TL;DR
Optimism has launched Kona v1.8.0 elements with fixes for derivation, proof execution, TLS and preimage dealing with.
The discharge prevents a malformed batch from inflicting Kona to derive a special chain from op-node underneath a selected faulty-batcher situation.
Optimism recommends the discharge for all chains and says kona-host ought to be run with the matching kona-client v1.8.0 absolute prestates.
Optimism’s Rust-based fault-proof stack has acquired a considerable upkeep launch targeted on holding derivation and proof execution aligned with the remainder of the OP Stack.
Kona host v1.8.0 was printed October 1 alongside the matching shopper launch. Optimism recommends the replace for all chains.
The discharge is technical, however the issue it addresses is simple to know: two items of verification software program mustn’t derive completely different solutions from the identical chain information.
Malformed batches get stricter remedy
After the Holocene improve, Kona now checks the father or mother hash of every singular batch towards the protected head in the identical means op-node does.
Optimism says the earlier verify at all times handed. In a slender case the place a defective batcher produced a malformed batch, Kona may due to this fact derive a special chain from op-node.
The staff notes that fault proofs are unaffected except the batcher truly misbehaves. Nonetheless, matching derivation habits throughout purchasers is precisely the kind of consistency requirement fault-proof methods depend upon.
That fault-proof roadmap can be seen in Tremendous Root dispute-game governance and Superchain interoperability testing.
Execution errors are dealt with extra fastidiously
Kona v1.8.0 additionally modifications what occurs when proof execution runs into errors.
A block is now changed with a deposit-only block, or dropped in older situations, solely when the payload is definitely invalid. Errors comparable to lacking preimage or witness information now cease execution as an alternative of being handled as proof that the payload itself was dangerous.
That sounds refined, however fault proofs want to tell apart “I can’t full this computation” from “this computation proves the block is invalid.”
The discharge additionally updates the EVM implementation, patches a TLS dependency and improves preimage-server error dealing with.
The OP Stack is turning into extra client-diverse
Optimism’s infrastructure more and more consists of a number of implementations and proof methods fairly than one canonical piece of software program.
Shopper variety can enhance resilience, but it surely additionally creates a brand new requirement: impartial implementations need to agree exactly on state transitions and edge instances.
The identical upkeep burden is seen in Optimism’s required op-batcher releases and different operator updates.
Kona v1.8.0 is due to this fact much less a few flashy new characteristic and extra about ensuring the verification layer behaves predictably when the inputs are ugly. In fault-proof infrastructure, that’s precisely the place reliability issues most.
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This text was written by the Information Desk and edited by Samuel Rae.
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