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Transaction Fee

This is also called miners’ fees, users of a cryptocurrency who send out coins on the cryptocurrency blockchain/network pay small amounts of their coins to miners whose work is to verify the authenticity of transactions on the network and are paid according to the size of value being sent.

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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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Transaction Malleability

Transaction malleability is the process of altering a transaction's unique id by altering the digital signature that was used to generate it.

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