audit091922.js

{
  contract: 'Gotchi',
  summary: 'This contract is an ERC1155 token contract for the game Gotchi. It allows users to mint and manage their own Gotchi pets. The contract includes functions for feeding, playing, and sleeping with the Gotchi pets. The contract also keeps track of the hunger, boredom, and energy levels of the pets.',
  findings: [
    {
      type: 'Reentrancy',
      description: 'The contract uses the ReentrancyGuard library to prevent reentrancy attacks.',
      recommendation: 'No action needed.',
      severity: 'Low'
    },
    {
      type: 'Arithmetic Overflow',
      description: 'The functions `calcHungerSince`, `calcBoredomSince`, and `calcEnergySince` use integer arithmetic, which can result in arithmetic overflow if the values become too large.',
      recommendation: 'Consider using safe math libraries or checks to prevent arithmetic overflow.',
      severity: 'Medium'
    },
    {
      type: 'Insecure Randomness',
      description: 'The function `createGotchi` generates a random DNA number using `keccak256(block.difficulty, count)`, which is not a secure way to generate random numbers.',
      recommendation: 'Consider using a more secure method for generating random numbers, such as using an oracle or an external source of randomness.',
      severity: 'High'
    },
    {
      type: 'Access Control',
      description: 'The function `createGotchi` does not have an access control modifier, allowing anyone to call the function and create a new Gotchi.',
      recommendation: 'Consider adding an access control modifier, such as `onlyOwner`, to restrict the ability to create new Gotchis.',
      severity: 'Medium'
    },
    {
      type: 'Unprotected Ether Transfer',
      description: 'The function `mint` transfers ether to the contract without any checks or restrictions.',
      recommendation: 'Add checks and restrictions to ensure that only the intended users can transfer ether to the contract.',
      severity: 'Medium'
    }
  ]
}