1 files changed, 166 insertions, 0 deletions

diff --git a/scripts/verify-fair-launch.py b/scripts/verify-fair-launch.py
new file mode 100644
index 0000000..c33c8be
--- /dev/null
+++ b/scripts/verify-fair-launch.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+"""Produce a deterministic Bitflash fair-launch audit report."""
+
+import argparse
+import hashlib
+import sys
+from pathlib import Path
+
+import bitflash_chain as chain
+
+
+def build_report(blocks, source_mode):
+    genesis = blocks[0]
+    launch_outputs = genesis["transactions"][0]["vout"] if genesis["transactions"] else []
+    coinbase_outputs = []
+    total_mined = 0
+    non_coinbase_txs = 0
+
+    for height, block in enumerate(blocks):
+        if not block["transactions"]:
+            continue
+        cb = block["transactions"][0]
+        if chain.is_coinbase(cb):
+            amount = sum(out["value_satoshis"] for out in cb["vout"])
+            total_mined += amount
+            coinbase_outputs.append({
+                "height": height,
+                "block_hash": block["hash"],
+                "coinbase_txid": cb["txid"],
+                "value_satoshis": amount,
+                "value_btf": chain.format_money(amount),
+                "outputs": cb["vout"],
+            })
+        non_coinbase_txs += sum(1 for tx in block["transactions"] if not chain.is_coinbase(tx))
+
+    checks = {
+        "genesis_hash_matches_source": genesis["hash"] == chain.GENESIS_HASH,
+        "genesis_merkle_matches_source": genesis["merkle_root"] == chain.GENESIS_MERKLE,
+        "computed_merkle_matches_header": genesis["computed_merkle_root"] == genesis["merkle_root"],
+        "genesis_has_single_transaction": genesis["tx_count"] == 1,
+        "genesis_transaction_is_coinbase": bool(genesis["transactions"] and chain.is_coinbase(genesis["transactions"][0])),
+        "genesis_supply_is_50_btf": sum(out["value_satoshis"] for out in launch_outputs) == 50 * chain.COIN,
+    }
+
+    report = {
+        "schema": "bitflash-fair-launch-report-1",
+        "deterministic": True,
+        "source_mode": source_mode,
+        "chain": {
+            "name": "Bitflash",
+            "ticker": "BTF",
+            "message_start_hex": chain.MAGIC.hex(),
+            "coin": chain.COIN,
+        },
+        "source_constants": {
+            "genesis_hash": chain.GENESIS_HASH,
+            "genesis_merkle_root": chain.GENESIS_MERKLE,
+            "genesis_time": chain.GENESIS_TIME,
+            "genesis_time_utc": chain.utc(chain.GENESIS_TIME),
+            "genesis_bits": "0x%08x" % chain.GENESIS_BITS,
+            "genesis_nonce": chain.GENESIS_NONCE,
+            "genesis_message": chain.GENESIS_TEXT,
+        },
+        "scanned": {
+            "block_count": len(blocks),
+            "first_height": 0,
+            "last_height": len(blocks) - 1,
+            "non_coinbase_transactions": non_coinbase_txs,
+            "total_coinbase_satoshis": total_mined,
+            "total_coinbase_btf": chain.format_money(total_mined),
+        },
+        "genesis": {
+            "hash": genesis["hash"],
+            "merkle_root": genesis["merkle_root"],
+            "computed_merkle_root": genesis["computed_merkle_root"],
+            "time": genesis["time"],
+            "time_utc": genesis["time_utc"],
+            "bits": genesis["bits"],
+            "nonce": genesis["nonce"],
+            "tx_count": genesis["tx_count"],
+            "coinbase_txid": genesis["transactions"][0]["txid"] if genesis["transactions"] else "",
+            "outputs": launch_outputs,
+        },
+        "coinbase_outputs": coinbase_outputs,
+        "checks": checks,
+        "verdict": "FAIR_LAUNCH_BASELINE_VERIFIED" if all(checks.values()) else "CHECKS_FAILED",
+        "external_timestamping": {
+            "status": "not_embedded",
+            "recommended": "OpenTimestamps",
+            "instructions": [
+                "Save the canonical JSON report.",
+                "Run: ots stamp bitflash-fair-launch-report.json",
+                "Later verify with: ots verify bitflash-fair-launch-report.json.ots",
+            ],
+        },
+    }
+    report["attestation_payload_sha256"] = hashlib.sha256(chain.canonical_bytes(report)).hexdigest()
+    return report
+
+
+def print_text(report):
+    checks = report["checks"]
+    print("Bitflash fair-launch verifier")
+    print("schema: %s" % report["schema"])
+    print("source: %s" % report["source_mode"])
+    print("attestation payload sha256: %s" % report["attestation_payload_sha256"])
+    print()
+    print("Genesis")
+    print("  hash:    %s" % report["genesis"]["hash"])
+    print("  merkle:  %s" % report["genesis"]["merkle_root"])
+    print("  time:    %s" % report["genesis"]["time_utc"])
+    print("  txs:     %d" % report["genesis"]["tx_count"])
+    print("  supply:  %s BTF" % chain.format_money(sum(o["value_satoshis"] for o in report["genesis"]["outputs"])))
+    print()
+    print("Scanned")
+    print("  blocks:  %d" % report["scanned"]["block_count"])
+    print("  height:  %d..%d" % (report["scanned"]["first_height"], report["scanned"]["last_height"]))
+    print("  minted:  %s BTF" % report["scanned"]["total_coinbase_btf"])
+    print("  normal transactions in range: %d" % report["scanned"]["non_coinbase_transactions"])
+    print()
+    print("Checks")
+    for key in sorted(checks):
+        print("  %s %s" % ("OK  " if checks[key] else "FAIL", key))
+    print()
+    print("Verdict: %s" % report["verdict"])
+    print()
+    print("OpenTimestamps")
+    print("  canonical JSON can be stamped later with: ots stamp <report.json>")
+
+
+def main(argv):
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument("--datadir", default=chain.default_datadir(), help="Bitflash data directory")
+    ap.add_argument("--max-blocks", type=int, default=100, help="number of blocks to scan from blk*.dat")
+    ap.add_argument("--json", action="store_true", help="print canonical JSON")
+    ap.add_argument("--out", help="write canonical JSON to this path")
+    ap.add_argument("--reconstruct-genesis", action="store_true",
+                    help="do not read disk; reconstruct only the genesis block from source constants")
+    args = ap.parse_args(argv)
+
+    if args.reconstruct_genesis:
+        blocks = [chain.reconstructed_genesis()]
+        source_mode = "reconstructed-genesis"
+    else:
+        blocks = chain.read_blocks(args.datadir, args.max_blocks)
+        if not blocks:
+            raise SystemExit("no Bitflash blocks found in %s; use --reconstruct-genesis for a source-only check" % args.datadir)
+        source_mode = "local-block-files"
+
+    try:
+        report = build_report(blocks, source_mode)
+    except chain.ParseError as e:
+        raise SystemExit(str(e))
+    data = chain.canonical_bytes(report)
+
+    if args.out:
+        Path(args.out).write_bytes(data)
+    if args.json:
+        sys.stdout.buffer.write(data)
+    else:
+        print_text(report)
+    return 0 if report["verdict"] == "FAIR_LAUNCH_BASELINE_VERIFIED" else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main(sys.argv[1:]))