Timestamp GIT vs OpenTimestamps: Managed vs DIY

The timestamp git vs opentimestamps decision comes down to one thing: do you want to run timestamping infrastructure, or do you want to consume timestamping as a service?

Timestamp GIT takes the OpenTimestamps protocol and hides the operational complexity behind a GitHub App, automatic nightly anchoring, a web dashboard, badges, and a REST API. Raw OpenTimestamps gives you the same underlying cryptographic primitive — SHA-256 hashes anchored into the Bitcoin blockchain — but expects you to handle hashing, batching, scheduling, receipt storage, and verification yourself.

Both approaches produce .ots receipts that prove your Git commit history existed before a specific Bitcoin block. The difference is whether you or a managed service is responsible for producing them reliably.

The Choice: Managed Timestamping vs. DIY OpenTimestamps

The buying decision is straightforward. You need cryptographically undeniable proof that a Git commit existed on a given date. The raw protocol can do that. A managed service built on that protocol can also do that. The trade-off is:

• Timestamp GIT: automation, ease, compliance-ready evidence, vendor-operated infrastructure, paid tiers for private repos.
• OpenTimestamps: full control, open-source transparency, zero licensing cost, but manual tooling and custom automation.

For many teams, the right evaluation is not “which one is cryptographically stronger?” because the Bitcoin anchoring math is the same. The right evaluation is “which one will still be producing receipts, badges, and audit reports six months from now without someone on the team babysitting a cron job?”

That is the comparison this article walks through.

The Landscape: Two Paths to Bitcoin-Anchored Proof

OpenTimestamps is an open-source protocol for anchoring data hashes into the Bitcoin blockchain. It uses SHA-256 and Bitcoin block data to create timestamp proofs. The core output is an .ots receipt. It is not a managed product; you install tooling, decide what to hash, and run the process yourself. It has no dashboard, no badge generator, and no repo integration by default. Verification is similarly manual: you run protocol tooling against Bitcoin block data.

Timestamp GIT is a managed SaaS + GitHub App built on top of OpenTimestamps. You install the GitHub App once. From then on, every commit to a monitored repository is detected automatically, batched in a nightly manifest, combined into a Merkle tree, anchored into Bitcoin via public OTS calendars, and returned as proof to a dedicated branch or shadow repository. There is no CLI to install on developer machines. There is no cron to maintain. The product also offers a Docker self-hosted option for environments that require the managed workflow inside their own infrastructure.

Both paths create .ots receipts anchored in the Bitcoin blockchain. The proof format and cryptographic guarantees are fundamentally the same. The user experience and operational surface area are not.

Selection Criteria: What Matters for Developers and Compliance

Ease of setup and ongoing use

Timestamp GIT requires installing the GitHub App and connecting repositories. No local tools, no scheduler, no receipt storage to manage. One nuance: because GitHub does not offer commit-hash-only permissions, the GitHub App in standard mode asks for read-only access to the source repo — but it only reads the HEAD commit hash. It also needs read-write access to the target proof repo or branch where receipts are written.

OpenTimestamps requires installing protocol tooling, writing scripts, scheduling jobs, and storing receipts. That is not hard for a single repository, but it becomes real maintenance across an organization.

Automation and reliability

Timestamp GIT handles the full pipeline:

1. Commit detection via GitHub webhooks or a GitHub Action.
2. Hash queuing in an in-memory key-value store.
3. A nightly worker groups pending hashes into manifest files, builds a Merkle tree, creates OpenTimestamps proofs, and anchors the Merkle root into Bitcoin.
4. Proof delivery after Bitcoin confirmation, which normally takes a few hours.

OpenTimestamps has no built-in automation. Commit detection, batching, scheduling, and receipt delivery are all on you.

Security and zero-knowledge

Both approaches can be zero-knowledge. Timestamp GIT never sees, copies, or stores your source code. In standard mode, the GitHub App reads only the HEAD commit hash. In Enterprise ZK mode, a GitHub Action runs on your infrastructure and pushes only the commit hash to the Timestamp GIT API. Your source never leaves your environment.

Raw OpenTimestamps lets you hash locally and timestamp only the digest. The difference is that Timestamp GIT has already operationalized that boundary with a GitHub App permission model and an HMAC-protected ZK API.

Integration with existing workflows

Timestamp GIT fits into GitHub workflows out of the box. It provides:

• README verification badges
• Public status dashboards with Bitcoin block and transaction data
• Audit CSV exports
• PDF certificates per date
• REST API endpoints for status, badges, verification, and reports

Private repository badge URLs append an encrypted HMAC so only authorized users can see status. OpenTimestamps provides raw .ots files; turning those into badges, dashboards, or compliance exports requires custom tooling.

Self-hosting with Docker

If you need the managed workflow but must keep everything in-house, Timestamp GIT is also available as a Docker image:

services:
  timestampgit:
    image: rue1401/timestampgit:prod
    ports:
      - "8080:8080"
    volumes:
      - ./data:/app/data
    restart: unless-stopped
  valkey:
    image: valkey/valkey:8
    restart: unless-stopped

docker compose pull
docker compose up -d
docker compose logs -f timestampgit

The application is available at http://localhost:8080 after startup. On first launch, a setup wizard guides you through connecting your GitHub App and configuring your instance.

Pricing

Timestamp GIT has a free tier for public repositories, a Pro Agency plan at $49/month for private repos, and Enterprise ZK at $199/month for GitHub Actions-based zero-knowledge timestamping. A Docker self-hosted license is available through a demo license request.

OpenTimestamps is free open-source software, but the real cost is engineering time, scripts, monitoring, and the risk of a pipeline silently failing before you need the proof.

Side-by-Side Comparison: Timestamp GIT vs OpenTimestamps

Cryptographic strength is not a differentiator: both approaches use the same SHA-256 hashes and Bitcoin anchoring via the OpenTimestamps protocol. The proof is identical. The operational experience is not.

Verdict: Who Should Choose Which?

Choose Timestamp GIT if you want a zero-setup, automated solution that fits into GitHub workflows and produces compliance-ready evidence without learning the underlying protocol. This is the practical path for most startups, dev shops, freelancers, and internal teams.

Choose raw OpenTimestamps if you have specific technical requirements, want full control over every step of the timestamping process, and are comfortable managing infrastructure. This can make sense for protocol researchers, non-Git data, or custom batch pipelines.

Consider the Docker self-hosted option if you need the managed Timestamp GIT workflow but must keep everything in-house for air-gapped, security, or compliance reasons.

For most developers and compliance teams, Timestamp GIT offers the best balance of security, convenience, and legal defensibility.

FAQ

Is Timestamp GIT just a wrapper around OpenTimestamps?

Yes, Timestamp GIT uses the OpenTimestamps protocol under the hood to anchor commit hashes into the Bitcoin blockchain. However, it automates the entire process: you install the GitHub App, and every commit is automatically timestamped nightly without any manual CLI commands. The resulting .ots proofs are identical to those you would create manually.

Can I switch from raw OpenTimestamps to Timestamp GIT without losing my existing proofs?

Yes, your existing OpenTimestamps proofs remain valid because they are anchored in the Bitcoin blockchain. Timestamp GIT can start timestamping new commits from the point you connect your repository, and you can keep your old receipts for historical verification.

Does Timestamp GIT ever see my source code?

No, Timestamp GIT is designed to be zero-knowledge. In standard mode, the GitHub App only reads the HEAD commit hash, not the code itself. In Enterprise ZK mode, a GitHub Action runs on your infrastructure and pushes only the commit hash to the API, so your source code never leaves your environment.

Is the Bitcoin anchoring as secure with Timestamp GIT as with manual OpenTimestamps?

Yes, the security is identical because both use the same OpenTimestamps protocol and Bitcoin blockchain. Timestamp GIT batches multiple commit hashes into a Merkle tree and anchors the root in a Bitcoin transaction, just as you would manually. The difference is that Timestamp GIT handles the technical details for you.

Conclusion: Making the Right Choice for Your Prior Art

Timestamp GIT and raw OpenTimestamps both produce mathematically undeniable proof that your Git commits existed at a specific point in time. The underlying Bitcoin anchoring math is identical. The difference is operational: one is a managed GitHub App that automates the entire pipeline, and the other is a protocol you must run yourself.

If you value time, simplicity, and compliance-ready evidence, Timestamp GIT is the practical choice. You install the GitHub App once, connect your repositories, and let nightly anchoring do the rest — while your source code stays private.

Try Timestamp GIT free on public repositories, or explore the Docker self-hosted option if you need the same workflow inside your own infrastructure.

Related posts

• Automate Git Commit Timestamping with a GitHub App
• How to Prove Your Code Existed on a Specific Date (Without Revealing It)
• Protect Your Startup from Patent Trolls with Git Timestamping