About double-spend ???

[OddEvenBets.com]

I need advice.

Is possible creat double-spend attack use BitcoinCash (BCH) ?
I know that double-spend BTC is possible.

If you know how can do it, please PM.

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[achow101]

Bitcoin Cash is basically identical to Bitcoin except in three aspects: the signature hashing algorithm (which is actually partially the same as Bitcoin's as it is used for segwit), the difficulty adjustment algorithm, and the maximum block size. Because of this, they are vulnerable to largely the same attacks, including double spends of unconfirmed transactions.

[pooya87]

unconfirmed transactions are never safe and have never been safe and will never be safe. it has nothing to do with bitcoin or bitcoin cash. bitcoin has an additional feature called RBF which is easy to detect and what it does is that it makes it easy for people to bump their fees.

you don't need a PM explaining how to do it! just use google and you will find the answer on bitcoin wiki: https://en.bitcoin.it/wiki/Irreversible_Transactions#Attack_vectors

also a master thesis on bitcoin security which you may also find interesting: https://bitcointalk.org/index.php?topic=88149.0

[DannyHamilton]

If you know how can do it, please PM.

PM is not necessary.  Answer is simple.

If the original transaction is confirmed, then it is too late.  Double-spend is not possible for confirmed transactions in Bitcoin OR Bitcoin Cash

If the transaction is NOT confirmed, then you can create a new transaction that spends at least one of the same inputs. Then, you need to hope that the new transaction confirms before the original transaction.  You may be able to pay a miner or mining pool to give your second transaction preferential treatment.