MoneyPot.com - Seeding event | Bitcointalksearch.org

Welcome to MoneyPot's provably fair seeding event.

Our provably fair system is based on the first seeding event, but instead of salting each hash in the chain with a client seed, a Vx signature will be used. This preserves all provably fair guarantees while allowing third-party auditing.

Starting with a server secret, I have generated a chain of 100,000,000 sha256 hashes by recursively hashing the previous hash. The hash of the chain's last element is cd01fbf68ac526970f016e07d7b92e58d49322f02387e4a952037dc5f605f016. This is also our commitment to Vx.

The reference code we use to determine game results is as follows:

Code:

const crypto = require("crypto")

// The function that calculates game results
function gameResult(hash, vxSignature, casinoBankroll, playerBetting) {
  const X = scaledOutcome(hash, vxSignature)
  return (casinoBankroll + 2 * playerBetting) / (-scaledOutcome * casinoBankroll + casinoBankroll + 2 * playerBetting)
}

// The pure probability of the casino winning, before taking into account any edge
function scaledOutcome(hash, vxSignature) {
  const nBits = 52 // number of most significant bits to use

  // 1. HMAC_SHA256(key=vxSignature, message=hash)
  const hmac = crypto.createHmac("sha256", vxSignature)
  hmac.update(hash)
  seed = hmac.digest("hex")

  // 2. r = 52 most significant bits
  seed = seed.slice(0, nBits/4)
  const r = parseInt(seed, 16)

  // 3. X = r / 2^52
  return r / Math.pow(2, nBits) // uniformly distributed in [0; 1)
}

To compute the hash chain and verify game results, you can use this open-source tool.

The technical details of our game result generation scheme can be found in our maths page.

Topic: MoneyPot.com - Seeding event (Read 56 times)