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On every prediction market today your position is public — size, timing, entry, and profit or loss. Anyone consistently good gets copied, and their edge is gone before they have realised it. Atrum hides the amount. Bets are encrypted on-chain and summed without ever being decrypted, so the market shows live odds while individual stakes stay private. Winnings are claimed through a zero-knowledge proof, so a payout cannot be traced back to the bet that earned it.
Everyone still sees that a bet was placed and which side it backed. Nobody sees how much, or whose. That line is exact, and Privacy model draws it precisely. If you are about to describe Atrum to someone, read that page first.

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Why this cannot be retrofitted

Homomorphic encryption lets a contract add ciphertexts. It does not let it compare them — and order matching is comparison. So an encrypted order book is not a hard engineering problem, it is a mathematical impossibility with today’s cryptography. Atrum is parimutuel because that is the only mechanism that works when the contract can add but cannot see. See Why parimutuel.

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What you can do

Place a private bet

Deposit, bet, and have the amount stay hidden the whole way through.

Understand the privacy

Exactly what is hidden, what is not, and what the limits are today.

Read the architecture

Encrypted accumulator, commitment tree, sequencer, publisher.

Market lifecycle

A market from creation through resolution to payout.

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Status

Live on Monad testnet. The full private path works end to end: deposit → encrypted bet → settlement → private redemption → withdrawal.
Currently running on testnet while the mainnet launch is prepared.