July 30, 2026
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Glossary

51% Attack

51% Attack

A situation where a single entity controls more than 50% of a blockchain network's mining hash rate, allowing manipulation of transaction confirmations or double-spending.

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Optimistic Rollup

A Layer 2 scaling technology that assumes transactions are valid by default and only checks them if challenged.

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Oracle Problem

The fundamental challenge of bringing reliable off-chain data onto a blockchain without introducing trust assumptions.

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Seed Phrase

A sequence of 12 to 24 random words that serves as a master backup for a cryptocurrency wallet.

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