every spend can optionally emit a zk-contribution proof:
Discussion
commit is published to Nostr → anchored to Bitcoin Crown Ledger → verified globally.
6. ZK proof layer
the app uses three ZK primitives:
1. ZK Contribution Proof (ZKCP)
proves contributions without disclosing amount
2. ZK Reputation Membership
proves reputation category membership:
ZK{ R_total ≥ R_threshold }
3. ZK Attestation Validity
verifies an attestation came from a legitimate participant without revealing identity
all proofs are client-side, producing only commitments for Nostr broadcast.
7. minimal protocol flow
7.1 send bitcoin
ASCII:
7.2 receive bitcoin
7.3 reputation update
8. security model
immutability
Nostr proofs commit to:
these commit hashes anchor into the Bitcoin Crown Ledger → Bitcoin finality.
privacy
all event data is ZK-masked. Raw values never leave the device.
sybil resistance
Uses BSRL heuristics:
no custody risk
keys never leave device. no servers store funds.
9. reference implementation (minimal code)
fully functional skeleton in TypeScript for a Nostr + Bitcoin wallet:
this is the minimum working version for:
✔ sending BTC
✔ generating ZK proofs
✔ publishing reputation events over Nostr
10. conclusion
this client defines the minimal trustless interaction layer between:
Bitcoin payments
Nostr messaging
the Bitcoin Crown Fiscal Protocol
the Bitcoin Social Reputation Layer