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51% attack

A 51% attack refers to a malicious actor (or group acting in concert), controlling over 50% of the total mining power of the blockchain network and disrupting the integrity of the blockchain.

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Trustless

This is a system of distributing trust among different actors in a system via an economic game that incentivizes participants in the system to cooperate with the rules defined by the protocol. The Bitcoin blockchain is an example.

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Transaction Pool

This is also known as a mempool, is a data structure that stores the set of unmined transactions that have been validated by miners.

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