{
 "format": 1,
 "label": "Hampden.MA",
 "fips": 25013,
 "epoch": 1,
 "month": "2026-10",
 "merkle_root": "708dc85bdabe7cb39f36284c895299db800d9c30b6fa392860d0b824431bf71c",
 "pda": "3ZHtNdFhdqoGULcRp86oV2NvK56x6DJeK4Gpz6ejpmix",
 "program": "7mi96nPvP6SB1eApAd7vN2uUEBDvNR9xVvLqPDt3uvwg",
 "packet_file": "Hampden.MA.1.2026-10.csv",
 "packet_sha256": "cbdfbe27afa6b008ea4576f0ba89a19c44a25231307a17a436b8864bca49380d",
 "n_parcels": 155453,
 "chunk_size": 2048,
 "n_chunks": 76,
 "n_shards": 104,
 "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": 5,
 "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."
}