Question 1

What is the difference between ECDSA and EdDSA?

Accepted Answer

ECDSA (Elliptic Curve Digital Signature Algorithm) is used by Bitcoin and Ethereum with the secp256k1 curve. EdDSA (Edwards-curve Digital Signature Algorithm) is used by Solana and other modern chains with the Ed25519 curve. EdDSA is generally faster, has simpler implementation, and provides stronger security guarantees against certain attacks.

Question 2

What is a public key in blockchain?

Accepted Answer

A public key is derived from your private key and serves as your identity on the blockchain. It can be shared freely and is used to verify that signatures were created by the corresponding private key. Blockchain addresses are typically derived from public keys through additional hashing steps.

Question 3

Can a digital signature be forged?

Accepted Answer

With current technology, forging a digital signature without the private key is computationally infeasible. The security of elliptic curve cryptography relies on the difficulty of the discrete logarithm problem. However, if a private key is compromised through phishing, malware, or poor storage practices, an attacker can produce valid signatures.

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