Cryptocurrency
What is Confirmation?
A confirmation is a block added to the chain after the block containing a transaction, each making reversal exponentially harder. Merchants require more confirmations on chains where reorganisations are cheap. The requirement is shown on the invoice before payment.
Why Confirmation matters
Merchants require more confirmations on chains where reorganisations are cheap. The requirement is shown on the invoice before payment.
Confirmation in practice
When you accept a crypto payment, watch the mempool and the chain depth after the block lands. A single confirmation means the transaction sits one block deep; each further block makes a reorg that reverses it materially more expensive. For high-value sales, wait for six or more blocks. Check the invoice's displayed requirement before releasing goods, not after. Getting it wrong — releasing on zero or one confirmation — exposes you to a chain reorg wiping the payment while you have already shipped. The cost is the full sale price plus the chargeback you cannot recover.
What people get wrong about Confirmation
People assume confirmations guarantee finality. They do not; they make reversal progressively harder, not impossible. A confirmation only means the network has built one block on top of yours. A determined miner or a favourable reorg can still remove it. The correction: treat confirmations as a probabilistic shield, not a proof, and set the threshold according to the value at risk.
Confirmation — common questions
How many confirmations should I wait for?
It depends on the payment value and the chain's reorg cost. Merchants typically require one for small retail items and three to six for larger transactions. The invoice shows the required number before payment, so check it there. For very large amounts, more is safer.
Can a confirmed transaction be reversed?
Yes, in theory. A confirmation means a block contains your transaction, but a chain reorganisation can replace it if an alternative chain gains more work. The deeper the confirmation, the more costly that becomes. For practical purposes, six confirmations make reversal economically unfeasible on major chains.
Where Confirmation comes up
- Paying for hosting with crypto vs a credit card A card payment creates a permanent, identity-linked record at your bank, the card network and the merchant, and can be reversed for up to 120 days. A crypt…
- Which cryptocurrency is best for paying for hosting? Monero for privacy — it hides sender, receiver and amount at the protocol level. USDT on TRON for cost and price stability, since the fee is cents and a do…
- How long does a crypto payment take to confirm? It varies by chain: Solana and TON confirm in under a minute, TRON in about a minute, Litecoin in around ten minutes, Bitcoin in roughly twenty and Monero …
- Monero vs Bitcoin for paying for hosting Bitcoin's ledger is public: anyone can see that an address paid a hosting invoice, and chain analysis can often connect that address to an exchange account…
More from cryptocurrency
- Monero
- Monero is a cryptocurrency that hides sender, receiver and amount at the protocol level using ring signatures, stealth addresses and RingCT.
- Ring signature
- A ring signature proves that one member of a group signed a message without revealing which one.
- Stealth address
- A stealth address is a one-time destination address generated for each payment so that transactions to the same recipient cannot be linked.
- RingCT
- RingCT conceals transaction amounts on the Monero blockchain while still allowing the network to verify that inputs equal outputs.
- Stablecoin
- A stablecoin is a token pegged to a fiat currency, typically the US dollar, and backed by reserves held by an issuer.
- TRC-20
- TRC-20 is the token standard on the TRON blockchain, most commonly used for USDT.
- Atomic swap
- An atomic swap exchanges two cryptocurrencies directly between wallets, with cryptography guaranteeing that either both sides complete or neither does.