{
 "format": 1,
 "label": "Middlesex.MA",
 "fips": 25017,
 "epoch": 1,
 "month": "2026-10",
 "merkle_root": "763c82bb3422c582c9da48998342816f06bed4d08fa3edde3440a74a9c934f2a",
 "pda": "CyTh8jqUnVBcPktSNUsxHrmXu61ngqbRbXG25fHX2cvx",
 "program": "7mi96nPvP6SB1eApAd7vN2uUEBDvNR9xVvLqPDt3uvwg",
 "packet_file": "Middlesex.MA.1.2026-10.csv",
 "packet_sha256": "986345a82a5a6d51c1e66cdbfa07ff9e9450877e9dd80dc90f3d9f5164eaff2f",
 "n_parcels": 423442,
 "chunk_size": 2048,
 "n_chunks": 207,
 "n_shards": 283,
 "leaf": "sha256(utf8 parcel_id|acres_6dp|lot_sqft_2dp)",
 "tree": "sha256(left||right); odd level duplicates the last node",
 "shard_key": "sha256(utf8(upper(trim(parcel_id))))[0..4] big-endian u32 mod n_shards",
 "note": "Untrusted layout file. Verify against the on-chain CountyRoot account, not against this file.",
 "n_xshards": 1,
 "alias_types": [],
 "has_prefix": true,
 "prefix_len": 6,
 "lookup_note": "x/ and p/ are lookup aids (normalized IDs, county aliases, suggestions). They are not part of the leaf or the on-chain root."
}