Solution: LP-0005 — Private Balance Attestation#89
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Add Success Criteria Checklist (honest [x]/[ ] against prize spec), FURPS Self-Assessment (5 subsections with real prose), and Terms & Conditions acknowledgment. Also rewrites Approach to document the env::verify() LEZ-native pattern and the off-chain verifier-lib.
…rt, gatekeeper, replay denial
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Solution: LP-0005 — Private Balance Attestation
Submitted by: retraca
Repo: https://github.com/retraca/lp-0005-balance-attestation
A zero-knowledge balance attestation protocol for LEZ. A user proves their account balance exceeds a threshold without revealing the actual balance, account ID, or nsk. Proof is one-shot: a circuit-bound nullifier prevents re-proving.
Two components: RISC0 circuit guest (Merkle membership + balance check + nullifier commit) and a SPEL on-chain gating program (verifies IMAGE_ID, enforces Merkle root freshness, rejects spent nullifiers, checks Ed25519 presenter binding).
Full write-up in
solutions/LP-0005.md.