Clockdo generates verifiable content timestamps using OpenTimestamps. Prove when your content was first published — independently and cryptographically.
Get the WordPress Plugin Learn MoreEverything you need to create, manage, and verify content timestamps.
Each post generates a deterministic hash. Any change to the content produces a different fingerprint, ensuring tamper-evidence.
Your content hash is anchored to the Bitcoin blockchain via OpenTimestamps, providing a tamper-proof, independently verifiable timestamp.
Download .ots proof files and JSON manifests. Keep proof artifacts locally or share them for third-party verification.
Optionally inject verification meta tags into your post's HTML head. Useful for search engines and cache archives.
Automatically create a timestamp record every time you publish or update a post. No manual steps required.
View proof status, download files, and manage all your timestamps from a dedicated WordPress admin dashboard.
From publish to proof in four steps.
Write and publish your WordPress post as usual.
Clockdo creates a SHA-256 hash of your content and metadata.
The hash is submitted to the Clockdo API, which creates an OpenTimestamps proof anchored to the Bitcoin blockchain.
Download the .ots file and verify independently using standard OpenTimestamps tools.
All features are available to every user. Plans differ only in server-side rate limits and quotas — the plugin itself is fully free and open-source.
| Capability | Free | Pro (VIP) | Pro Plus (VIP+) |
|---|---|---|---|
| Daily submissions | 5 / day | Unlimited | Unlimited |
| Cooldown between submits | 10 minutes | None | None |
| Min post age for submit | 72 hours | Immediate | Immediate |
| Batch history window | 180 days | 365 days | 365 days |
| Auto-publish on post | ✓ | ✓ | ✓ |
| Auto-submit on update | ✗ (API rejects) | ✓ | ✓ |
| Draft submissions | ✗ (API rejects) | ✓ | ✓ |
| Proof retention | 90 days | 365 days | Unlimited |
The WordPress plugin sends all requests identically. The table above describes what the API server enforces. The plugin displays error messages returned by the API as-is. Learn more about Pro & start a trial →
Free and open-source. Available on the WordPress Plugin Directory.
The plugin communicates with the Clockdo timestamping API at ots.clockdo.com to request and retrieve OpenTimestamps proofs. No user login or account is required for basic usage. Rate limits and advanced features are managed server-side based on your site's plan.
Transparency and trust are core to Clockdo.
We collect minimal data necessary for timestamping. No content is stored permanently unless explicitly requested.
Fair usage, no abuse, and clear service expectations for all users.
Uninstalling the plugin removes all local data. Remote proof records are retained per our data retention policy.
A timestamp record is documentation — not an ownership claim or legal ruling. Use it as supporting evidence alongside other proof.