{
 "format": 1,
 "label": "ContraCosta.CA",
 "fips": 6013,
 "epoch": 1,
 "month": "2026-10",
 "merkle_root": "3003405942911459bb6949d77fb89dbdcc290c8e31d3cb9325f43672090f355e",
 "pda": "GUzpYDmKua28ekCDwyak43eM8vmAGypm5RLiKfxL8fNp",
 "program": "7mi96nPvP6SB1eApAd7vN2uUEBDvNR9xVvLqPDt3uvwg",
 "packet_file": "ContraCosta.CA.1.2026-10.csv",
 "packet_sha256": "e8cca9957bd62db3efd339c4562d9d836527150f55438ba60efb8ce4963b163c",
 "n_parcels": 387593,
 "chunk_size": 2048,
 "n_chunks": 190,
 "n_shards": 259,
 "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": 45,
 "alias_types": [],
 "has_prefix": true,
 "prefix_len": 3,
 "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."
}