Umarise
Anchor any file to Bitcoin to prove it existed at a specific time
Last verified:
What is Umarise?
Umarise’s proof-of-existence tool anchors files, data, models, and artifacts to Bitcoin using OpenTimestamps so you can prove a file existed at a specific moment. It is positioned as an independent, tamper-resistant proof layer rather than just an internal audit trail, and it is designed to work even without trusting Umarise itself.
The tool emphasizes content-blind verification: it does not store the file contents, only a cryptographic proof that can be checked later. The website says the workflow can be integrated in about 12 lines of YAML or used through the CLI, making it suitable for teams that want to add proof-of-existence to CI/CD or other automation without changing their core application code.
It is aimed at developers, teams shipping AI-generated code or artifacts, and anyone who needs evidence that a file existed at creation time for disputes, compliance, or provenance. The site frames it as infrastructure for anchoring-by-default, where evidence is created at the moment of capture rather than reconstructed later.
The product also highlights offline verification, zero data storage, and independence from the company as core design goals. Based on the site, it is most useful where integrity, timestamping, and external verifiability matter more than content storage or file hosting.
Umarise pricing
Pricing model: Freemium
The website content available here does not show detailed pricing tiers, free limits, or paid plan inclusions for this tool. It emphasizes the core workflow, verification model, and integration options, but no explicit free tier or subscription breakdown is visible from the accessible page content. Based on the site material, verification is presented as free to anyone with the proof file, while pricing for creation or platform access is not stated on the page we could access.
Umarise pros
- Anchors files to Bitcoin
- Uses OpenTimestamps
- Proves existence at a specific time
- Independent of Umarise’s own trust
- Tamper-resistant proof layer
- Content-blind verification
- Zero data storage
- Does not store file contents
- Offline verification support
- No account required to verify
- No API key required to verify
- Simple YAML integration
- CLI support for direct use
- Works with files, data, models, and artifacts
- Suitable for CI/CD automation
- Designed for creation-time anchoring
- Useful for dispute evidence
- Built for provenance workflows
- Can be integrated without touching app code
Umarise cons
- Does not preserve the original file
- Requires anchoring at creation time
- Cannot retroactively prove past existence
- Depends on Bitcoin/OpenTimestamps infrastructure
- Proof only covers existence, not authenticity of authorship
- Not a file hosting or backup service
- Not useful if you forget to anchor before the event
- Verification still requires proof files or verification data
- Focused on technical users and developers
- No content recovery from the proof itself
Frequently asked questions about Umarise
What does this tool actually prove?
It proves that a file, artifact, or similar data existed at the time it was anchored. The proof is cryptographic and timestamped through Bitcoin via OpenTimestamps, so the result is evidence of existence at a moment in time rather than a claim about the file’s contents or meaning.
Does Umarise store my files?
No. The website describes the system as content-blind and says it uses zero data storage, which means it stores a cryptographic proof rather than the file itself. That design is meant to preserve privacy and reduce trust in the service operator.
How is the proof created?
The site says the file is anchored to Bitcoin using the OpenTimestamps engine. In practice, that means the file is hashed and the hash is included in a timestamping process that later allows independent verification.
Can I verify the proof without using Umarise’s servers?
Yes. The website emphasizes independent verification and offline verification, which means the proof can be checked without needing to trust the company at verification time. That is part of the product’s positioning as a neutral proof layer.
Can I use it in CI/CD or automation?
Yes. The page specifically frames the workflow as easy to integrate and mentions a YAML-based setup, which makes it suitable for automated pipelines. It is also presented as useful for anchoring code, models, and artifacts at the moment they are created.
Do I need an account or API key to verify a proof?
No. The site explicitly says verification is available without an account and without an API key. That makes the proof portable and easier to share with third parties who need to confirm it.
What kinds of things can be anchored?
The site mentions files, data, models, artifacts, and AI-generated commits as examples. The general idea is to anchor any digital object where proving time of existence matters.
What is the main limitation of this approach?
The main limitation is timing: you must anchor at the moment of creation if you want strong evidence. The website states that retroactive proof is logically impossible, so a file that was not anchored earlier cannot later be proven the same way.
Is this a replacement for backups or file storage?
No. The tool is for proof of existence, not preservation of the file contents themselves. If you need to recover, edit, or store the original file, you still need a separate storage or backup system.
Who is this tool best for?
It is best for developers, AI teams, and organizations that need independent evidence that a digital file existed at a given time. The site especially targets workflows where provenance, dispute handling, and tamper-resistant timestamping matter.