CCTP

CCTP Block Confirmations

Block confirmation requirements for attestations by chain

Before signing an attestation for a source chain event, Circle waits for a specified number of onchain block confirmations to achieve hard finality.

The tables below show the average time required for an attestation to become available after fast and standard messages are emitted onchain, respectively.

Source ChainNumber of BlocksAverage Time
Ethereum2~20 seconds
Arbitrum1~8 seconds
Base1~8 seconds
Codex1~8 seconds
Linea1~8 seconds
OP Mainnet1~8 seconds
Solana2-3*~8 seconds
Unichain1~8 seconds
World Chain1~8 seconds
Source ChainNumber of BlocksAverage Time
Ethereum~65*~13 to 19 minutes*
Arbitrum~65 ETH blocks*~13 to 19 minutes*
Avalanche1~8 seconds
Base~65 ETH blocks*~13 to 19 minutes*
Codex~65 ETH blocks*~13 to 19 minutes*
Linea1~6 to 32 hours**
OP Mainnet~65 ETH blocks*~13 to 19 minutes*
Polygon PoS~2-3~8 seconds
Sei1~5 seconds
Solana32~25 seconds
Sonic1~8 seconds
Unichain~65 ETH blocks*~13 to 19 minutes*
World Chain~65 ETH blocks*~13 to 19 minutes*
BNB Smart Chain3~2 seconds
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