Hey,

I am searching for a way to create a double spend for an existing transaction.
As example let us use this transaction: https://blockchain.info/tx/a22691fce395dc797492944dd0d2dfa454e6d73e3774774648ec30345651b2c2?show_adv=true

For our example the transaction has 0 confirmations at the moment we will do the double spend.
Now we need to raise the fees of the transaction right?

Is there a way to create a double spend with an existing transaction?
Maybe with using https://coinb.in/#newTransaction

And if yes, how to do it?