Block Confirmation
The number of blocks added after a transaction block, indicating settlement security.
The number of blocks added after a transaction block, indicating settlement security.
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Sep 2026 · Punteggio di freschezza: 50%
What is Block Confirmation?
The number of blocks added after a transaction block, indicating settlement security.
- Category
- concept
- Type
- Authority Node
- Sources
- 1
When a transaction is included in a block, it has one confirmation. Each subsequent block adds another. Each new block requires more accumulated proof-of-work to reverse, so the cost of rewriting history grows exponentially with confirmatio
Confirmations are the practical measure of settlement security. Accepting a zero-confirmation transaction carries reorg risk; waiting for more confirmations reduces it. Understanding thresholds helps users and businesses balance speed again
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1. What Is a Block Confirmation
A block confirmation is the number of blocks mined on top of a block containing a transaction. It measures how likely a transaction is to be final and irreversible.
2. How It Works
When a transaction is included in a block, it has one confirmation. Each subsequent block adds another. Each new block requires more accumulated proof-of-work to reverse, so the cost of rewriting history grows exponentially with confirmations. Exchanges and services set confirmation thresholds (e.g., 2-6 for Bitcoin, fewer for faster chains) before crediting deposits.
3. Why It Matters
Confirmations are the practical measure of settlement security. Accepting a zero-confirmation transaction carries reorg risk; waiting for more confirmations reduces it. Understanding thresholds helps users and businesses balance speed against finality — especially for large or cross-chain transfers.
4. Key Facts
- Bitcoin: 6 confirmations is the traditional "safe" threshold
- Reorgs can occur from mining races or chain forks
- Most PoS chains finalize in seconds-to-minutes without confirmations
- Confirmation depth directly correlates with reversal cost
5. Related Concepts
- bitcoin
- full-node
- reorg
- block-confirmation
Frequently Asked Questions
What is Block Confirmation?
The number of blocks added after a transaction block, indicating settlement security.
How does Block Confirmation work?
A block confirmation is the number of blocks mined on top of a block containing a transaction. It measures how likely a transaction is to be final and irreversible. When a transaction is included in a block, it has one confirmation. Each subsequent block adds another. Each new block requires more a
Why does Block Confirmation matter in Web3?
- full-node - reorg - block-confirmation