Create immutable Proof of Existence on the Polygon network
Select your audio (MP3, WAV) or any other digital file. For better metadata protection and multi-file projects, we highly recommend using a ZIP archive (read why in the FAQ).
Choose a file from your device or simply drag it into the field with the Cloud icon. Please note: only one file can be processed per registration.
Your browser calculates a unique SHA-256 digital fingerprint locally. The original file is never uploaded to our servers, meaning we absolutely cannot see, access, or store your content.
We anchor your hash to the Polygon network to create a secure, tamper-proof timestamp. Once the transaction is confirmed, a “Certificate” button will appear for your PDF download.
You have created a permanent, immutable record of your file's existence at this specific moment on the blockchain.
Hashing...
Your file is registered. Click below to save your certificate.
Blockchain verification requires an exact byte-for-byte match. Any change—even re-saving or modifying hidden metadata—will create a new hash, rendering the original proof invalid.
Purchase credits instantly. Codes never expire. Use them one by one whenever you are ready.
Perfect for single & cover.
Ideal for EPs & Albums.
Maximum savings.
Instantly compare your file with a blockchain-recorded hash.
Drag & Drop or Click to Select
Awaiting file and hash comparison...
Effective Date: February 21, 2026 | Version: 2026.1
1.1. Technical Interface: ProoFiles (the "Service") is a web-based technical tool that allows users to generate cryptographic hashes of their files locally and broadcast them to the Polygon blockchain.
1.2. No Custody & Zero-Knowledge: The Service utilizes client-side technology. Your original files are never uploaded to our servers. We do not store, possess, or have access to your original content.
1.3. Not a Government Registry: The Service provides technical proof of existence (timestamping). It is not a substitute for official copyright or patent registration with government authorities.
2.1. Credit-Based Access: Access to the timestamping functions requires "Credits" or "Access Codes."
2.2. Pre-paid Digital Goods: Credits are digital utility units. By purchasing Credits, you request and provide express consent for the immediate supply of digital content.
2.3. No Refunds: Due to the nature of digital goods, all purchases of Credits are final. You expressly waive your right of withdrawal (including the 14-day cooling-off period under EU/UK consumer law) once the Credits are added to your account or Access Code is delivered.
2.4. Credit Consumption: One credit is consumed upon the initiation of a blockchain broadcast request, regardless of the ultimate success of the transaction on the network.
2.5. Service Lifespan & Expiration: While Credits do not have a set calendar expiration date ("Never Expires"), they are valid only for the operational lifetime of the Service. ProoFiles reserves the right to sunset, discontinue, or terminate the Service at any time, for any reason. In the event of Service termination, any unused Credits will be permanently forfeited without refund.
3.1. Immutability: You acknowledge that once a hash is broadcast to the Polygon network, it becomes permanent and cannot be deleted, modified, or retracted.
3.2. Network Dependency: ProoFiles does not own or control the Polygon network. We are not liable for network congestion, gas fee spikes, forks, or failures of the Polygon consensus mechanism.
4.1. File Retention: You are 100% responsible for keeping the original, unmodified file. If you lose the file or change a single bit, the blockchain record will not match and cannot be recovered.
4.2. Legality of Content: You warrant that you own or have the rights to the files you hash. You shall not use the Service to timestamp illegal, extremist, or infringing material. Liability rests entirely on you.
TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE TOTAL LIABILITY OF PROOFILES FOR ANY CLAIM SHALL NOT EXCEED THE AMOUNT YOU PAID FOR THE CREDITS IN THE LAST 12 MONTHS OR $10 USD, WHICHEVER IS GREATER. WE ARE NOT LIABLE FOR LOST PROFITS, LOSS OF DATA (INCLUDING ORIGINAL FILES), OR ANY INDIRECT DAMAGES RESULTING FROM THE USE OR INABILITY TO USE THE SERVICE OR THE POLYGON NETWORK.
These Terms shall be governed by and construed in accordance with the laws of England and Wales. Any disputes shall be settled exclusively in the courts of London, UK.
Effective Date: February 21, 2026 | Version: 2026.1
1.1. No Content Access: ProoFiles operates on a strict "Zero-Knowledge" basis. We do not upload, view, store, or have any access to the original files you process.
1.2. Local Processing: All cryptographic hashing occurs locally in your browser (client-side). Only the resulting hexadecimal string (the "Hash") is transmitted to our interface for blockchain broadcasting.
2.1. Technical Metadata: To provide the Service, we process the Cryptographic Hashes of your files, blockchain transaction IDs, and standard web analytics (like anonymized IP addresses for security and fraud prevention).
2.2. Payment Information: We do not store credit card details. All payments are securely processed by authorized third-party providers. They act as independent Data Controllers.
3.1. Permanent Records: You acknowledge that once a Hash is broadcast to the Polygon network, it becomes a permanent public record. It cannot be deleted, modified, or altered by us or anyone else.
3.2. Personal Data Warning: You are strictly prohibited from hashing files that contain sensitive Personal Identifiable Information (PII) if you intend to exercise a "Right to Erasure" later. We cannot delete data from the Polygon blockchain.
3.3. Right to Erasure: Under GDPR, you have the right to request deletion of your data from our internal databases. However, this does not extend to the immutable blockchain ledger.
We use essential cookies strictly necessary to maintain your session, manage your Credit balance, and log your acceptance of these legal agreements. We do not use intrusive third-party advertising or cross-site tracking cookies.