Dual ledger: tamper-proof transaction tracking on both sides
Every inference request is recorded in a local JSONL ledger with a SHA-256 hash of (id + tokens + duration + cost + shared_secret). Both sides keep independent copies: - Gateway (Matt's): writes to ledger.jsonl on every request - Receiver (Seth's): receives callbacks, saves per-gateway ledger Endpoints: - GET /ledger — view transactions + total cost - GET /reconcile — compare ledger vs stats, verify all hashes - POST /config — adjust cost params live ledger_receiver.py runs on Seth's server: - POST /transaction — receive and verify gateway callbacks - GET /summary — total cost per gateway - GET /ledger — all transactions across gateways If either side resets stats, the other's ledger has the full history. If either side tampers with entries, hash verification catches it. Tested: request → ledger write → reconcile → hash valid → zero discrepancy Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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#!/usr/bin/env python3
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"""
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Ledger Receiver — runs on YOUR server to collect transaction records from remote gateways.
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Each gateway POSTs transactions here. You keep an independent copy of every
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transaction with hash verification. If the gateway operator resets their stats,
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your ledger still has the full history.
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Usage:
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python3 ledger_receiver.py
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LEDGER_SECRET=shared_secret python3 ledger_receiver.py
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Endpoints:
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POST /transaction — receive a transaction from a gateway
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GET /ledger — view all transactions
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GET /reconcile/<host> — compare your ledger against a gateway's
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GET /summary — total cost by gateway
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"""
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import json
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import os
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import hashlib
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import threading
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import time
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from http.server import HTTPServer, BaseHTTPRequestHandler
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from urllib.parse import urlparse
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LISTEN_PORT = int(os.environ.get("RECEIVER_PORT", "8435"))
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LEDGER_DIR = os.environ.get("LEDGER_DIR", "/var/lib/mortdecai-ledger")
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LEDGER_SECRET = os.environ.get("LEDGER_SECRET", "change_me_shared_secret")
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_lock = threading.Lock()
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def _verify_hash(entry):
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raw = f"{entry['id']}|{entry['tokens_in']}|{entry['tokens_out']}|{entry['duration']}|{entry['cost']}|{LEDGER_SECRET}"
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expected = hashlib.sha256(raw.encode()).hexdigest()[:16]
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return entry.get("hash") == expected
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def _save_transaction(entry, source_ip):
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"""Save a transaction to the per-gateway ledger file."""
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entry["_received_at"] = time.strftime("%Y-%m-%dT%H:%M:%SZ")
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entry["_source_ip"] = source_ip
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entry["_hash_valid"] = _verify_hash(entry)
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os.makedirs(LEDGER_DIR, exist_ok=True)
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# One file per source IP
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safe_ip = source_ip.replace(":", "_").replace(".", "_")
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path = os.path.join(LEDGER_DIR, f"ledger_{safe_ip}.jsonl")
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with _lock:
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with open(path, "a") as f:
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f.write(json.dumps(entry) + "\n")
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def _load_all():
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"""Load all ledger entries from all gateways."""
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all_entries = {}
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try:
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for fname in os.listdir(LEDGER_DIR):
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if fname.endswith(".jsonl"):
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gateway = fname.replace("ledger_", "").replace(".jsonl", "")
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entries = []
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with open(os.path.join(LEDGER_DIR, fname)) as f:
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for line in f:
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if line.strip():
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entries.append(json.loads(line))
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all_entries[gateway] = entries
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except:
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pass
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return all_entries
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class ReceiverHandler(BaseHTTPRequestHandler):
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def log_message(self, fmt, *args):
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pass
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def _send_json(self, status, data):
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body = json.dumps(data, indent=2).encode()
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self.send_response(status)
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self.send_header("Content-Type", "application/json")
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self.end_headers()
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self.wfile.write(body)
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def do_POST(self):
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if self.path == "/transaction":
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length = int(self.headers.get("Content-Length", 0))
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entry = json.loads(self.rfile.read(length))
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source_ip = self.client_address[0]
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valid = _verify_hash(entry)
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_save_transaction(entry, source_ip)
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self._send_json(200, {
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"status": "recorded",
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"id": entry.get("id"),
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"hash_valid": valid,
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})
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return
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self._send_json(404, {"error": "not found"})
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def do_GET(self):
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parsed = urlparse(self.path)
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if parsed.path == "/summary":
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all_data = _load_all()
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summary = {}
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for gateway, entries in all_data.items():
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total_cost = sum(e.get("cost", 0) for e in entries)
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total_tokens = sum(e.get("tokens_out", 0) for e in entries)
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valid = sum(1 for e in entries if e.get("_hash_valid", False))
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invalid = len(entries) - valid
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summary[gateway] = {
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"transactions": len(entries),
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"total_cost": round(total_cost, 6),
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"total_tokens_out": total_tokens,
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"hashes_valid": valid,
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"hashes_invalid": invalid,
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}
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self._send_json(200, summary)
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return
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if parsed.path == "/ledger":
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all_data = _load_all()
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flat = []
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for entries in all_data.values():
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flat.extend(entries)
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flat.sort(key=lambda e: e.get("timestamp", ""))
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total = sum(e.get("cost", 0) for e in flat)
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self._send_json(200, {
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"total_transactions": len(flat),
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"total_cost": round(total, 6),
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"last_20": flat[-20:],
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})
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return
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self._send_json(404, {"error": "not found"})
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if __name__ == "__main__":
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os.makedirs(LEDGER_DIR, exist_ok=True)
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print(f"Ledger Receiver on port {LISTEN_PORT}")
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print(f" Ledger dir: {LEDGER_DIR}")
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HTTPServer(("0.0.0.0", LISTEN_PORT), ReceiverHandler).serve_forever()
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