Works without an account

Verify any stamp.

Check if any file or text was sealed on MegaETH. Runs entirely in your browser — we never see your data, and it works even if TruthStamp goes away.

Paste the exact text you want to verify

Hashing happens locally in your browser. The text never leaves your device.

⚠️ Must be character-perfect. The text is hashed exactly as you stamped it — including all spaces, line breaks, and punctuation. If you stamped text longer than 280 characters, paste the full original text here.

Drop a file or click to upload

PDF, image, video, audio, or text — up to 100 MB

Your file is hashed locally in your browser. It is never uploaded or stored.

How file verification works

Drop any file here and TruthStamp computes its SHA-256 fingerprint entirely in your browser — the file never leaves your device. That fingerprint is then looked up directly on the MegaETH blockchain.

Practical use: If someone claims they stamped a document before a certain date, drag their file here. If the stamp exists, you'll see exactly when it was recorded on-chain — without needing the proof ID or hash. Perfect for third-party verification of contracts, research, or creative work.

Proof ID

Content hash (SHA-256)

💡 Find the hash on any proof page under Technical Details → Content hash. It starts with 0x and is 66 characters long. Only stamps made on the current contract can be looked up by hash directly on-chain.

Verify Bitcoin Archive (TSA-1)

Paste a Bitcoin txid or a TruthStamp Proof ID to decode and verify the on-chain TSA-1 archive record. Works independently — no TruthStamp servers required.

Bitcoin txid or Proof ID

₿ How Bitcoin archive verification works

TruthStamp embeds a TSA-1 canonical manifest into Bitcoin transactions via OP_RETURN. This page fetches the transaction from mempool.space, decodes the OP_RETURN data, and reconstructs the proof record — entirely in your browser. No TruthStamp servers involved. Works forever.

Verify without us, anytime, forever

Every TruthStamp proof can be verified without TruthStamp existing. Even if our website disappears tomorrow, your proof is still valid. Here's how anyone can verify it directly on MegaETH:

Calculate the SHA-256 hash of your file or text. On Mac/Linux: shasum -a 256 yourfile.pdf. For text and files online: emn178.github.io SHA-256 tool.
Prefix the hash with 0x if not already present. This is your content fingerprint.
Call verifyByHash(bytes32) on the TruthStamp contract using any Ethereum tool, MegaETH explorer, or the RPC: https://carrot.megaeth.com/rpc.
Contract address: loading...
The contract returns (proofId, timestamp, creatorIdentity). A non-zero proofId proves the content existed at that moment — immutably, forever.

Read our full permanence promise →