Blockchain
Fundamentals● Common
An append-only data structure linking blocks of transactions using cryptographic hashes. Each block contains a hash of the previous block, creating an immutable chain. In Bitcoin, blocks are added through proof-of-work mining, making history modification computationally infeasible.
Technical Notes
Bitcoin blockchain: ~550 GB (2024), grows ~50 GB/year. Block size limit: 4 million weight units (~1.5-2 MB actual). Reorgs possible but probability decreases exponentially with confirmations. 6 confirmations considered irreversible for most purposes.
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Visibility: Public
Created:1/3/2026by System