receive
Every TimeProof timestamp for spreadsheets & data files includes:
- PDF certificate - a readable proof document for the exact spreadsheets & data files you timestamped, ready to keep with the project or share when timing becomes disputed.
- Polygonscan link - direct public verification of the on-chain hash, timestamp, and transaction.
Verified instant timestamps also include: 3. Verified identity badge - the certificate shows the timestamp was created by a verified account, which is useful when delivery timing, authorship, or submitter identity may later matter.
With the Legal-Grade upgrade, you also receive the core evidence-package components documented by TimeProof: PDF, JSON, JWS identity attestation, and a ZIP bundle.
- Courtroom-Ready PDF - a presentation-ready evidence certificate for disputes around verify it has not been tampered with, payment, originality, or formal review.
- JSON Metadata - machine-readable timestamp data for technical teams, audit trails, or structured evidence review.
- Identity Attestation (JWS) - a signed proof that ties the timestamp to a verified identity and can be verified through /.well-known/jwks.json.
- Complete Evidence ZIP - one bundle containing the Courtroom-Ready PDF, JSON Metadata, Identity Attestation (JWS), and supporting proof materials so counsel, clients, or reviewers can inspect the complete record in one place.
Why Blockchain vs Other Methods
TimeProof uses Polygon because analysts, accountants, project managers, data teams need proof that is fast to create, inexpensive to repeat, and easy for third parties to verify.
TimeProof proves file existence by anchoring file hashes to the Polygon blockchain. This gives reviewers a public record they can inspect independently on Polygonscan.
- Speed: about 2-second block times when verified instant proof matters.
- Cost: users do not buy crypto or manage gas fees because TimeProof covers blockchain costs.
- Public verification: counterparties, clients, auditors, or counsel can inspect the record independently on Polygonscan.
- Security: the record sits on a public, tamper-resistant network aligned with Ethereum.
- Permanence: the timestamp remains verifiable long after the spreadsheets & data files have been shared, reposted, or challenged.
Real-World Scenario
A team needs to show that a file in circulation matches the original reference copy rather than a later edited or tampered version. The files at issue are often signed originals, released exports, and archived master copies. Typical reviewers or counterparties include auditors, counsel, and investigators.
A startup shares financial projections with investors. The investors later claim different numbers were presented. Timestamped spreadsheets prove the exact figures that were shared.
A reviewer suspects post-signature changes, a dispute raises tampering allegations, or copied files no longer match the official record. The original timestamped hash becomes the reference point, so later comparisons can show whether the file still matches the known-good original.
Related Comparisons
These comparisons help you measure this proof path against common alternatives that solve part of the problem but not the full timing-and-integrity chain.
- TimeProof vs Manual SHA256: Compare one-off checksum checking with a workflow that preserves an independently verifiable original reference.
- TimeProof vs Cloud Storage Timestamps: See why provider metadata does not replace proof tied to the file contents themselves.
- TimeProof vs RFC 3161: Compare timestamp-authority models with broader blockchain proof when integrity challenges may surface later across teams or systems.
Related Guides
Use these related pages to go deeper on the legal, verification, or pricing context behind this workflow.
- Document Version for Legal Documents: Pair tamper detection with milestone version proof when disputes turn on which file revision was authoritative.
- Preserve Chain of Custody for Legal Documents: Extend integrity checking into custody-aware handling when originals move across reviewers or formal evidence chains.
- How Blockchain Timestamping Works: Review the technical model that makes later file comparison possible.
Pricing
TimeProof uses one unified credit balance, so you can verify spreadsheets & data files as part of normal work instead of waiting for a dispute.
- Scheduled timestamps: 1 credit per file - available to everyone, with proof available within 6 hours.
- Instant timestamps: 2 credits per file - available to verified subscribers, anchored in about 2 seconds.
- Legal-Grade: Starter and Pro: 50 credits up to 25 files, then +2/file. Business: 25 credits up to 25 files, then +1/file. Enterprise: included.
One-time packs start at $15 for 100 credits. Verified monthly plans start at $19/month and include identity verification for instant timestamps and Legal-Grade.
Timestamp key business spreadsheets using 1 scheduled credit each. Twelve monthly models would use 12 credits per year. Use scheduled timestamps for routine protection, verified instant timestamps when timing must be immediate, and Legal-Grade when the record may be challenged formally.
For spreadsheets & data files, the cost is based on the number of files you anchor, not the file size. Scheduled timestamps use 1 credit per file, while verified instant timestamps use 2 credits per file.
Privacy
Your spreadsheets & data files never leave your computer. TimeProof uses client-side file hashing (SHA-256). Only the 64-character hash string is sent for anchoring. Because SHA-256 is one-way, it is not possible to reconstruct the original file from the hash. That lets analysts, accountants, project managers, data teams protect client work, unpublished material, and high-value source files without exposing the underlying content.