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I have a question about double spend attack on ethereum

I heard that double spend attack is prevented by Nonce

and we can send transactions with different nonce it can be validate

but this situation I thought always two transaction is mined by different blocks

I Want to know is possible to contain two transaction(with different none) for one block

and so if possible, how can be validated by miner? (their state is same state)

dongyoung le
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  • Thanks, i think that is problem from different account. That means if two transaction from one account, lower nonce transaction could be upper gas price right? – dongyoung le Mar 18 '19 at 06:00
  • This is not a duplicate. But yes, two transactions from the same account can be included in the same block. Transactions within a block are ordered, and in this case, the transaction with the lower nonce will have to be included first. Validation is simple: validate each transaction within the block, in order. – user19510 Mar 18 '19 at 06:04
  • @smarx Thanks for reply. So it doesn't matter with gas price. lower nonce is validated first.. it is simple. thanks – dongyoung le Mar 18 '19 at 08:34
  • Yes, nonces have to be strictly consecutive. If a certain address has made 3 transactions, the next transaction has to have the nonce 3. – user19510 Mar 18 '19 at 08:38
  • Another question.. So that ordering is supported by miner? is there any algorithm in geth code? – dongyoung le Mar 18 '19 at 08:52
  • Yes, and I guess yes? Not sure what you're asking. – user19510 Mar 18 '19 at 14:12
  • Sorry for my poor english, So when miner makes block, they make consequently transactions with ordered nonce .. And i got a answer for my question Thanks – dongyoung le Mar 19 '19 at 03:58

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