Farmland Token

interface FarmlandMetadata {
  location:          string;   // GPS coordinates, e.g. "12.0022, 8.5919"
  areaSqMeters:      bigint;   // Total area in square metres
  soilType:          string;   // e.g. "loam", "clay", "sandy-loam"
  irrigationType:    string;   // e.g. "rain-fed", "drip", "canal"
  cropHistory:       string;   // Comma-separated, e.g. "maize,sorghum,fallow"
  titleDocumentHash: string;   // bytes32 — IPFS hash of title document
  valuationUSD:      bigint;   // 18 decimals (ethers.parseEther)
  stateRegion:       string;   // e.g. "Kano State", "Western Region"
  lastUpdated:       bigint;   // Unix timestamp (auto-set by contract)
}

const result = await factory.deployFarmland({
  name:        "Kano Farmland Token",
  symbol:      "KFT",
  assetId:     "KANO-FARM-001",
  countryCode: "NG",
  metadata: {
    location:          "12.0022, 8.5919",
    areaSqMeters:      BigInt(50000),
    soilType:          "loam",
    irrigationType:    "rain-fed",
    cropHistory:       "maize,sorghum,fallow",
    titleDocumentHash: ethers.ZeroHash,
    valuationUSD:      ethers.parseEther("125000"),
    stateRegion:       "Kano State",
    lastUpdated:       BigInt(Math.floor(Date.now() / 1000)),
  },
});

Transfer(address indexed from, address indexed to, uint256 value)
MetadataUpdated(uint256 indexed version, uint256 timestamp)
AssetStatusChanged(uint8 indexed oldStatus, uint8 indexed newStatus, uint256 timestamp)