The Unguessable Number. A little JavaScript, a lot of zeros,
and an unreasonable amount of optimism.
Your next randomly derived address will appear here.Nothing runs until you press start. Automatically pauses when you leave this tab.
A dedicated Bitcoin address created for this challenge. Every attempt derives an uncompressed public key and compares its address hash with this fixed target.
FUNDING NOT YET VERIFIEDA proposed $21 contribution is not a verified balance or guaranteed payout. The available prize is whatever unspent BTC is actually at the address, less transaction fees.
Key checks make no network requests. “View funding” opens a public explorer. Matching a key does not automatically transfer funds.
Approximate odds per random key of matching this 160-bit address hash, using one public-key encoding.
Chance of a match in this run: 0. Each new guess has the same odds.
Every check targets the dedicated sponsor Bitcoin address.
A background worker generates valid random private keys, derives secp256k1 public keys, and calculates SHA-256 then RIPEMD-160. It compares the result with the sponsor address. Only completed comparisons count. Keys and checks stay on your device; no automatic transfers.
Set a comfortable pace and start checking real Bitcoin keys. Pause whenever you like; completed checks stay saved in this browser.
Progress is saved on this browser only. No account required. No global leaderboard.