Quote from: BitCoinTa|k on August 02, 2018, 05:39:44 AM

Quote from: retprogramisto on August 01, 2018, 04:31:40 PM

Replace by fee (RBF) just means that the sender can resend the transaction with a higher fee, if they accidentally set a low fee and dont want to wait hours for confirmations. It is possible to double spend an unconfirmed transaction without RBF flag.

When the transaction has 1 confirmation it is safe from double spend attacks. Thats why it is important to wait ca 10 minutes for 1 confirmation before sending the product. For high amounts some people prefer to wait for 3+ confirmations.

If there is 1 confirmation does it mean you can't do RBF?

No, you can only use RBF for unconfirmed transactions. Otherwise your transaction was already put into a block and added to the chain.