HASHBELL
Up next

…

The next card anyone mines. Whoever solves the puzzle first owns it, with ETH inside. You see its tier once it is yours, and its pattern is stamped from the winning hash.

Jackpot — won by the next golden card

How to play

Your computer races other players to find a lucky number. Find it first and you mint the next card: an NFT with real ETH inside and a shot at the jackpot.

  1. 0x7f3a91c0… ✗ 0xd44be290… ✗ 0x2c0e57b4… ✗ 00003a9f1e… ✓ lucky number: the card is yours

    Start mining

    Press Start and your computer begins guessing numbers, millions per second. It costs nothing but a little electricity.

  2. You pay 0.01 ETH

    Win the race

    Everyone guesses at the same time. The first to find a lucky number gets the next card and pays its price. 60% of that price goes straight into the card as ETH, and it stays yours.

  3. No. 1238?drawing…
    →
    No. 1238Golden+ jackpot
    win the draw: the whole jackpot goes in

    Jackpot draw

    Every card you mint is also a jackpot ticket. A moment after you mint, it is drawn. Win, and your card turns golden with the whole jackpot inside.

  4. →
    5 in 10.0285 ETH+10% luck
    5 cards × 0.006 ETH, minus 5%

    Merge for luck

    Combine cards into one bigger card. It keeps all their ETH, minus a 5% fee, and gives the cards you mine next a better jackpot chance: up to +25%.

  5. Rare0.006 ETHinside
    +0.006 ETH
    burn it: all the ETH inside comes back to you

    Cash out

    Burn a card and all the ETH inside goes to your wallet: its share of the price plus any jackpot it won. The card is gone for good, so keep it if you would rather collect or trade it.

The deck

Every design belongs to one of five tiers, and no two cards share a design. Mine one to find out which tier you get.

Jackpot

—

    Eight epochs

    The 4,000 cards come in 8 epochs of 500. In each new epoch the price goes up, cards take longer to find and the jackpot chance gets smaller, so the pots get bigger.

    Just mined

    The latest cards. Gold ones won the jackpot.

      The Forge

      Merge your cards into one heavier card. It keeps their ETH and gives the cards you mine next a better jackpot chance. Or burn a card to get the ETH inside.

      Your jackpot bonus+0%
      1. +10%5 cards merged
      2. +15%10 cards merged
      3. +20%15 cards merged
      4. +25%20 cards merged

      Only cards inside merged cards count. Tick cards below and merge them.

      Connect a wallet to see your cards.

      Where the price goes

      Every paid mint splits the same way. The split is fixed in the contract and nobody can change it.

      ETH in the cardHeld by the contract until you burn the card. Merging adds the ETH of every card together, less a 5% fee.

      JackpotGrows with every mint. A golden card takes all of it. If no card wins before the end, the last card gets the pot.

      Team & treasuryPaid to a fixed address, along with the merge fee. The contract has no owner, no pause and no upgrade.

      Common questions

      Is mining free?

      Trying costs nothing but electricity. The hashes are computed in your browser, not on-chain. You only pay when your rig finds a card: the card's price plus a small gas fee.

      Do I have to keep the tab open?

      Yes. Your browser does the mining, so the rig stops when the tab closes. Other miners keep going in the meantime, and your rig joins the current card when you return.

      What hardware do I need?

      Anything with a browser. The rig uses every core it can see. The difficulty follows the speed of all miners together, so a faster machine finds more cards — but every single hash has the same chance, so a slow machine can still get lucky.

      Someone found the card before me. Did I lose anything?

      No. Trying costs nothing, and your rig moves on to the next card by itself. The page checks the chain before it opens your wallet. If another mint still lands a moment before yours, your transaction fails and you lose only its small gas fee, never the card price.

      How does the jackpot work?

      Every paid mint adds 20% of its price to the jackpot. Right after a card is minted, it gets a draw. If it wins, it becomes a golden card and the whole jackpot goes inside it. Then the pot starts again from zero.

      The chance starts at 1 in 32 in epoch 1 and drops to 1 in 1,024 in epoch 8. It doubles after every 100 cards without a winner, and goes back to normal after a win. Holding merged cards gives the cards you mine next up to 25% more chance.

      The draw uses the hash of the next Robinhood Chain block, which does not exist yet when you send your mint. So nobody can know or pick the result. It takes about a fifth of a second, and the page shows it right away.

      What are tiers?

      Every card has one of five tiers: Genesis (1 card), Legendary (40), Epic (200), Rare (760) and Common (2,999). No two cards share a design. You find out which tier you got when your card is minted.

      What happens when I burn a card?

      The card is destroyed and all the ETH inside it goes to your wallet: its share of the price, plus the jackpot if it won one. A merged card pays out everything its cards held, minus the 5% merge fee. Whoever holds the card can burn it, any time.

      Can I sell or transfer my cards?

      Yes. Cards are standard NFTs (ERC-721), so they can be sold or sent anywhere. The ETH stays inside the card no matter who holds it — burning the card is what takes it out.

      What happens when the last card is mined?

      Card No. 4,000 ends the mining. It takes whatever is left in the jackpot, golden or not. Nobody mints after it, so anyone can press "Draw the jackpot" in the jackpot panel to settle its draw. The cards live on: hold them, trade them, merge them, or burn them for the ETH inside.