What are the best alternatives to OpenTimestamps?Free command-line proofs, and tools that do a similar job in a browser

TimeBinder adds a layer of protection against AI and human fraud and disputes.

The file stays on your device. Your browser makes a digital fingerprint of the file. TimeBinder records the fingerprint and the time, not the file.

Short answer

OpenTimestamps is a free, open-source way to anchor a file’s fingerprint in Bitcoin, usually from the command line. Common alternatives include TimeBinder (browser-based; first Pooled TimeBind free, then from US$5), OriginStamp, and the original Proof of Existence service. They all date a fingerprint. They do not prove authorship or that the contents are true.

There is no single best alternative

The “best” option depends on whether you want a free command-line proof, a browser certificate, or an API. OpenTimestamps remains a solid choice if you are comfortable at the command line and want an open-source Bitcoin proof. A side-by-side list is in OpenTimestamps alternatives and TimeBinder vs OpenTimestamps.

Other tools that date a file hash on a public chain include the original Proof of Existence service and OriginStamp (see TimeBinder vs OriginStamp). Free blockchain timestamp options explains what you get for nothing. For website content rather than a file you hold, see WordProof alternatives.

Where TimeBinder fits

TimeBinder makes the SHA-256 fingerprint in your browser, keeps the file on your device, and issues a Proof of Time certificate. The first Pooled TimeBind is free, then from US$5; an ASAP TimeBind is US$15. Like OpenTimestamps, it shows that an exact file existed no later than a recorded time and still matches. It does not show who made the file, who owns it, that the contents are true, or whether AI was used.

Make a TimeBind: first one free →

First Pooled TimeBind free, no card, then from US$5. An ASAP TimeBind is US$15.

Frequently asked questions

Is TimeBinder a drop-in replacement for an .ots proof?

No. A TimeBind is a different certificate, checked in TimeBinder. An OpenTimestamps .ots file is verified with OpenTimestamps tools. They both date a fingerprint, but the proof formats are not interchangeable.

Is there a completely free alternative?

OpenTimestamps itself is free. TimeBinder’s first Pooled TimeBind is also free, with no card. OriginStamp and Proof of Existence have their own plans; we do not invent fees we could not confirm on an official page.

Do these alternatives prove I wrote the file?

No. They show that an exact file existed no later than a recorded time and still matches. They do not show authorship, ownership, or that the contents are true.

What about WordProof?

WordProof is aimed at website content, often automatically, rather than a file you hash in the browser. See WordProof alternatives if that is the job you need.

Sources

OpenTimestamps, opentimestamps.org.
TimeBinder pricing: first Pooled TimeBind free, then from US$5; ASAP US$15.

Related guides and tools

Your file’s fingerprint, anchored to a global network secured by real electricity and cryptography.

Editing a file—including with AI—changes its fingerprint, not its existing network record.

How this works

Your file’s SHA-256 fingerprint, a short code worked out from its exact contents, is made in your browser, and the file itself stays on your device. A cryptographic commitment to that fingerprint, which may be combined with others, is then anchored in a block on the Bitcoin blockchain. Bitcoin is secured by proof of work: computers around the world spend real electricity to add each block, and changing an earlier block would mean redoing that work faster than the rest of the network. Until that block is confirmed, your proof is pending. Once the Bitcoin anchoring is confirmed, you can verify the proof against that recorded commitment. The confirmed record can then be checked; Pooled TimeBinds are checked through TimeBinder, while ASAP TimeBinds can also be checked independently. If you check the file later and its fingerprint still matches, that shows the file existed no later than the recorded time. The record doesn’t show who made the file, whether AI was used, or that its contents are true.

Your filestays on your device
FingerprintSHA-256
Network timestampon Bitcoin

Record a fingerprint of the file you rely on

Add a layer of protection against AI and human fraud and disputes: a dated, checkable record of the exact file you hold.

Open the app and sign in with email or Google.
Add your files. They stay on your computer.
Seal them and download your Proof of Time certificates.

Open TimeBinder →

First Pooled TimeBind free, no card, then from US$5. See pricing.