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docs(consensus): clarify extension fallback semantics

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Nicholas Dudfield
2026-04-29 15:27:46 +07:00
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src/xrpld/app/consensus/ConsensusExtensionsDesign.md
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@@ -18,6 +18,15 @@ succeed. Works means missed or late extension material follows that feature's
deterministic fallback, such as zero entropy for RNG or normal Export
retry/expiry, rather than blocking core consensus.
## Fallback Semantics
RNG and Export use similar positive-path sidecar gates, but they do not have
the same safe fallback. RNG can safely close with deterministic zero entropy
when peers cannot establish quorum alignment on non-zero entropy in time.
Export has no equivalent dummy success value: without quorum-aligned verified
export signatures, the export must not be treated as complete and must retry or
expire under transaction rules.
## Core Invariants
1. Core consensus remains keyed by the transaction set.