Seal your work. Prove it forever.
Put a permanent, tamper-proof seal on any paper, idea, creative work, or file. Thappa hashes it, pins it to IPFS, and mints an immutable on-chain record — proof of what you made, and when.
- Content hash
- 0x9f2c4e7a…0a7f24
- IPFS CID
- bafybeigdy…...e4q
- Polygon tx
- 0x3ad1...7…..77c4
- Sealed at
- Jun 8, 2026, 02:02 PM
Four steps to permanent proof.
You keep your work private if you want to. All that has to go public is a hash — a fingerprint that proves the work without revealing it.
Hash
Your content is fingerprinted with keccak256 — a 32-byte hash unique to those exact bytes. The work itself never has to be public.
Pin to IPFS
The file (or its metadata) is pinned to IPFS for permanent, content-addressed storage. Its CID is part of the record.
Mint the seal
An on-chain seal is minted on Polygon: owner, hash, type, and block timestamp. Duplicate-proof — one hash can be sealed only once.
Get your proof
You receive a stamped certificate and a public link. Anyone can verify it forever; no one — not even us — can alter it.
If it has bytes, you can seal it.
Papers & research
Manuscripts, preprints, datasets, and findings — sealed before you submit or share.
Ideas & specs
Concepts, product specs, business plans — proof you had it first, without revealing it.
Creative work
Art, music, writing, designs — stamp authorship the moment you create.
Any file
Contracts, code, audio, video — anything with bytes can be sealed.
A seal you — and anyone — can trust.
Immutable
Once sealed, the record can never be edited or deleted. The contract is non-upgradeable.
Timestamped
The seal carries the block timestamp — cryptographic proof of when your work existed.
Duplicate-proof
A content hash can be sealed exactly once, so a seal is unambiguous ownership of that work.
Yours to verify
The seal is owned by your address and verifiable by anyone, with no account required.
Hold a seal? Anyone can check it.
Paste a seal number, a content hash, or drop the original file. Thappa reads the chain and tells you who sealed it, and exactly when — no account, no trust required.
Verify a seal- Content hash
- 0x7e3a1c8b…9a8451
- IPFS CID
- bafybeibq7…...t2c
- Polygon tx
- 0x55fa...9…..9d3b
- Sealed at
- Jun 6, 2026, 06:15 PM
Stamp your work before you share it.
It takes seconds, and the proof lasts forever.