Implement confidential payment settlement using Pedersen commitments - #565
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Kingsman-99 merged 1 commit intoJul 30, 2026
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Payers can now hide payment amounts on-chain with a real elliptic-curve
Pedersen commitment C = value*G + blinding*H over BLS12-381 G1:
- initialize() derives two independent, nothing-up-my-sleeve generators
G and H via hash-to-curve and pins them in instance storage.
- pay() gains an optional `commitment: Option<BytesN<32>>` -- when set,
the contract stores a digest of the commitment instead of moving any
funds or touching the invoice total, so nothing is revealed at pay time.
- reveal_confidential_payment(invoice_id, payer, value, blinding) recomputes
the commitment from the opening and checks it against the stored digest;
on success it pulls the real amount from the payer and credits the
invoice (only now does the amount become visible on-chain). Named
differently from the existing hash-based reveal_payment to avoid
colliding with that unrelated, previously shipped feature.
- Emits ConfidentialPaymentRevealed { payer, event_seq } with no amount.
- Tampered value/blinding and double-reveal all rejected; tests cover
commit->reveal, both tamper cases, double-reveal, and double-commit.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LZRyq9VXnCuCqKLUW4QLdj
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Payers can now hide payment amounts on-chain with a real elliptic-curve Pedersen commitment C = valueG + blindingH over BLS12-381 G1:
commitment: Option<BytesN<32>>-- when set, the contract stores a digest of the commitment instead of moving any funds or touching the invoice total, so nothing is revealed at pay time.Closes Implement confidential payment settlement using Pedersen commitments #352