The proposal EIP 648 introduced a new transaction type that allows transactions in the EVM to be processed in parallel. Transactions contain a list of address prefixes that represent the range of all addresses with that prefix, and any access to addresses outside this range will fail. This proposal incentivizes easy parallelization of transactions and is maximally backwards compatible with old-style transactions.

The proposal EIP 2930 adds a transaction type which contains an access list, a list of addresses and storage keys that the transaction plans to access. Accesses outside the list are possible but become more expensive.

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