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Smart Contract Contract Address Date Deployed Block Number Original Author(s)
Ethereum 0x031eaE8a8105217ab64359D4361022d0947f4572 20 January 2019 7097983 Scheich R. Ahmed
ThunderCore 0xA9EfBB7c3FE6410eB3edae1B97205209Cd41bA09 13 June 2019 9195098 Scheich R. Ahmed

A Guide for using the Ñíguez Randomity Engine

On-Chain Usage

  • Import Ethereum API into your project | Use the following in Remix IDE (Other platforms may not support GitHub)

    pragma solidity ^0.5.0;

import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";

  • Import ThunderCore API into your project | Use the following in Remix IDE (Other platforms may not support GitHub)

    pragma solidity ^0.5.0;

import "https://github.com/niguezrandomityengine/thundercoreAPI/nreAPI.sol";

  • Create a Smart Contract as follow:

    pragma solidity ^0.5.0;

import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";

contract Randomness is usingNRE {

}

  • Code function to use sequences and set slots, there are 24 sequences i.e ra(), rb(), rc() upto rx().

    Example 1: Using the explicit sequence to get a 10 digits random number.

    pragma solidity ^0.5.0;

import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";

contract Randomness is usingNRE {

   function randomNumber() public view returns (uint256){
       return (ra()%(10**10));
   }
 
}

    Example 2: Using multiple sequences to generate 3 digits random number ranging from 0 to 999.

    This type of random number generation can be used to randomly select validators in a Proof of Stake (PoS) network.

    pragma solidity ^0.5.0;

import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";

contract Randomness is usingNRE {

   function randomNumber() public view returns (uint256){
       return (((rf()%10)*100)+((rx()%10)*10)+(rm()%10));
   }
 
}

    Example 3: Transaction of random numbers into state or local variable.

    The below transaction will consume gas, approximately (40k - 120k) gas per sequence.

    pragma solidity ^0.5.0;

import import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";

contract Randomness is usingNRE {

uint256 public randomNumber;

event rNum(uint256 theNumber);

       /**State Variable. */
   function stateRandomNumber() public {
       randomNumber = (((ru()%10)*100)+((re()%10)*10)+(rq()%10));
   }
  
       /**Local Variable. */
   function localRandomNumber() public {
       uint256 randomGame = (((rj()%10)*100)+((rg()%10)*10)+(ri()%10));
       emit rNum(randomGame);
   }

}

    Example 4: Using the slot of numbers from between the sequence and hashing it for distinct random sequence

    pragma solidity ^0.5.0;

import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";

contract Randomness is usingNRE {

   function randomNumber() public view returns (uint256){
       return (uint256(keccak256((rw()/(10**20))%(10**12))));
   }
 
}

  • These are merely 4 instances of generating a pseudo-random number, the user could use this numbers in infinite possibilities by using dynamic slot selections, cross stitching sequences and using them as a salt to hash with user's address or nonce.

Off-Chain Usage

  • For off-chain application use web3.js library, Javascript and the contract (application binary interface) ABI.
  • Contract | ABI

Conclusion