Note: These values are subject to change.
Before signing an attestation for a source chain event, Circle waits for a specified number of onchain block confirmations to achieve hard finality.
Select the applicable CCTP version below to view the required block confirmations and average time to attestation for each blockchain.
- CCTP V1
- CCTP V2
The table below shows the average time required for an attestation to become available after a message is emitted onchain.
CCTP V1 Attestation Times
| Source Chain | Number of Blocks | Average Time |
|---|---|---|
| Ethereum | ~65* | ~13 to 19 minutes* |
| Avalanche | 1 | ~8 seconds |
| OP Mainnet | ~65 ETH blocks* | ~13 to 19 minutes* |
| Arbitrum | ~65 ETH blocks* | ~13 to 19 minutes* |
| Noble | 1 | ~20 seconds |
| Base | ~65 ETH blocks* | ~13 to 19 minutes* |
| Polygon PoS | ~200* | ~8 minutes |
| Solana | 32 | ~25 seconds |
| Sui | 1 | ~8 seconds |
| Aptos | 1 | ~8 seconds |
| Unichain | ~65 ETH blocks* | ~13 to 19 minutes* |
Block confirmations for L2s to Ethereum
Arbitrum, Base, OP Mainnet, and Unichain are Layer 2 blockchains that publish transaction data in batches to Ethereum L1. The time required to post a batch varies but typically takes a few minutes. Once the batch is posted, Circle waits for the Ethereum L1 block containing the batch to finalize before attesting, a process that takes approximately 13-19 minutes.
The tables below show the average time required for an attestation to become available after fast and standard messages are emitted onchain, respectively.
Note: These values are subject to change.
CCTP V2 Fast Message Attestation Times
| Source Chain | Number of Blocks | Average Time |
|---|---|---|
| Ethereum | 2 | ~20 seconds |
| Arbitrum | 1 | ~8 seconds |
| Base | 1 | ~8 seconds |
| Linea | 1 | ~8 seconds |
CCTP V2 Standard Message Attestation Times
| Source Chain | Number of Blocks | Average Time |
|---|---|---|
| Ethereum | ~65* | ~13 to 19 minutes* |
| Avalanche | 1 | ~8 seconds |
| Arbitrum | ~65 ETH blocks* | ~13 to 19 minutes* |
| Base | ~65 ETH blocks* | ~13 to 19 minutes* |
| Linea | 1 | ~6 to 32 hours** |
| Sonic | 1 | ~8 seconds |
Block confirmations for L2s to Ethereum
Base is a Layer 2 blockchain that publishes transaction data in batches to Ethereum L1. The time required to post a batch varies but typically takes a few minutes. Once the batch is posted, Circle waits for the Ethereum L1 block containing the batch to finalize before attesting, a process that takes approximately 13-19 minutes.
Hard finality for Linea
The typical time before hard finality on Linea is 6-32 hours. This is expected to be reduced in a future Linea upgrade.
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