Do You Need Nonce?
The Purpose of a Nonce Is to Make Each Request Unique So That an Attacker Can't Replay a Request in a Different Context. It Doesn't Matter If the Attacker Gets...
The purpose of a nonce is to make each request unique so that an attacker can't replay a request in a different context. It doesn't matter if the attacker gets the nonce: in fact the point is that because the data includes a nonce, it won't be useful to the attacker.
Why do I need nonce?
The nonce is used to give 'originality' to a given message so that if the company receives any other orders from the same person with the same nonce, it will discard those as invalid orders. A nonce may be used to ensure security for a stream cipher.
What happens if there is no nonce in blockchain?
If not provided then the nonce will be read from account's state on the blockchain (it is part of the blockchain state). However, it can sometimes be useful to specify it explicitly. It might be useful, for example, if you need to re-send a transaction with a higher gas price if the first one is not being mined.
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