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Some casinos and stores are using 1 confirmation before releasing the product — meaning once your bitcoin transaction gets 1 confirmation, you receive the product.
This is wrong from them, because transactions with 1 confirmation can still be canceled using RBF (Replace-By-Fee), if they meet these 3 criteria:
1. Your BTC address starts with 1RBF prefix
2. The transaction is sent using a wallet or node you control (open source, full access, RBF enabled)
3. The transaction is marked as RBF replaceable
All these criteria are easily met if you use any open-source wallet or node setup.
The easiest way is to just generate a “1RBF” address using this tool:
https://zhangtechnologies.github.io/vanity-btc
In Desired Prefix, type RBF and wait until it finds an address. Remember, it’s case-sensitive, so you must type exactly RBF, not rbf or Rbf.
Sometimes, it can even take hours - so please be patient.
![[Image: Screenshot-122.png]](https://i.ibb.co/nNzKxFTF/Screenshot-122.png)
Then just click register - it creates a wallet for that address automatically. You can use that wallet to send BTC and later doublespend it.
![[Image: Screenshot-123.png]](https://i.ibb.co/rfZXzh9h/Screenshot-123.png)
How to Do It (Step-by-Step):
1. Generate your 1RBF address using the vanity tool above
2. Register and save the private key / wallet it gives you (if you lose the private key, you will lose access to your wallet)
3. In the wallet, go to Send, and send BTC to a vulnerable platform.
Wait until the tx shows (⅙ Confirmations) — that’s when the site usually credits you.
Click the 3 dots next to your transaction, then click “Doublespend”, raise the fee, and confirm.
![[Image: Screenshot-125.png]](https://i.ibb.co/7tm8GjPD/Screenshot-125.png)
That’s it - the transaction gets dropped, BTC comes back to your wallet, and the site already gave you what you paid for.
![[Image: Screenshot-126.png]](https://i.ibb.co/CfLFXR3/Screenshot-126.png)
![[Image: Screenshot-124.png]](https://i.ibb.co/rGBMhbJN/Screenshot-124.png)
You can even check the blockchain - there is absolutely no trace of any transaction to my 1xBit address: https://www.blockchain.com/explorer/addr…0fumnv008p
If you find more working casinos / stores that release the product after 1 confirmation me know in comments.