Create timestamp proofs to prove your documents haven't changed.

When you upload a file, we create a unique fingerprint of it and permanently record it on the Bitcoin Ledger — a public record that no one can alter or delete. This can be used to prove your document existed in its specific state on a specific date and hasn't been changed since.

If someone modifies a document that was timestamped, the verification will show that the timestamp doesn't match the document, proving tampering occurred.

Our Team plan is specifically designed with law firms in mind. You can manage multiple clients, share documents & timestamps with clients, organize documents by clients, collaborate with team members, and provide timestamp proofs to your clients.

If you need assistance in deciding if this is the right service for you, you can schedule a demo with a representative.

We support Brave Browser, Chrome, Safari, and Firefox.

We recommend Brave Browser mostly for its enhanced security & privacy features.

When you delete a file from our platform, only the cloud-stored copy is removed. Your timestamp proof is not affected and remains available for download.

You can also choose to delete the timestamp, however this only removes the tracking of it on our platform. The Bitcoin blockchain record itself is permanent and cannot be altered or removed by anyone.

Bitcoin is the most secure, decentralized, and battle-tested blockchain in existence. It has the highest hashrate of any network, making it the hardest to tamper with, and has operated continuously since 2009 without downtime.

For timestamp proofs to be trustworthy, the underlying blockchain needs to be permanent and resistant to manipulation. Other blockchains may offer speed or lower costs, but none match Bitcoin's security and track record. The OpenTimestamps standard was specifically built on Bitcoin for these reasons.

Additionally, the US state laws recognizing blockchain records have primarily referenced Bitcoin's properties as the benchmark for reliability.

No. Only a cryptographic hash (like a digital fingerprint) is stored on the Bitcoin blockchain. Your actual document/file remains private and is never uploaded to the blockchain.

No. We handle all the technical aspects. You simply upload your document and download your timestamp proof.

Your timestamp proofs will remain valid forever. OpenTimestamps is an open-source standard. Anyone can still verify your files with your timestamp proofs using a compatible tool or their own Bitcoin node, even if our service no longer exists.

If we ever shut down, we will give all customers at least 90-day notice to download their documents from our cloud service ahead of time.

When you stamp a file, the timestamp will be marked as "Pending" while it waits to be included in a Bitcoin block. This typically takes a few hours.

Once confirmed in a Bitcoin Block, the file will be upgraded and the status changes to "Upgraded", meaning your timestamp is now permanently recorded on the Bitcoin blockchain. Our system handles this entire process automatically for you.

In simpler terms: think of "Pending" as your timestamp being submitted, and "Upgraded" as your timestamp being permanently sealed. Once upgraded, your proof exists on the Bitcoin blockchain and can be verified independently by anyone with the Timestamp proof, even without our platform.

No. Only the file's content is used during the verification process. The file name is not part of the cryptographic fingerprint. This allows you too freely rename your files without affecting the verification process.

Multiple US states, including Vermont, Arizona, and Ohio, among others, have passed laws recognizing blockchain records as legally valid.

Even in states without specific blockchain legislation, blockchain evidence is subject to the same Federal Rules of Evidence as other digital records. Rule 902, which covers self-authenticating evidence, applies broadly to certified electronic information, including blockchain records. Courts have shown a favorable disposition toward admitting it.

It's important to note that these laws recognize the blockchain as a valid method of record-keeping. As with all evidence, the content of a document is still subject to standard legal scrutiny. What LegalStampy proves is that a specific document existed in its exact form at a specific point in time, and that it has not been altered since.

Your timestamp proofs are anchored to the Bitcoin blockchain using the open-source OpenTimestamps standard, meaning they can be independently verified by anyone, including court-appointed experts.

Yes. Timestamps provide cryptographic proof that anyone can independently verify, including court-appointed digital foresnsics experts. They demonstrate that a document existed in its exact state on a specific date and has not been altered since.

Traditional forensic analysis requires experts to examine metadata, file system logs, and chain of custody, a process that can be time consuming, subjective, and expensive. With OpenTimestamps, verification is mathematical: either the document's fingerprint matches the blockchain record or it doesn't. This makes expert validation straightforward, reducing the time and cost involved if your proof is ever challenged.

Yes. We use encrypted connections and secure cloud storage. Your files are never available on the public blockchain.

Only a unique fingerprint (hash) of your file is recorded on the blockchain, which is all that is needed for verification.

For extra-sensitive documents, if you feel more comfortable you can also choose to stamp a file without storing it on our platform. You keep the only copy, and we just manage & upgrade your timestamp proof for it.

We require two-factor authentication (2FA) for all accounts to ensure only authorized users can access your documents. We also use enterprise-grade encryption, secure password requirements, and monitor for suspicious activity.