With puzzle hunts that offer a prize, you usually have no way to check that the answer stayed the same throughout, or that the prize is real. If you're going to spend weeks on a cipher, that matters.
ProofOfSolve is built around fixing that. Each puzzle hides the seed words to a funded Bitcoin wallet, and the fastest correct solver wins the prize. A SHA-256 fingerprint of the answer is published before anyone plays. The answer is revealed after the win, so anyone can hash it and confirm it never changed. The prize wallet address is published at launch, so you can check it yourself on a public explorer such as mempool.space.
The puzzles use chained layers, ciphers invented for each puzzle rather than standard ones, and real-world clues found on Google Street View. You can use any tool you like, including AI chatbots. You don't need to know anything about crypto to play.
Some details on how it works:
Entries are timestamped to the millisecond, and the first correct entry wins. Each player gets a limited number of guesses per day.
Smaller puzzles are free to play and have smaller BTC prizes. Bigger puzzles are paid. Prize amounts will be announced at launch.
The winner restores the wallet in Electrum using a passphrase sent by ProofOfSolve, then moves the prize to their own wallet.
Players must be 18 or over, and paid puzzles aren't open in some US states.
There's also a free seed word lookup that runs in your browser. It checks words against BIP39 in 10 languages, SLIP39, old Electrum and Monero.
No puzzles are live yet. The first ones open soon, and there's an email signup if you want to be notified: https://Proofofsolve.com
A question for people here who make or solve ciphers: is publishing the answer's hash in advance enough to make a contest like this trustworthy to you? Or is there something else you'd want to see before putting real time into one?
Disclosure: I'm posting this on behalf of the Proofofsolve.com team.