BNB testnet · Frontier

6 rounds reduced rounds

Find a preimage for round-reduced Keccak, the shape of the Crunchy Contest.

Open
Prize
Record level, no prize
Estimated cost
From published attacks
Opened
Oct 19, 2026 · 3 h ago
Expires
Oct 18, 2028
Commitments
0

The instance

Derived from the hash of block 137,680,539. Anyone can recompute every value below from the spec and the chain.

Level id
0xc6041b78681e63c0fff0cdb7f7190f0cb7324963df49e9912b47875dc400f9aa
Seed
0xcfc170724816fcfc624a626d2616f481d8665b7588972f8113c207d7d592e6e8
Function
Keccak[r=1440, c=160], 6 rounds, 80-bit output
Target bits t
80
Target T
0xe7c17434dd0f9b7af66a
Contract
0xceE960…faf856

Claim

Solved it? Check the answer here, then commit and reveal. The reference solver and the spec are in the method notes. How to solve

  1. 1

    Connect a wallet

    No browser wallet found. Any EIP-1193 wallet works, on BNB testnet.

  2. 2

    Check your solution

    Checked in your browser against the live instance. Nothing is sent until you commit.

  3. 3

    Commit

    Publishes a fingerprint of your solution bound to your payout address. Nobody can read the solution from it, and copying it would still pay you.

  4. 4

    Reveal, then get paid

    Reveal once your commitment is 3 blocks old. The earliest commitment with a valid reveal is paid after a …-minute settlement window.

Your salt is kept in this browser and in the receipt file. Without it a commitment cannot be revealed. Every claim from this browser is listed under My claims.

History

Every event for this level, from the contract.