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#!/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:]))
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