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Open/Close

Open refers to a cryptocurrency’s price at the start of the day, while close is the cryptocurrency’s price at the end of the day.

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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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