Ask/Knowledge Atlas/51% attacks
Security · Modern Bitcoin

51% attacks

A miner or coalition with majority hashpower can potentially reorganize recent blocks or censor transactions, but cannot arbitrarily create bitcoin or spend coins without valid signatures.

Context

Why it matters

A miner or coalition with majority hashpower can potentially reorganize recent blocks or censor transactions, but cannot arbitrarily create bitcoin or spend coins without valid signatures.

Canonical knowledge

What California Bitcoin maintains

  • A miner or coalition with majority hashpower can potentially reorganize recent blocks or censor transactions, but cannot arbitrarily create bitcoin or spend coins without valid signatures.

Primary and technical sources

Evidence before assertion
Bitcoin Developer Documentation

Bitcoin.org

Tier — · technicalBitcoin: A Peer-to-Peer Electronic Cash System

Satoshi Nakamoto

Tier 1 · primary

Related concepts

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