Security • Estimated 45m

Hash Functions

fundamentals.hash-functions

Hash functions deterministically compress arbitrary inputs into fixed-size digests. Bitcoin relies on preimage, second-preimage, and collision resistance for identifiers, commitments, and proof-of-work.

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Curated resources (3)

• Mastering Bitcoin (book) Introduces hashes alongside Bitcoin keys, addresses, and transaction identifiers.
• Bitcoin Developer Guide: Block Chain (article) Shows where hashing appears in block headers, merkle roots, and proof-of-work.
• Bitcoin Core Academy: Script (article) Connects hashing to practical Bitcoin validation and script-era design choices.

Direct prerequisites (0)

• None

Direct dependents (5)

• BIP39 Mnemonics
• HTLCs
• Merkle Trees
• Proof of Work
• Schnorr Signatures

Canonical site description: Interactive Bitcoin knowledge graph with prerequisites, curated resources, and structured topic pages.