From a67f4c43f743900f7747338d6b3fcc576c68ae14 Mon Sep 17 00:00:00 2001 From: Markus Maiwald Date: Thu, 5 Feb 2026 00:30:23 +0100 Subject: [PATCH] feat(rfc-0315): Add Zig Verifier PoC for Access Tolls - TollClearanceProof structure with STARK support - Immediate and lazy (Kenya) verification modes - NonceCache for replay prevention - 6 passing unit tests Refs: RFC-0315 v0.3.0 --- specs/_ACTIVE/RFC-STATUS.md | 82 +++++ src/access-toll/README.md | 152 ++++++++ src/access-toll/build.zig | 50 +++ src/access-toll/toll_verifier.zig | 578 ++++++++++++++++++++++++++++++ 4 files changed, 862 insertions(+) create mode 100644 specs/_ACTIVE/RFC-STATUS.md create mode 100644 src/access-toll/README.md create mode 100644 src/access-toll/build.zig create mode 100644 src/access-toll/toll_verifier.zig diff --git a/specs/_ACTIVE/RFC-STATUS.md b/specs/_ACTIVE/RFC-STATUS.md new file mode 100644 index 0000000..545a862 --- /dev/null +++ b/specs/_ACTIVE/RFC-STATUS.md @@ -0,0 +1,82 @@ +# RFC STATUS UPDATE - 2026-02-04 + +## CONCEPTUALLY STABLE (Frozen Protocol Mechanics) + +### RFC-0648: Hamiltonian Economic Dynamics +- **Status:** PRE-IMPLEMENTATION / STABLE +- **Stability:** Protocol mechanics frozen +- **Tuning:** Parameter adjustment only via field testing (Ki, Kp, Kd, bands) +- **Changes:** No changes to mathematical framework allowed + +### RFC-0649: Emergent Protocol-Owned Emission (EPOE) +- **Status:** PRE-IMPLEMENTATION / STABLE +- **Stability:** Core mechanisms frozen + - Opportunity Windows (injection) + - Demurrage + Burn (extraction) + - Enshrined PID with Protocol Caps + - Anti-Sybil: Genesis + Maintenance +- **Tuning:** Bandwidths, multipliers, costs adjustable +- **Changes:** No structural changes allowed + +## DRAFT (Ready for Review) + +### RFC-0130: ZK-STARK Primitive Layer +- **Status:** DRAFT v0.1.0 +- **Scope:** Zero-knowledge proofs without trusted setup +- **Circuits:** Membership, Reputation, Trust Distance, Balance, Velocity, Delegation +- **Kenya Compliance:** Recursive compression (45-200 KB → 2-5 KB) +- **Integration:** W3C Verifiable Credentials +- **Next:** Review and freeze + +### RFC-0205: ChapterPassport Protocol +- **Status:** DRAFT v0.1.0 +- **Scope:** Universal credential for Identity + Economics + Governance +- **Layers:** Identity Core, Membership, Economic Standing, Attestations, ZK-Proofs +- **Integration:** RFC-0130 (ZK-STARK), RFC-0648 (Hamiltonian) +- **Next:** Review and freeze + +--- + +## PRIORITY 1: RFC-0315 (ACTIVE DEVELOPMENT) + +### RFC-0315: Privacy-Preserving Access Tolls +- **Status:** ACTIVE DRAFT v0.3.0 +- **Layer:** L2 (Economic Strategy) +- **Scope:** Dynamic resource allocation with ZK-STARK privacy +- **Dependencies:** + - ✅ RFC-0130 (ZK-STARK #10 TollClearanceCircuit) + - ✅ RFC-0205 (Passport nullifier lifecycle) + - ✅ RFC-0648 (Hamiltonian velocity scaling) +- **Key Features:** + - Gas-less toll verification via STARKs + - Kenya-compliant recursive compression (<5KB) + - Trust-scaled discounts via QVL + - Batch verification for router performance +- **Implementation:** + - ✅ Zig Verifier PoC complete (`features/access-toll/`) + - ✅ Core data structures (TollClearanceProof, Nullifier, LazyBatch) + - ✅ Replay prevention (NonceCache) + - ✅ Immediate & lazy verification modes + - ✅ 6 unit tests passing +- **Urgency:** CRITICAL - Blocks L1/L2 integration +- **Next:** Winterfell STARK integration, Hamiltonian coupling +- **Blocked By:** None - ready for extension + +--- + +## PROTOCOL FREEZE POLICY + +**Effective immediately:** +- ❌ NO changes to protocol mechanics on stable RFCs +- ❌ NO new economic primitives without RFC-0315 foundation +- ✅ Parameter tuning via field testing only +- ✅ Implementation bugs can be fixed +- ✅ RFC-0315 completion has priority + +**Reason:** L1 stability required before L2/L4 development + +--- + +**Signed:** Janus + Markus +**Date:** 2026-02-04 +**Epoch:** Pre-Implementation Lock diff --git a/src/access-toll/README.md b/src/access-toll/README.md new file mode 100644 index 0000000..9c7203f --- /dev/null +++ b/src/access-toll/README.md @@ -0,0 +1,152 @@ +# RFC-0315 Access Toll Protocol - Zig Verifier PoC + +**Status:** IMPLEMENTATION v0.1.0 +**Target:** Zig 0.13+ +**License:** EUPL-1.2 + +## Overview + +This is a Proof-of-Concept implementation of the **Privacy-Preserving Access Toll** verifier from RFC-0315. It demonstrates: + +- **ZK-STARK Toll Clearance Proofs** (structure only - production uses winterfell/starky) +- **Lazy Batch Verification** for Kenya compliance +- **Nullifier-based Replay Prevention** +- **Trust-Scaled Toll Bands** + +## Structure + +``` +access-toll/ +├── toll_verifier.zig # Main implementation +├── build.zig # Build configuration +└── README.md # This file +``` + +## Core Components + +### TollClearanceProof +ZK-STARK #10 proof structure containing: +- `stark_proof`: FRI-based STARK (placeholder in PoC) +- `compressed`: Recursive compression for Kenya mode (<5KB) +- `commitment_hash`: Opaque toll commitment (blake3) +- `nullifier`: Anti-replay nonce +- `toll_band`: Acceptable price range + +### TollVerifier +Main verification engine: +- **Immediate mode**: Full STARK verification (high-resource routers) +- **Lazy mode**: Optimistic acceptance with batch verification (Kenya mode) +- **Replay prevention**: Nullifier cache with GC + +### LazyBatch +Resource-constrained verification queue: +- Accumulates proofs for batch processing +- Time and size-based flush triggers +- Recursive STARK aggregation (placeholder in PoC) + +## Build & Run + +```bash +# Build library +zig build + +# Run demo +zig build run + +# Run tests +zig build test +``` + +## Demo Output + +``` +=== RFC-0315 Toll Verifier PoC === + +[1] Verifier initialized +[2] Commitment computed: a1b2c3d4... +[3] Immediate verification: valid + +[4] Kenya Mode (lazy batching): + Toll 1: valid (queued) + Toll 2: valid (queued) + ... +[5] Batch processed + +[Stats] Verified: 11, Rejected: 0 +``` + +## Integration Points + +### RFC-0130 (ZK-STARK) +Replace placeholder `verifyStarkImmediate()` with actual winterfell/starky verification: + +```zig +// Production integration +const winterfell = @import("winterfell"); + +fn verifyStarkImmediate(proof: StarkProof) !bool { + return winterfell.verify( + proof.data, + TollClearanceAir{}, // Constraint system + proof.public_inputs, + ); +} +``` + +### RFC-0205 (Passport) +Nullifiers are derived from Passport soul keys: + +```zig +const nullifier = Nullifier.fromCommitment( + commitment, + passport.soul_key, +); +``` + +### RFC-0648 (Hamiltonian) +Toll bands are adjusted by PID controller output: + +```zig +const adjusted_band = hamiltonian.scaleTollBand( + base_band, + velocity_error, +); +``` + +## Testing + +Run all tests: +```bash +zig build test +``` + +Tests cover: +- Toll band range checking +- Commitment determinism +- Replay prevention +- Immediate vs lazy verification +- Batch queue mechanics + +## Kenya Compliance + +The implementation supports "Lean Tolls" for low-resource environments: + +1. **Compressed proofs**: <5KB recursive STARKs +2. **Lazy verification**: Accept first, verify in batch +3. **Memory efficient**: Bounded nullifier cache with GC +4. **Bandwidth optimized**: Batch multiple tolls in one verification + +## Next Steps + +- [ ] Integrate winterfell for real STARK verification +- [ ] Add recursive proof compression +- [ ] Implement QVL trust-scaled discounts +- [ ] Hamiltonian velocity coupling +- [ ] Wire Frame L0 transport integration + +## References + +- RFC-0315: Privacy-Preserving Access Tolls +- RFC-0130: ZK-STARK Primitive Layer +- RFC-0205: ChapterPassport Protocol +- RFC-0648: Hamiltonian Economic Dynamics diff --git a/src/access-toll/build.zig b/src/access-toll/build.zig new file mode 100644 index 0000000..5375d1d --- /dev/null +++ b/src/access-toll/build.zig @@ -0,0 +1,50 @@ +const std = @import("std"); + +pub fn build(b: *std.Build) void { + const target = b.standardTargetOptions(.{}); + const optimize = b.standardOptimizeOption(.{}); + + // Main library + const lib = b.addLibrary(.{ + .linkage = .static, + .name = "access-toll", + .root_module = b.createModule(.{ + .root_source_file = b.path("toll_verifier.zig"), + .target = target, + .optimize = optimize, + }), + }); + b.installArtifact(lib); + + // Executable for demo + const exe = b.addExecutable(.{ + .name = "toll-verifier-demo", + .root_module = b.createModule(.{ + .root_source_file = b.path("toll_verifier.zig"), + .target = target, + .optimize = optimize, + }), + }); + b.installArtifact(exe); + + // Run command + const run_cmd = b.addRunArtifact(exe); + run_cmd.step.dependOn(b.getInstallStep()); + if (b.args) |args| { + run_cmd.addArgs(args); + } + const run_step = b.step("run", "Run the demo"); + run_step.dependOn(&run_cmd.step); + + // Tests + const lib_unit_tests = b.addTest(.{ + .root_module = b.createModule(.{ + .root_source_file = b.path("toll_verifier.zig"), + .target = target, + .optimize = optimize, + }), + }); + const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests); + const test_step = b.step("test", "Run unit tests"); + test_step.dependOn(&run_lib_unit_tests.step); +} diff --git a/src/access-toll/toll_verifier.zig b/src/access-toll/toll_verifier.zig new file mode 100644 index 0000000..bbf5a3e --- /dev/null +++ b/src/access-toll/toll_verifier.zig @@ -0,0 +1,578 @@ +// RFC-0315: Privacy-Preserving Access Tolls - Zig Verifier PoC +// Status: IMPLEMENTATION v0.1.0 +// License: EUPL-1.2 + +const std = @import("std"); +const crypto = std.crypto; +const hash = crypto.hash; + +/// STARK Proof structure (placeholder - real impl uses winterfell/starky) +pub const StarkProof = struct { + // FRI layers, constraint evaluations, etc. + // Simplified for PoC - in production this is ~2-5KB recursive proof + data: []const u8, + + pub fn deinit(self: *StarkProof, allocator: std.mem.Allocator) void { + allocator.free(self.data); + } +}; + +/// Compressed proof for Kenya compliance (<5KB) +pub const CompressedProof = struct { + recursive_root: [32]u8, + compressed_data: []const u8, + + pub fn deinit(self: *CompressedProof, allocator: std.mem.Allocator) void { + allocator.free(self.compressed_data); + } +}; + +/// Toll band defines acceptable price range (range proof) +pub const TollBand = struct { + min: u64, + max: u64, + target: u64, + + pub fn contains(self: TollBand, amount: u64) bool { + return amount >= self.min and amount <= self.max; + } +}; + +/// Commitment to toll payment (opaque, privacy-preserving) +pub const TollCommitment = struct { + hash: [32]u8, // blake3(resource_id || amount || nonce) + + pub fn compute( + _allocator: std.mem.Allocator, // Reserved for future use + resource_id: []const u8, + amount: u64, + nonce: [16]u8, + ) ![32]u8 { + _ = _allocator; // Explicitly ignore for now + + var hasher = hash.Blake3.init(.{}); + + // Hash components + hasher.update(resource_id); + + var amount_bytes: [8]u8 = undefined; + std.mem.writeInt(u64, &amount_bytes, amount, .little); + hasher.update(&amount_bytes); + + hasher.update(&nonce); + + var result: [32]u8 = undefined; + hasher.final(&result); + return result; + } +}; + +/// Anti-replay nullifier +pub const Nullifier = struct { + value: [32]u8, + + pub fn fromCommitment(commitment: [32]u8, secret_key: [32]u8) [32]u8 { + var hasher = hash.Blake3.init(.{}); + hasher.update(&commitment); + hasher.update(&secret_key); + var result: [32]u8 = undefined; + hasher.final(&result); + return result; + } +}; + +/// Toll clearance proof - ZK-STARK #10 from RFC-0130 +pub const TollClearanceProof = struct { + stark_proof: StarkProof, + compressed: ?CompressedProof, // Kenya mode + commitment_hash: [32]u8, + nullifier: [32]u8, // Anti-replay + toll_band: TollBand, + + pub fn deinit(self: *TollClearanceProof, allocator: std.mem.Allocator) void { + self.stark_proof.deinit(allocator); + if (self.compressed) |*comp| { + comp.deinit(allocator); + } + } +}; + +/// Verification result +pub const VerificationResult = enum { + valid, + invalid_commitment, + invalid_stark, + replay_detected, + band_violation, +}; + +/// Pending toll for lazy verification (Kenya mode) +pub const PendingToll = struct { + proof: TollClearanceProof, + received_at: i64, // timestamp + + pub fn deinit(self: *PendingToll, allocator: std.mem.Allocator) void { + self.proof.deinit(allocator); + } +}; + +/// Lazy batch queue for resource-constrained routers +pub const LazyBatch = struct { + pending: std.ArrayList(PendingToll), + gpa: std.mem.Allocator, + deadline: i64, + max_size: usize, + + const BATCH_SIZE_DEFAULT = 100; + const BATCH_WINDOW_MS = 5000; // 5 seconds + + pub fn init(gpa: std.mem.Allocator, max_size: ?usize) LazyBatch { + return .{ + .pending = .empty, + .gpa = gpa, + .deadline = std.time.milliTimestamp() + BATCH_WINDOW_MS, + .max_size = max_size orelse BATCH_SIZE_DEFAULT, + }; + } + + pub fn deinit(self: *LazyBatch) void { + for (self.pending.items) |*item| { + item.deinit(self.gpa); + } + self.pending.deinit(self.gpa); + } + + /// Add proof to batch (optimistic acceptance) + pub fn enqueue(self: *LazyBatch, proof: TollClearanceProof) !void { + if (self.pending.items.len >= self.max_size) { + return error.BatchFull; + } + + const pending_item = PendingToll{ + .proof = proof, + .received_at = std.time.milliTimestamp(), + }; + + try self.pending.append(self.gpa, pending_item); + } + + /// Check if batch should flush + pub fn shouldFlush(self: *LazyBatch) bool { + const now = std.time.milliTimestamp(); + return now >= self.deadline or self.pending.items.len >= self.max_size; + } + + /// Get pending proofs for batch verification + pub fn flush(self: *LazyBatch) []PendingToll { + const result = self.pending.toOwnedSlice(self.gpa) catch return &[_]PendingToll{}; + self.deadline = std.time.milliTimestamp() + BATCH_WINDOW_MS; + return result; + } +}; + +/// Nullifier cache for replay prevention +pub const NonceCache = struct { + spent: std.AutoHashMap([32]u8, i64), + max_age_ms: i64, + + pub fn init(allocator: std.mem.Allocator, max_age_ms: ?i64) NonceCache { + return .{ + .spent = std.AutoHashMap([32]u8, i64).init(allocator), + .max_age_ms = max_age_ms orelse (24 * 60 * 60 * 1000), // 24h default + }; + } + + pub fn deinit(self: *NonceCache) void { + self.spent.deinit(); + } + + pub fn contains(self: *NonceCache, nullifier: [32]u8) bool { + return self.spent.contains(nullifier); + } + + pub fn markSpent(self: *NonceCache, nullifier: [32]u8) !void { + const now = std.time.milliTimestamp(); + try self.spent.put(nullifier, now); + } + + /// Clean old entries (call periodically) + pub fn gc(self: *NonceCache) void { + const now = std.time.milliTimestamp(); + var iter = self.spent.iterator(); + while (iter.next()) |entry| { + if (now - entry.value_ptr.* > self.max_age_ms) { + _ = self.spent.remove(entry.key_ptr.*); + } + } + } +}; + +/// Router context for verification decisions +pub const RouterContext = struct { + is_kenya_mode: bool, + resource_constrained: bool, + current_load: f32, // 0.0 - 1.0 + + pub fn shouldLazyVerify(self: RouterContext) bool { + return self.is_kenya_mode or self.resource_constrained or self.current_load > 0.8; + } +}; + +/// Main Toll Verifier - RFC-0315 Section 7.2 +pub const TollVerifier = struct { + allocator: std.mem.Allocator, + nonce_cache: NonceCache, + batch_queue: LazyBatch, + verified_count: u64, + rejected_count: u64, + + pub fn init(allocator: std.mem.Allocator) TollVerifier { + return .{ + .allocator = allocator, + .nonce_cache = NonceCache.init(allocator, null), + .batch_queue = LazyBatch.init(allocator, null), + .verified_count = 0, + .rejected_count = 0, + }; + } + + pub fn deinit(self: *TollVerifier) void { + self.nonce_cache.deinit(); + self.batch_queue.deinit(); + } + + /// Verify a toll clearance proof + /// Returns true if valid (or optimistically accepted for lazy mode) + pub fn verifyToll( + self: *TollVerifier, + proof: TollClearanceProof, + context: RouterContext, + ) !VerificationResult { + // 1. Check nullifier not spent (anti-replay) + if (self.nonce_cache.contains(proof.nullifier)) { + self.rejected_count += 1; + return .replay_detected; + } + + // 2. Verify commitment format (basic sanity check) + if (!self.verifyCommitmentFormat(proof.commitment_hash)) { + self.rejected_count += 1; + return .invalid_commitment; + } + + // 3. Route based on resource context + if (context.shouldLazyVerify()) { + // Lazy verification - accept now, verify in batch later + try self.batch_queue.enqueue(proof); + + // Mark nullifier as pending (will be finalized on batch verify) + try self.nonce_cache.markSpent(proof.nullifier); + self.verified_count += 1; + return .valid; + } else { + // Immediate verification + const result = try self.verifyStarkImmediate(proof); + if (result == .valid) { + try self.nonce_cache.markSpent(proof.nullifier); + self.verified_count += 1; + } else { + self.rejected_count += 1; + } + return result; + } + } + + /// Verify commitment hash format (not cryptographic verification) + fn verifyCommitmentFormat(_: *TollVerifier, commitment: [32]u8) bool { + // Non-zero check + var all_zero = true; + for (commitment) |b| { + if (b != 0) { + all_zero = false; + break; + } + } + return !all_zero; + } + + /// Immediate STARK verification (production: calls winterfell/starky) + fn verifyStarkImmediate(_: *TollVerifier, proof: TollClearanceProof) !VerificationResult { + // PoC: Simulate verification + // In production: verify FRI layers, constraint satisfaction, etc. + + // Check if proof data exists + if (proof.stark_proof.data.len == 0) { + return .invalid_stark; + } + + // Check compressed proof if Kenya mode + if (proof.compressed) |comp| { + if (comp.compressed_data.len == 0) { + return .invalid_stark; + } + } + + return .valid; + } + + /// Process batch queue if ready + pub fn processBatch(self: *TollVerifier) !void { + if (!self.batch_queue.shouldFlush()) { + return; + } + + const pending = self.batch_queue.flush(); + defer self.allocator.free(pending); + + // In production: generate recursive STARK proving all pending + // For PoC: just verify individually + for (pending) |*item| { + _ = try self.verifyStarkImmediate(item.proof); + // In production: collect failures for rollback + } + } + + /// Get verification statistics + pub fn getStats(self: *TollVerifier) struct { verified: u64, rejected: u64 } { + return .{ + .verified = self.verified_count, + .rejected = self.rejected_count, + }; + } +}; + +// ============================================================================ +// TESTS +// ============================================================================ + +test "TollBand contains" { + const band = TollBand{ + .min = 100, + .max = 500, + .target = 250, + }; + + try std.testing.expect(band.contains(100)); + try std.testing.expect(band.contains(250)); + try std.testing.expect(band.contains(500)); + try std.testing.expect(!band.contains(50)); + try std.testing.expect(!band.contains(600)); +} + +test "TollCommitment computation" { + const allocator = std.testing.allocator; + + const resource_id = "test-resource-123"; + const amount: u64 = 250; + const nonce = [_]u8{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}; + + const commitment = try TollCommitment.compute(allocator, resource_id, amount, nonce); + + // Verify deterministic + const commitment2 = try TollCommitment.compute(allocator, resource_id, amount, nonce); + try std.testing.expectEqual(commitment, commitment2); + + // Different inputs = different outputs + const commitment3 = try TollCommitment.compute(allocator, resource_id, amount + 1, nonce); + var all_same = true; + for (commitment, commitment3) |a, b| { + if (a != b) { + all_same = false; + break; + } + } + try std.testing.expect(!all_same); +} + +test "NonceCache replay prevention" { + const allocator = std.testing.allocator; + var cache = NonceCache.init(allocator, null); + defer cache.deinit(); + + const nullifier = [_]u8{1} ** 32; + + try std.testing.expect(!cache.contains(nullifier)); + try cache.markSpent(nullifier); + try std.testing.expect(cache.contains(nullifier)); +} + +test "TollVerifier immediate verify" { + const allocator = std.testing.allocator; + var verifier = TollVerifier.init(allocator); + defer verifier.deinit(); + + // Create a valid proof + const proof = TollClearanceProof{ + .stark_proof = .{ .data = "valid-proof-data" }, + .compressed = null, + .commitment_hash = [_]u8{1} ** 32, + .nullifier = [_]u8{2} ** 32, + .toll_band = .{ .min = 100, .max = 500, .target = 250 }, + }; + + const context = RouterContext{ + .is_kenya_mode = false, + .resource_constrained = false, + .current_load = 0.5, + }; + + const result = try verifier.verifyToll(proof, context); + try std.testing.expectEqual(result, .valid); + + // Verify replay detection + const result2 = try verifier.verifyToll(proof, context); + try std.testing.expectEqual(result2, .replay_detected); +} + +test "TollVerifier lazy batch mode" { + const allocator = std.testing.allocator; + var verifier = TollVerifier.init(allocator); + defer verifier.deinit(); + + const context = RouterContext{ + .is_kenya_mode = true, // Enable lazy mode + .resource_constrained = false, + .current_load = 0.5, + }; + + // Enqueue multiple proofs + var i: usize = 0; + while (i < 5) : (i += 1) { + const proof = TollClearanceProof{ + .stark_proof = .{ .data = try allocator.dupe(u8, "proof-data") }, + .compressed = null, + .commitment_hash = [_]u8{@intCast(i + 1)} ** 32, + .nullifier = [_]u8{@intCast(i + 10)} ** 32, + .toll_band = .{ .min = 100, .max = 500, .target = 250 }, + }; + + const result = try verifier.verifyToll(proof, context); + try std.testing.expectEqual(result, .valid); + } + + // Check batch queue has items + try std.testing.expect(verifier.batch_queue.pending.items.len > 0); + + // Process batch + try verifier.processBatch(); + + // Check stats + const stats = verifier.getStats(); + try std.testing.expectEqual(stats.verified, 5); +} + +test "Nullifier generation" { + const commitment = [_]u8{1, 2, 3} ++ [_]u8{0} ** 29; + const secret_key = [_]u8{4, 5, 6} ++ [_]u8{0} ** 29; + + const nullifier = Nullifier.fromCommitment(commitment, secret_key); + const nullifier2 = Nullifier.fromCommitment(commitment, secret_key); + + // Deterministic + try std.testing.expectEqual(nullifier, nullifier2); + + // Different inputs = different outputs + const different_key = [_]u8{7, 8, 9} ++ [_]u8{0} ** 29; + const nullifier3 = Nullifier.fromCommitment(commitment, different_key); + var all_same = true; + for (nullifier, nullifier3) |a, b| { + if (a != b) { + all_same = false; + break; + } + } + try std.testing.expect(!all_same); +} + +// Demo/example usage +pub fn main() !void { + var gpa = std.heap.GeneralPurposeAllocator(.{}){}; + defer _ = gpa.deinit(); + const allocator = gpa.allocator(); + + std.debug.print("=== RFC-0315 Toll Verifier PoC ===\n\n", .{}); + + // Initialize verifier + var verifier = TollVerifier.init(allocator); + defer verifier.deinit(); + + std.debug.print("[1] Verifier initialized\n", .{}); + + // Create a toll commitment + const resource_id = "premium-feed-access"; + const amount: u64 = 250; + const nonce = [_]u8{0xAB} ** 16; + + const commitment = try TollCommitment.compute(allocator, resource_id, amount, nonce); + std.debug.print("[2] Commitment computed: ", .{}); + for (commitment) |b| { + std.debug.print("{x:0>2}", .{b}); + } + std.debug.print("\n", .{}); + + // Create proof (in production: generated via ZK-STARK) + const proof = TollClearanceProof{ + .stark_proof = .{ .data = "stark-proof-placeholder" }, + .compressed = null, + .commitment_hash = commitment, + .nullifier = Nullifier.fromCommitment(commitment, [_]u8{0xCD} ** 32), + .toll_band = .{ .min = 100, .max = 500, .target = 250 }, + }; + + // Verify in normal mode + const normal_context = RouterContext{ + .is_kenya_mode = false, + .resource_constrained = false, + .current_load = 0.5, + }; + + const result = try verifier.verifyToll(proof, normal_context); + std.debug.print("[3] Immediate verification: {s}\n", .{@tagName(result)}); + + // Demonstrate Kenya mode (lazy batching) + std.debug.print("\n[4] Kenya Mode (lazy batching):\n", .{}); + + const kenya_context = RouterContext{ + .is_kenya_mode = true, + .resource_constrained = true, + .current_load = 0.9, + }; + + // Simulate 10 tolls + var i: usize = 0; + while (i < 10) : (i += 1) { + const k_commitment = try TollCommitment.compute( + allocator, + resource_id, + amount + @as(u64, @intCast(i)), // Varying amounts + [_]u8{@intCast(i)} ** 16, + ); + + const k_proof = TollClearanceProof{ + .stark_proof = .{ .data = try allocator.dupe(u8, "kenya-proof") }, + .compressed = .{ + .recursive_root = [_]u8{0xFF} ** 32, + .compressed_data = try allocator.dupe(u8, "compressed"), + }, + .commitment_hash = k_commitment, + .nullifier = Nullifier.fromCommitment(k_commitment, [_]u8{@intCast(i)} ** 32), + .toll_band = .{ .min = 100, .max = 600, .target = 300 }, + }; + + const k_result = try verifier.verifyToll(k_proof, kenya_context); + std.debug.print(" Toll {d}: {s} (queued)\n", .{ i + 1, @tagName(k_result) }); + } + + // Process batch + try verifier.processBatch(); + std.debug.print("[5] Batch processed\n", .{}); + + // Final stats + const stats = verifier.getStats(); + std.debug.print("\n[Stats] Verified: {d}, Rejected: {d}\n", .{ + stats.verified, + stats.rejected + }); + + std.debug.print("\n=== RFC-0315 PoC Complete ===\n", .{}); +}