Quote from: Farul on April 30, 2019, 12:15:50 PM

Quote from: Nestade on April 29, 2019, 12:05:05 AM

Could you please elaborate what you mean by "double spend" in this context?

I Creating A Transaction That Including ETH, While There Are Other Transaction That Including The Same ETH On MemPool.

Example(This Is What I Mean In My First Reply):
1.I Sent 0.2 ETH To The Hacked Address
2.The Hacker Sent The 0.2 ETH To The Network(Waiting New Block)
3.I Immediately Sent A Transaction With Same Nonce Consisting Of Sending 0.2 ETH To My Non-Hacked Address.
4.The Hacker Know That I Want To Spend 0.2 ETH, So He Created New Same Transaction With Higher Gas
5.I Doing The [Step 3] Again But With Higher Gas
6.The Hacker Doing [Step 4] Again But With Higher Gas
7.The Loop Will End When New Block Was Found.

On The Ethereum Network If There's 2 Transaction Spending Same ETH(Same Nonce), The Miner Will Pick The One With Higher Gas Price (Not Transaction Fee)

INFO :
-Ethereum Average Block Speed Is Around 17 Second
-Hacker's Double-Spend Attempt Has A Delay Around 1-2 Seconds

If Your Transaction get Confirmed Before The Hacker Do The Double-Spend. The Transaction Is Success.
Sadly The Block Time Is "Random" Around 10-20 Second So You Need To Do Some Attempt(And Some Luck) Before It Works.

Double spending in ETH is meaningless as it takes sometime to realize that the transaction has been resent and by that time the transaction is already confirmed on the network. In BTC transactions, it takes 5-10 mins atleast to get a confirmation and hence double spending would make sense. In this case, OP sent ETH to a hacked address and has tokens in the hacked address so double spending too won't work here.