KOKanıtlanabilir Adil

Test vektörleri

1// KOCase dice v1 — reference verifier. WebCrypto only: Bun, Deno, Node 20+ or a browser.2export async function verifyDiceV1(3  serverSeedHex: string, // the revealed server seed: 64 lowercase hex characters4  hashScheme: 'bytes' | 'hex', // what the seed's published hash was taken over5  clientSeed: string,6  nonce: bigint, // the first bet on a seed is nonce 17  target: number, // a multiple of 0.018  direction: 'over' | 'under',9  wager: bigint, // in base units: 10^-6 KC10) {11  if (!/^[0-9a-f]{64}$/.test(serverSeedHex)) throw new Error('the server seed must be 64 lowercase hex characters');12  if (hashScheme !== 'bytes' && hashScheme !== 'hex') throw new Error('the hash scheme is bytes or hex');13  const { subtle } = globalThis.crypto;14  const hex = (b: ArrayBuffer) => [...new Uint8Array(b)].map((x) => x.toString(16).padStart(2, '0')).join('');15  const seed = new Uint8Array(serverSeedHex.match(/../g)!.map((h) => parseInt(h, 16)));16  const committed = hashScheme === 'hex' ? new TextEncoder().encode(serverSeedHex) : seed; // 'hex': the 64-character text; 'bytes': the 32 bytes it spells17  const serverSeedHash = hex(await subtle.digest('SHA-256', committed));18  const key = await subtle.importKey('raw', seed, { name: 'HMAC', hash: 'SHA-256' }, false, ['sign']);19  const message = new TextEncoder().encode(`${clientSeed}:${nonce}`);20  const mac = new DataView(await subtle.sign('HMAC', key, message));21  let roll: number | undefined;22  for (let offset = 0; offset < 32 && roll === undefined; offset += 4) {23    const value = mac.getUint32(offset); // big-endian24    if (value < 4_294_960_000) roll = (value % 10_000) / 100; // floor(2^32 / 10000) * 1000025  }26  if (roll === undefined) throw new Error('all eight windows rejected: the server refuses this bet');27  const chance = direction === 'over' ? 99.99 - target : target; // percent, in doubles as the server does28  const scaled = BigInt(Math.floor((95 / chance) * 1_000_000)); // multiplier, floored to 6 decimals29  const win = direction === 'over' ? roll > target : roll < target; // a roll equal to the target loses30  const payout = win ? (wager * scaled) / 1_000_000n : 0n; // bigint division floors31  const multiplier = `${scaled / 1_000_000n}.${(scaled % 1_000_000n).toString().padStart(6, '0')}`;32  return { serverSeedHash, roll, win, multiplier, payout };33}