Bridge tracks nonce-consumed mapping

Evidence summary #

Bridge tracks nonce-consumed mapping | YES. LayerZero v2 EndpointV2 implements gapless strictly monotonically increasing nonce per channel. Exactly-once delivery is enforced: "deleting the verified hash of a packet from the lossless channel after it is delivered and disallowing verification of nonces less than or equal to the lazy inbound nonce." | LayerZero v2 docs: `getInboundNonce()`, "exactly-once delivery enforcement"; LayerZero v2 deep dive: "each channel maintains a logical clock... ga...

Sources #

Methodology #

Determine whether the bridge inbox maintains a nonce-consumed mapping and rejects replay of used nonces.

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