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Reject empty merkle proof cache in on-chain generateProof

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An empty cache passes the existing mod-32 length check and silently
produces a witness with no path elements, yielding a proof no validator
will accept. Catch the case explicitly so the failure surfaces at the
callsite rather than after a wasted publish round-trip.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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stubbsta 2026-07-09 14:05:10 +02:00
parent 95d0a8bdd8
commit 1b149fed08
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logos_delivery/waku/rln/group_manager/on_chain/group_manager.nim
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@ -492,6 +492,9 @@ method generateProof*(
debug "Generating RLN proof"
?(await g.ensureFreshMerkleProofPath())
if g.merkleProofCache.len == 0:
return err("merkle proof cache is empty")
if (g.merkleProofCache.len mod 32) != 0:
return err("Invalid merkle proof cache length")