{
 "chain": {
  "name": "Robinhood Chain",
  "id": 4663,
  "testnet_id": 46630,
  "stack": "Arbitrum Orbit",
  "settles_to": "Ethereum",
  "gas_token": "ETH",
  "explorer": "https://robinhoodchain.blockscout.com",
  "testnet_explorer": "https://explorer.testnet.chain.robinhood.com",
  "da": "Ethereum blobs",
  "block_time_ms": 100,
  "withdrawal_challenge_days": 7,
  "source": "docs.robinhood.com/chain"
 },
 "token_standard": "ERC-1155",
 "standard_rationale": "Redemption is lot-specific: a holder draws rice from a named warehouse lot, not from a pooled balance. One fungible id per lot preserves that; a single ERC-20 supply would not.",
 "unit": {
  "token": 1,
  "hyo": 1,
  "kg": 60
 },
 "epoch": {
  "sekki": "立冬",
  "romaji": "rittō",
  "note": "All eight vaults seal within the same fortnight, so the reserve has one settlement epoch per year."
 },
 "finality": [
  {
   "stage": "Soft confirmation",
   "ja": "仮受",
   "latency": "sub-second",
   "chain": "Sequencer has accepted, ordered and executed the transaction.",
   "warehouse": "Rice weighed at the gate. The receipt is written but not yet countersigned — the warehouse can still reject the lot.",
   "receipt_state": "issued"
  },
  {
   "stage": "Posted to Ethereum",
   "ja": "記帳",
   "latency": "minutes",
   "chain": "Batch posted to the L1 Inbox. Ordering is fixed unless Ethereum itself reorganises.",
   "warehouse": "Receipt entered in the 蔵帳 warehouse book and sealed. The lot is now the depositor's on the warehouse's own record.",
   "receipt_state": "sealed"
  },
  {
   "stage": "Ethereum finality",
   "ja": "確定",
   "latency": "~13 min after posting",
   "chain": "The L1 block containing the batch is final. Irreversible.",
   "warehouse": "Receipt is negotiable. It can be sold, pledged, or presented for redemption against the named lot.",
   "receipt_state": "redeemable"
  }
 ],
 "lineage": [
  {
   "ja": "蔵屋敷",
   "edo": "Domain warehouse in Osaka",
   "now": "Bonded prefectural warehouse",
   "role": "custodian"
  },
  {
   "ja": "米切手",
   "edo": "Rice bill — receipt for a named stored lot",
   "now": "ERC-1155 token id, one per lot",
   "role": "instrument"
  },
  {
   "ja": "蔵帳",
   "edo": "Warehouse book listing every deposit",
   "now": "Contract storage + Blockscout",
   "role": "ledger"
  },
  {
   "ja": "正米取引",
   "edo": "Spot trade in the bill itself",
   "now": "Transfer of the token",
   "role": "settlement"
  },
  {
   "ja": "旗振り通信",
   "edo": "Flag-signal relay carrying the Dōjima price",
   "now": "Oracle price feed",
   "role": "price transport"
  },
  {
   "ja": "引換",
   "edo": "Presentation of the bill to draw the rice",
   "now": "Burn against a lot id",
   "role": "redemption"
  }
 ],
 "abi": [
  {
   "sig": "issue(uint256,uint256,bytes32,bytes32,(uint16,uint16,uint16,bool,bool,bool),address)",
   "note": "Mint supply for a lot id. Reverts unless all three stored years are Special-A and consecutive — the grade floor has no bypass path.",
   "selector": "0x02db95a9"
  },
  {
   "sig": "redeem(uint256,uint256)",
   "note": "Burn n tokens against a lot id. Emits the claim the warehouse settles against. Supply retires permanently.",
   "selector": "0x7cbc2373"
  },
  {
   "sig": "gradeOf(uint256)",
   "note": "Returns the three stored grade years for a lot id.",
   "selector": "0x1ac9a7d2"
  },
  {
   "sig": "receiptOf(uint256)",
   "note": "Returns the warehouse receipt serial bound to a lot id.",
   "selector": "0x45164e7b"
  },
  {
   "sig": "kgOf(address,uint256)",
   "note": "Kilograms of rice backing a holder's position in a lot.",
   "selector": "0x74bead1f"
  },
  {
   "sig": "balanceOf(address,uint256)",
   "note": "ERC-1155 standard balance.",
   "selector": "0x00fdd58e"
  },
  {
   "sig": "TransferSingle(address,address,address,uint256,uint256)",
   "note": "ERC-1155 standard transfer event.",
   "selector": "0xc3d58168"
  }
 ],
 "lots": [
  {
   "key": "uonuma",
   "district_en": "Uonuma",
   "district_ja": "魚沼",
   "pref_en": "Niigata",
   "serial": "FF3F-ED1F",
   "token_id": "17926042532076787499",
   "token_id_hex": "0xf8c618b4e8fb172b",
   "salt": "0x8710c562dfc1100c3f128dd6bc89d90ef0f35fcce657439ebcda5ba3f5f7ecbd",
   "address": "0x132da36067F2EbcF9e9065aA751a90A50072A682",
   "supply": 11400,
   "lots": 9,
   "grade_ok": true
  },
  {
   "key": "akita_s",
   "district_en": "Southern Akita",
   "district_ja": "県南",
   "pref_en": "Akita",
   "serial": "F4AE-6043",
   "token_id": "8115244861350683178",
   "token_id_hex": "0x709f24347a1f222a",
   "salt": "0xc13bcdf608e1bdabe8606007528977c2675b0237152d6574f18e38ef29496a8d",
   "address": "0xe5ae76D4dD158E57424b1029D77AB720b7EBfDF1",
   "supply": 8100,
   "lots": 7,
   "grade_ok": true
  },
  {
   "key": "okitama",
   "district_en": "Okitama",
   "district_ja": "置賜",
   "pref_en": "Yamagata",
   "serial": "9913-2719",
   "token_id": "15897273904299770453",
   "token_id_hex": "0xdc9e76637ae00255",
   "salt": "0x5cbbb3780e09104cecd783ee78f3c4882f7267dd7b0312fe4bf3d24ad0cef399",
   "address": "0xde57699cb3c167Fd4558A905ADcf807100Aaeb56",
   "supply": 5400,
   "lots": 6,
   "grade_ok": true
  },
  {
   "key": "kamikawa",
   "district_en": "Kamikawa",
   "district_ja": "上川",
   "pref_en": "Hokkaido",
   "serial": "6EA5-9F2D",
   "token_id": "15005573460681597675",
   "token_id_hex": "0xd03e818f3ef4a2eb",
   "salt": "0x040d97da20e4c104a7fa58bd1716e8cc9dd12e822768c2009a005fcc56283b5f",
   "address": "0xd43c0834779a6343BBDF84A0e18C92eA74c7CFf3",
   "supply": 4800,
   "lots": 5,
   "grade_ok": true
  },
  {
   "key": "tsugaru",
   "district_en": "Tsugaru",
   "district_ja": "津軽",
   "pref_en": "Aomori",
   "serial": "2DC1-0DED",
   "token_id": "6055786295414028201",
   "token_id_hex": "0x540a798cfdd4f7a9",
   "salt": "0x3de5d269ac522bc37ffe444ed25eca949b54270bfa6eac1745fd7d032ba21b72",
   "address": "0x115715fc027Aa2b62c0d6122735a49Eed13E8dDA",
   "supply": 3600,
   "lots": 4,
   "grade_ok": true
  },
  {
   "key": "izumo",
   "district_en": "Izumo",
   "district_ja": "出雲",
   "pref_en": "Shimane",
   "serial": "4F1B-80F9",
   "token_id": "8295708316237447393",
   "token_id_hex": "0x732046c2d59640e1",
   "salt": "0xb519f327ea12aa461b574332f02a7ab55b138b81de06d479cb574d38eb7b2bc1",
   "address": "0x0c33105566027C750388152eED2BC0b00e9e8B43",
   "supply": 3300,
   "lots": 4,
   "grade_ok": true
  },
  {
   "key": "oita_w",
   "district_en": "Western Oita",
   "district_ja": "県西部",
   "pref_en": "Oita",
   "serial": "A303-5CA0",
   "token_id": "7417844648150247289",
   "token_id_hex": "0x66f17a67f4072779",
   "salt": "0x7abe8d3c1849b68c8b5af512a1b57d30bf2ce62dc6b0071bb0e87038feff12b4",
   "address": "0xFfeC3d69bE35363E82b8ca1ffdeF490057D2c76E",
   "supply": 2700,
   "lots": 3,
   "grade_ok": true
  },
  {
   "key": "kagoshima_n",
   "district_en": "Northern Kagoshima",
   "district_ja": "県北部",
   "pref_en": "Kagoshima",
   "serial": "F317-BDD9",
   "token_id": "7278430485346575487",
   "token_id_hex": "0x65022df6b174e47f",
   "salt": "0x3d2c82c593802e1afe434156cbf61da841344d7d63554e8b045f67f021592735",
   "address": "0x56a6b1F27878736fd64f7d716665faeA76687AAD",
   "supply": 2700,
   "lots": 2,
   "grade_ok": true
  }
 ],
 "totals": {
  "lots": 8,
  "supply": 42000
 }
}