Sepolia · Sentinel A · release 1

104-bit secp256k1-shaped

Find the secret scalar d with d·G = Q. Exactly what recovering a private key from its public key means.

Open
Prize
250 tUSD
Estimated cost
$1,792 on CPU2⁵⁰·⁵ work, estimated, not benchmarked
Opened
Oct 19, 2026 · 2 h ago
Expires
Oct 19, 2027
Commitments
0

The instance

Derived from the hash of block 11,947,420. Anyone can recompute every value below from the spec and the chain.

Level id
0x8345a7d7fa3bbb9d904cb090a20737497d786e9c2f3453eb1a9851840d3bb03b
Seed
0xbeb220cba5d7bf50b2a844fb3a936160d028b8ac9299575d947a0bdcabcad8f6
Curve
y² = x³ + 7
p
10141204801825835211973625652367
n (order of G)
10141204801825831306544996472667
G
(3174745440716839501825524995788, 2059579704178405049885697175746)
Q
(5778436725775944558596024922760, 5990468180521231405590645642732)
Contract
0x5D6322…C48277

Solve

Find d. Small levels can be solved right here; big ones need a GPU. How solving works

Solve in your browser

Too big for a browser.

This curve's numbers are wider than 64 bits, beyond the in-browser solver. The cost model puts it at 2⁵⁰·⁵ steps even with every known shortcut. Levels this size need a GPU solver of your own. The instance above and the spec are everything it needs.

How big levels are solved

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 Sepolia.

  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.