Confirmation
Each new block added on top of the block containing your transaction; more confirmations make reversal less likely.
When a transaction is included in a block, it has one confirmation. Each later block adds one more. On proof-of-work chains like Bitcoin, reversing a transaction would require redoing the work for every block on top of it, so more confirmations mean more certainty.
Why it matters for casino players
Casinos wait for a set number of confirmations before crediting a deposit. The number varies by casino and coin: for Bitcoin, one to three is common; chains with faster blocks may require more blocks but still take less time. Large deposits may need more.
Worked example
A casino requires 2 Bitcoin confirmations. Bitcoin averages a block about every 10 minutes, so your deposit usually credits around 20 minutes after you send it, though block times vary and a low fee can add a long wait.
If a deposit is slow
- Look up the transaction hash on a block explorer to see how many confirmations it has.
- If it has none, the fee may have been too low; some wallets let you raise it.
- Once it has the required number, contact support with the hash.