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Air Gapping

Air gapping is a security mechanism employed to ensure that a computer is isolated from unsecured networks to prevent hacking attacks.

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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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Transaction Malleability Attack

It's a dubious exploit that allows an attacker to modify a bitcoin transaction's unique ID before it's confirmed on the network. If the attacker is able to successfully pull this off,  the alteration allows someone to pretend that a transaction never took place.

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