✅ You Can Now Sign Like a Pro
Master digital signatures, ECDSA, and cryptographic authentication
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0 / 5 completed🎯 Key Takeaways
You have learned how digital signatures authenticate blockchain transactions, the algorithms powering them, and real-world applications securing trillions in value.
Public-Key Cryptography
Private key creates signatures (secret). Public key verifies signatures (shareable). One-way math prevents reverse-engineering.
4-Step Process
Hash message → Sign with private key → Broadcast signature → Verify with public key. Takes milliseconds to verify.
ECDSA: Blockchain Standard
Bitcoin and Ethereum use ECDSA with 256-bit keys. Compact, fast, battle-tested since 1985. Vulnerable if nonce reused.
EdDSA: Next Generation
Deterministic (no nonce risk), 20-30% faster than ECDSA. Used by Solana, Cardano, Monero. Modern alternative.
$1T+ Secured Daily
Every Bitcoin, Ethereum, DeFi, NFT transaction signed. 300K Bitcoin + 1.2M Ethereum transactions/day. Zero forgeries.
Identity & Multisig
Signatures enable passwordless authentication (Sign-in with Ethereum) and threshold security (Gnosis Safe $50B+ TVL).
🎓 Test Your Knowledge
Ready to test what you have learned? Take this 5-question quiz to verify your understanding of digital signatures.