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Hash Race Challenge
🎭 Prove You Know Without Revealing Anything
Discover the cryptographic magic powering privacy coins and ZK-rollups
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0 / 5 completed🔐 Zero-Knowledge Proofs
How do you prove you know something without revealing what you know? Zero-knowledge proofs solve this paradox, enabling privacy-preserving verification on blockchains.
💡 The Privacy Problem
Traditional verification requires revealing your secret:
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Passwords
Server stores your password (breach = exposed)
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KYC Documents
Share full passport/ID to prove age
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Bank Balances
Reveal exact amount to prove solvency
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Public Blockchains
Every transaction visible forever
🎮 Interactive: Traditional vs Zero-Knowledge
See the difference between revealing secrets and proving knowledge
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Traditional Proof
Proving you know the password
Scenario: Prove you know the password
Alice needs to prove she knows her password to log in
Step 1: AliceProver
Types password: MySecret123!
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Step 2: ServerVerifier
Receives: MySecret123!
🎯 Three Properties of Zero-Knowledge Proofs
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1. Completeness
If statement is true, honest prover can convince honest verifier
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2. Soundness
If statement is false, no cheating prover can convince verifier (except with negligible probability)
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3. Zero-Knowledge
Verifier learns NOTHING except that statement is true (no information about the secret)
🚀 Why ZK Proofs Matter for Blockchain
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Private Transactions
Zcash: Prove transaction valid without revealing amount/sender/receiver
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Scalability
zkSync: Verify 1000s of transactions with single proof
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Identity
Prove you're over 18 without revealing birthdate
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Proof of Solvency
Exchange proves it has reserves without revealing holdings