Why Proving a File’s Existence Date Matters
Imagine you’re a photographer, and someone publishes your image claiming it’s theirs. Or you’re a songwriter, and a collaborator releases your unreleased track. Or you’re a researcher, and a competing lab publishes findings suspiciously similar to your unpublished data.
In every case, the question is the same: who had this file first?
Without proof, it’s your word against theirs. Courts, mediators, and platforms like Instagram or YouTube need something stronger than “trust me, I made this.”
That’s where timestamping comes in. A blockchain timestamp creates a permanent, tamper-proof record proving your file existed at a specific moment in time. Not because a company says so — but because cryptographic math and a public blockchain say so.
How Blockchain Timestamping Works
Here’s what happens behind the scenes when you timestamp a file with TimeProof:
Step 1: Your file gets a unique fingerprint
When you select a file, TimeProof runs it through the SHA-256 hashing algorithm — the same standard used by Bitcoin, Git, and TLS/SSL connections.
Think of it like a fingerprint: just as your fingerprint is unique to you, a file’s SHA-256 hash is unique to that exact file. Change one pixel in a photo, one character in a document, or one byte in any file — and the hash changes completely.
This is a one-way process. You can always compute the hash from the file, but you can never reconstruct the file from the hash. Your file’s contents remain completely private.
Step 2: The fingerprint goes on the blockchain
TimeProof submits your file’s hash to a smart contract on the Polygon blockchain. Polygon is a Layer 2 Ethereum network used by organizations like Aave, Uniswap, Stripe, and Reddit. It offers ~2-second block times and costs fractions of a cent per transaction.
The smart contract writes three things permanently:
- Your file’s SHA-256 hash
- The blockchain timestamp (block time)
- A transaction ID you can look up on any Polygon block explorer
Once written, no one can change or delete this record — not TimeProof, not any government, not anyone. That’s the fundamental property of blockchain: immutability.
Step 3: You get verifiable proof
If you ever need to prove your file existed on a specific date, you provide two things:
- The original file
- Your timestamp certificate (which includes the transaction ID)
Anyone can then:
- Re-hash the file to get the SHA-256 fingerprint
- Look up the transaction on Polygonscan
- Confirm the on-chain hash matches the re-computed hash
- See the exact date and time it was recorded
If the hashes match, the file is mathematically proven to be identical to what was timestamped. No alterations, no tampering, no ambiguity.
What Makes This Different from Other Methods
”Can’t I just email myself a copy?”
This is the “poor man’s copyright” myth. Mailing or emailing yourself a file doesn’t create legally recognized proof of anything. Email dates can be manufactured, envelopes can be resealed, and no court treats self-addressed mail as reliable evidence. It has no legal standing.
”Can’t I just take a screenshot with a timestamp?”
Screenshots prove nothing — they can be edited in seconds. A screenshot of a calendar, a clock, or a file’s “Date Modified” property isn’t evidence. Any metadata examiner knows these fields are trivially altered.
”What about just saving the file and relying on the Modified Date?”
File system timestamps (Created, Modified, Accessed) are stored locally and can be changed with a single command. They’re not proof — they’re metadata that anyone with file access can alter.
Blockchain timestamping is different because:
- The hash is computed from the file’s actual contents, not metadata
- The timestamp comes from the blockchain, not your computer’s clock
- The record is on a public ledger that millions of nodes verify
- Anyone can independently verify without contacting TimeProof
- The record is permanent — it can’t be altered after the fact
When You Need Legal-Grade Proof
For everyday protection, a standard timestamp gives you everything you need: a PDF certificate and direct Polygonscan link for independent verification.
But when the stakes are higher — a lawsuit, an insurance claim, patent defense, or regulatory audit — you want the Legal-Grade upgrade.
The Legal-Grade package adds the courtroom-ready layer on top of your standard timestamp:
- Courtroom-Ready PDF — human-readable certificate for counsel, courts, and auditors
- JSON metadata — machine-readable verification data
- Identity Attestation (JWS) — signed proof tied to the verified account
- Polygonscan link — direct public blockchain verification
- Complete Evidence ZIP — bundled evidence package with supporting proof materials
The result is a self-contained evidence binder. Your lawyer doesn’t need to contact TimeProof. They don’t need special software. They follow the verification guide and confirm everything independently.
What This Costs
Protecting your files starts with one-time packs at $15 for 100 credits:
- Scheduled timestamps — 1 credit per file
- Verified instant timestamps — 2 credits per file
- 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.
- Monthly plans — start at $19/month and include identity verification
Pack credits do not expire, and TimeProof covers Polygon gas internally.