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I am testing a smart contract that requires a nonce for every single method I invoke. My idea was to use the Metasmask transaction nonce of the connected account, but I do not know how to extract the nonce of the next transaction from javascript... is there a built-in api method I can call that returns it?

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A nonce is just a number of previous transactions you made with your account. Every new transaction requires nonce to prevent double-spending attacks. You can read more about it here.

There is a function in web3 API for retrieving nonce.

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