Lock a prize behind a puzzle answer, or unlock one you've solved. Everything runs in your browser using the Web Crypto API — nothing is uploaded, nothing is stored. For maximum safety when sealing a real seed phrase, turn off Wi-Fi first — this page needs no network.
⚠ Never seal a wallet you use for anything else. Create a fresh throwaway wallet just for the prize, fund it, seal it, and delete every plaintext copy of the seed afterward. Once minted, a scroll is permanent and public — only the encryption stands between the world and the words.
Solved the puzzle? Paste the sealed block from the scroll and your answer. Decrypt on a device you trust, then move the funds to your own wallet fast — you're racing anyone else who also solved it.