Academy Lesson attack-51-percent

Summary

Majority hash power attack enabling censorship and deep history rewrites.

Direction	Relation	Node
Outgoing	STRENGTHENS	Reorg
Outgoing	WEAKENS	Probabilistic Finality
Outgoing	EXPLOITS	Proof of Work
Outgoing	EXPLOITS	Difficulty Target
Outgoing	EXPLOITS	Reorg
Outgoing	DEPENDS_ON	Hashpower Majority Assumption
Outgoing	WEAKENS	Immutability
Outgoing	MITIGATED_BY	Decentralized Hash Distribution
Incoming	WEAKENS	Decentralized Hash Distribution

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What is Bitcoin?

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Hover the headers for quick tooltips, then read the short canonical distinction.

Bitcoin is pseudonymous: addresses are public identifiers without built-in real names, but flows can still be traced and clustered.

Nodes enforce consensus rules by validating blocks/transactions. Miners order transactions into blocks and compete in proof-of-work.

Wallets store and manage cryptographic keys used to sign spends. The bitcoin itself exists as UTXOs on the blockchain state.

Bitcoin base layer optimizes final settlement and security. Lightning optimizes speed and cost for day-to-day payment flow.