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In Ethereum, every transaction has a nonce. The nonce is the number of transactions sent from a given address.
Each time you send a transaction, the nonce increases by 1
. There are rules about what transactions are valid, and the nonce is used to enforce some of these rules. Specifically:
1
mined before one with a nonce of 0
.2
mined if you have not already sent transactions with a nonce of 1
and 0
.This field prevents double-spends, as the nonce is the order in which transactions are sorted. In order for a double-spend to be successful, you typically ...
This is why exchanges wait for you to have a certain number of confirmations before allowing you to trade freshly-deposited funds.
This method of double-spending is not possible on the Ethereum blockchain because each transaction has a nonce included with it. Even if you attempt to do the above, it will not work because the second transaction (nonce of 3
) cannot be mined before the first transaction (nonce of 2
).
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