Creating Spreadsheets & Data Files

The Problem With Creating 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.

Without admissible evidence, even a strong case can fail. Legal-Grade timestamps prepare evidence before you need it.

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 produces a Legal-Grade evidence bundle that satisfies Federal Rules of Evidence for digital records. 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: Creating Your Spreadsheets & Data Files

Timestamp the operative file before formal review and use the verified Legal-Grade upgrade when the matter needs a self-contained evidence package rather than a bare certificate. Best used before filing, sending a demand package, or handing digital records to counsel, regulators, or expert reviewers. Common files in this workflow include complaint exhibits, demand letter attachments, and evidence exports. Typical reviewers or counterparties include counsel, regulators, and arbitrators.

1. Finalize the exact file or exhibit package that may face formal scrutiny.
2. Timestamp that file while the operative version is clear.
3. Add the verified Legal-Grade upgrade when the matter calls for the Courtroom-Ready PDF, JSON metadata, JWS identity attestation, and Complete Evidence ZIP.
4. Store the resulting evidence package with the legal or compliance record and repeat for later operative versions if the matter changes.

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:

1. 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.
2. 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.

4. Courtroom-Ready PDF - a presentation-ready evidence certificate for disputes around create courtroom-ready legal evidence, payment, originality, or formal review.
5. JSON Metadata - machine-readable timestamp data for technical teams, audit trails, or structured evidence review.
6. Identity Attestation (JWS) - a signed proof that ties the timestamp to a verified identity and can be verified through /.well-known/jwks.json.
7. 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 matter is moving from informal argument into court, arbitration, regulatory review, or another stage where the evidence package itself will be examined. The files at issue are often complaint exhibits, demand letter attachments, and evidence exports. Typical reviewers or counterparties include counsel, regulators, and arbitrators.

A startup shares financial projections with investors. The investors later claim different numbers were presented. Timestamped spreadsheets prove the exact figures that were shared.

Counsel prepares for filing, an arbitrator or regulator requests supporting records, or a dispute moves from informal negotiation into formal scrutiny. The timestamp and verified Legal-Grade package create a cleaner chain from the exact file to a self-contained evidence set that is easier to hand to third parties.

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 Notarization: Compare witness and signature-centric attestation with a file-specific package built for digital evidence review.
• TimeProof vs RFC 3161: Compare traditional timestamp-authority models with a broader blockchain proof package for formal scrutiny.
• TimeProof vs DocuSign: See why signing workflows do not automatically provide the same evidentiary package for the underlying file contents.

Related Guides

Use these related pages to go deeper on the legal, verification, or pricing context behind this workflow.

• Legal-Grade Certificates Explained: Review what the verified Legal-Grade package adds when a file may face formal third-party scrutiny.
• Preserve Chain of Custody for Legal Documents: Pair the evidence package with stronger custody handling when exhibits move through counsel, reviewers, or regulators.
• Pricing: Review the current plan and credit model for recurring legal-evidence workflows.

Pricing

TimeProof uses one unified credit balance, so you can create 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.