PostStamper

PostStamper - Blockchain Timestamps for Social Media Create verifiable proof of when you posted content online. PostStamper generates cryptographic timestamps anchored in the Bitcoin blockchain using the OpenTimestamps protocol. How It Works Click the stamp button on any supported post A SHA-256 hash is created locally in your browser The hash is submitted to OpenTimestamps calendar servers Within 2-3 hours, your timestamp is confirmed in a Bitcoin block Download the .ots proof file to verify anytime Privacy by Design Your content never leaves your browser. Only the cryptographic hash is sent to timestamp servers—your actual posts, messages, and conversations stay private. One-click timestamping from any supported page Separate stamp (your content) and witness (others' content) options Downloadable .ots proof files Automatic upgrade from pending to blockchain-confirmed Export all timestamps as ZIP Verify proofs against original content Keyboard shortcuts for quick access Built on Open Standards Uses OpenTimestamps, an open-source protocol. Proof files work with any compatible tool and can be independently verified at opentimestamps.org. No Account Required All data stored locally. No registration, no tracking, no data collection.