How to revert made fake coin exploit code's bug?

[wsxdrfv]

I heard some news about bitcoin previous version and its bug is in short, fake coin can be made?

Then all other bitcoin source cloned alt-coin also has that flaw in code?

So this is true and if someone exploit it and made much fake coin which is normally can't be got,

then what solution exist to revert this faked coin and deactivate it or remove it?

This is serious.

Thanks..

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[Rath_]

I heard some news about bitcoin previous version and its bug is in short, fake coin can be made?

Only some Bitcoin Core instances are vulnerable (0.14.0 to 0.16.2). If they receive a block with a transaction which has a duplicate input, they will crash. No new coin would have been created but it could pose a huge threat to the network. You can find more information here and here.

Then all other bitcoin source cloned alt-coin also has that flaw in code?

Yes, some Bitcoin clones are affected and their clients have to be patched by their developers manually. Bitcoin Cash and Litecoin are safe.

[wsxdrfv]

I heard some news about bitcoin previous version and its bug is in short, fake coin can be made?

Only some Bitcoin Core instances are vulnerable (0.14.0 to 0.16.2). If they receive a block with a transaction which has a duplicate input, they will crash. No new coin would have been created but it could pose a huge threat to the network. You can find more information here and here.

Then all other bitcoin source cloned alt-coin also has that flaw in code?

Yes, some Bitcoin clones are affected and their clients have to be patched by their developers manually. Bitcoin Cash and Litecoin are safe.

So litecoin forked coin is safe?

Then how some coin(litecoin cloned)'s someone has suddenly enormous coin(almost same with total supply of that coin) normally nobody can have it now?

And if this happened, what solution can be used to fix?

[achow101]

So litecoin forked coin is safe?

No. Litecoin, and every other coin that was forked from Bitcoin or pulled in new code from Bitcoin are vulnerable, unless they have also pulled in the fix.

And if this happened, what solution can be used to fix?

Pull in the changes from Bitcoin Core. Sync a new node with that software. Once it reaches the invalid block, it will reject it. From there, start mining a fork. Once that has more work than the original blockchain with the invalid block, that will become that coin's blockchain.

[wsxdrfv]

So litecoin forked coin is safe?

No. Litecoin, and every other coin that was forked from Bitcoin or pulled in new code from Bitcoin are vulnerable, unless they have also pulled in the fix.

And if this happened, what solution can be used to fix?

Pull in the changes from Bitcoin Core. Sync a new node with that software. Once it reaches the invalid block, it will reject it. From there, start mining a fork. Once that has more work than the original blockchain with the invalid block, that will become that coin's blockchain.

Hi, I sent you message.

[wsxdrfv]

And if this happened, what solution can be used to fix?

Pull in the changes from Bitcoin Core. Sync a new node with that software. Once it reaches the invalid block, it will reject it. From there, start mining a fork. Once that has more work than the original blockchain with the invalid block, that will become that coin's blockchain.
[/quote]
Thanks.

start mining a fork.
-> How to do this?

and then how deal already happened transactions after invalid block?

so this means coin split as different (like ethereum and ethereum classic?) and people should switch to new forked coin?
Then what happen people's existing balance? existing balance also become back to forked time?