Cryptography in Bitcoin

11 min readinteractiveIncludes quiz · 5 questions

Cryptography is the mathematical foundation that makes Bitcoin secure. Let's explore the key cryptographic concepts.

Hash Functions (SHA-256):

  • •Converts any input into a fixed 256-bit output
  • •One-way function (can't reverse)
  • •Deterministic (same input = same output)
  • •Avalanche effect (tiny change = completely different output)
  • •Used for mining and creating block chains
Cryptography Explained
Cryptography Explained

Digital Signatures (ECDSA):

  • •Proves ownership without revealing private key
  • •Creates unforgeable signatures
  • •Anyone can verify with public key
  • •Each transaction must be signed
  • •Ensures only the owner can spend Bitcoin

Merkle Trees:

  • •Efficiently summarize all transactions in a block
  • •Allow lightweight verification
  • •Enable SPV wallets
  • •Create a tamper-evident structure

Test Your Knowledge

This lesson includes a 5-question quiz (passing score: 80%).

Quiz functionality available in the mobile app.