AZIP-14: Multiple Roots per Epoch in Outbox#33
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This AZIP modifies the L1 `Outbox` contract so that each epoch can accumulate multiple L2-to-L1 message roots rather than overwriting a single root every time a partial epoch proof is submitted. The nullifier bitmap that tracks consumed messages remains a single bitmap per epoch and is shared across all roots of that epoch. This eliminates a race condition in which a user's L1 exit transaction, built against a partial-proof root, reverts because a later proof for the same epoch has overwritten that root before the user's transaction is mined.
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This AZIP modifies the L1
Outboxcontract so that each epoch can accumulate multiple L2-to-L1 message roots rather than overwriting a single root every time a partial epoch proof is submitted. The nullifier bitmap that tracks consumed messages remains a single bitmap per epoch and is shared across all roots of that epoch. This eliminates a race condition in which a user's L1 exit transaction, built against a partial-proof root, reverts because a later proof for the same epoch has overwritten that root before the user's transaction is mined.