Quote from: bitcarra on Today at 02:00:57 AM

https://i.imgur.com/vmVq4zc.png

To establish transparency, Bitcarra is using the provably fair concept to eliminate external intervention in the results of all the games that we are providing on the platform. Since the blockchain is immutable, players will also be able to verify all the historical game multipliers through a public algorithm.

The current date and time as of this posting are 28/08/2021 10:00 (GMT +8), and the current Bitcoin block is 697905. For the salt, we will commit to using the lowercase, the hexadecimal string representation of the hash from block 697929, which will only be mined approximately 4 hours away (i.e. mining rate of 10 min/block) in the future. Since the future blocks have not been mined, we would not have been able to deliberately select a block with a hash that could be favorable to us. The 17 initial salts will be based on the subsequent blocks, each sampled three blocks apart. For example, the first block in consideration is 697929, the subsequent block for the following game will be 697932, and so on.

For every game, we have pre-generated a chain of 5,000,000 SHA-256 hashes. Each element is the hash of the lowercase, hexadecimal string representation of the previous hash. Their respective terminating hashes are presented below:

No	Bitcarra Games	Terminating Hash
1	Dual Crash Game D1	21732a6b15e3927a10403e234b60ebe90305cd42869b67fe42787c13e4166a59
2	Dual Crash Game D2	7d70a68836a897db950d3c9a09598b22999661d028b6757495a96713b565472f
3	Dual Crash Game D3	4cada73e2bd7851c4fa68702e57984b0af306cbc904e319f2502caaa78193f3b
4	Dual Crash Game D4	e15139141a2f3fb6090d68cfd92fc88459b6c3efd5f7db838f5588f8ab299604
5	Dual Crash Game D5	e40379973d02b968d11c2657ba70694c22e084f15f34d06883215f04a5b29afb
6	Dual Crash Game D6	62f47c8170b34037d1c5ffe5423a523c75338162033d1d44de2316b2c3fa729c
7	Dual Crash Game D7	591511fac4dcb0ababe7bae25bf60fb3505a4774ae8760edfce06d8020d6dc4d
8	Dual Crash Game D8	0704f8635d94ea2154159498c012640685e02be9ddd2101ea42fd6d7bc99c17e
9	Dual Crash Game D9	53f11ae4ac147f2e486626548bc65e124bc267a0fb3a6c0e9e21c325314146b8/td]
10	Dual Crash Game D10	953a848d472a72a992b2a5cb2acd1df051953aaef85bfdf291a0978c16caa679
11	Dual Crash Game D11	2327b17f74a435176478acf9116ce32af9aca11c6b5be870fd090d4dce1e98be
12	Dual Crash Game D12	1667e180280d95abc3f57f574bb1942571da60f78912d9fe61785bba5a886f48
13	Single Crash Game S1	4cda5e6d1237af68cca28f38f4ab744dd1d6439b2e3d16a7c5b03ff676592092
14	Single Crash Game S2	cdd2e03da8fe4fda82d1e95dfb1f88d606aa7f42b5332cc7eeb18f17af116ff0
15	Single Crash Game S3	636b9b7bbbfe000820db4c497bd8ff8a18f9e5e62dfd68c6958bc0a1a13ad826
16	Single Crash Game S4	ffc97f599db4b04f29d1ed588969aceb771d30bf5c7ed04fdfd85e253adf23b5
17	Classic Crash Game C1	614546bdbe297a0c838559efd65dec9a2b6af73cb99a5ba5cd58067a07ab1de0

To get the results of the games, these are our implementations of how we use the hashes.

Implementation of the Single Crash Game is as follows:

export function getMultiplier(seed, salt, offset = 2.5) {
   const nBits = 52;

   const hmac = HmacSHA256(seed, salt);
   seed = hmac.toString(enchex);

   seed = seed.slice(0, nBits / 4);
   const r = parseInt(seed, 16);

   let X = r / Math.pow(2, nBits);

   X = (100 - offset) / (1 - X);

   const result = Math.floor(X);
   return Math.max(1, result / 100);
};

Implementation of the Dual Crash Game is as follows:

export function getDual(seed, salt) {
const nBits = 40; // number of most bits to use per number
const nChars = nBits / 4; // number of hex characters per number
const hmac = CryptoJS.HmacSHA256(seed, salt);

seed = hmac.toString(CryptoJS.enc.Hex);

// Extract 6 slices from the hash
const hexNumbers = [];
for (let i = 0; i < 6; i++) {
   const number = seed.slice(i * nChars, nChars * (i + 1));
   hexNumbers.push(number);
}

// Convert 6 slices to a number between 0-9
return hexNumbers
   .map(n => parseInt(n, 16) * 10)
   .map(n => n / Math.pow(2, nBits))
   .map(Math.floor);
};

Implementation of the Classic Crash Game is as follows:

export function getClassic(seed, salt, offset = 1) {
   const nBits = 52;

   const hmac = HmacSHA256(seed, salt);
   seed = hmac.toString(enchex);

   seed = seed.slice(0, nBits / 4);
   const r = parseInt(seed, 16);

   let X = r / Math.pow(2, nBits);

   X = (100 - offset) / (1 - X);

   const result = Math.floor(X);
   return Math.max(1, result / 100);
};

For more information about the Bitcoin block being mined, you can also log on to https://www.blockchain.com/btc/blocks