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Nonce

An abbreviation for, Number Only Used Once”, refers to a randomly generated number during mining that is encrypted in the blockchain. It is generated as part of an authentication mechanism to prevent replay attacks on previous

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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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