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docs: add kona build determinism invariant #889

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docs: add kona build determinism invariant
maurelian Feb 4, 2026
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25 changes: 21 additions & 4 deletions specs/protocol/l2-upgrades-1-execution.md
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Expand Up @@ -57,6 +57,8 @@
- [Impact](#impact-7)
- [iNUTB-005: Upgrade transactions do not revert](#inutb-005-upgrade-transactions-do-not-revert)
- [Impact](#impact-8)
- [iNUTB-006: Deterministic Kona Program Build](#inutb-006-deterministic-kona-program-build)
- [Impact](#impact-9)
- [Bundle Format](#bundle-format)
- [Bundle Generation Process](#bundle-generation-process)
- [Bundle Verification Process](#bundle-verification-process)
Expand All @@ -73,13 +75,13 @@
- [Mitigations](#mitigations-10)
- [Invariants](#invariants-2)
- [iUBGL-001: Sufficient Gas Availability](#iubgl-001-sufficient-gas-availability)
- [Impact](#impact-9)
- [iUBGL-002: Deterministic Gas Allocation](#iubgl-002-deterministic-gas-allocation)
- [Impact](#impact-10)
- [iUBGL-003: Gas Limit Independence from Block Gas Limit](#iubgl-003-gas-limit-independence-from-block-gas-limit)
- [iUBGL-002: Deterministic Gas Allocation](#iubgl-002-deterministic-gas-allocation)
- [Impact](#impact-11)
- [iUBGL-004: Gas Allocation Only for Upgrade Blocks](#iubgl-004-gas-allocation-only-for-upgrade-blocks)
- [iUBGL-003: Gas Limit Independence from Block Gas Limit](#iubgl-003-gas-limit-independence-from-block-gas-limit)
- [Impact](#impact-12)
- [iUBGL-004: Gas Allocation Only for Upgrade Blocks](#iubgl-004-gas-allocation-only-for-upgrade-blocks)
- [Impact](#impact-13)
- [Gas Allocation Specification](#gas-allocation-specification)

<!-- END doctoc generated TOC please keep comment here to allow auto update -->
Expand Down Expand Up @@ -407,6 +409,21 @@ The upgrade transactions must successfully execute without reverting.

Reverting would likely cause a chain halt.

#### iNUTB-006: Deterministic Kona Program Build

For a given commit, the build process MUST produce a byte-identical kona program artifact across all builds,
regardless of environment or timing. Any non-determinism in the build (e.g., unstable codegen, random iteration
order over NUC struct fields, unstable sorting, unused current timestamps) violates this invariant and breaks
prestate reproducibility.

##### Impact

**Severity: Critical**

Non-deterministic builds prevent verification that a given kona program corresponds to specific source code,
undermining prestate reproducibility and making it impossible to independently verify the correctness of fault
proofs. This could allow unverified or compromised program artifacts to be used in the system.
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### Bundle Format

The bundle is a JSON file with the following structure:
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