Bedrock Differences

Quick Appendix

System transactions (L1 attributes deposited transaction)

User-deposited transactions (deposited transactions generated by the L2 chain derivation process)

The EVM

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Bedrock will produce new blocks every 2 seconds.

The following changes to the EVM are examined:

TIMESTAMP → returns the timestamp of the block (updates every 2 seconds).

BLOCKNUMBER → returns an actual block number (updates every 2 seconds)

The one-to-one mapping between blocks and transactions will no longer apply.

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Bedrock introduces the concept of system transactions. System transactions are created by the op-node , and are used to execute deposits and update the L2 view of L1.

Every block contains at least 1 system transaction called the L1 attributes deposited transaction.

Some blocks contain 1 or more user-deposited transactions.

All system transactions have an EIP-2718-compatible transaction type (0x7E).

All system transactions are unsigned, and set their v, r, and s fields to null.

EIP-1559

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As part of Bedrock, the network now supports EIP-1559.

Some differences between EIP-1559 in Optimism:

ETH is not burned (ETH on L2 would only lock it in the bridge forever).

EIP-1559 parameters have different values (values to be set are not finalised yet).