OKB Token Smart Contract Audit

Summary

This Solidity contract seems to be an implementation of a token contract for OKB (the cryptocurrency of OKEx exchange) with functionalities like transferring tokens, pausing/unpausing transfers, approving transfers, managing allowances, freezing/unfreezing addresses, and adjusting token supply. Here’s a breakdown of the key components and functionalities: SafeMath Library: This library is used for arithmetic operations to prevent overflows and underflows. Contract Variables: balances: Mapping to store the balance of each address. totalSupply: Total supply of the token. name, symbol, decimals: Metadata of the token. _allowed: Mapping to track allowances for each address. owner: Address of the contract owner. paused: Boolean flag to control whether transfers are paused or not. lawEnforcementRole: Address with special permissions. frozen: Mapping to track frozen addresses. supplyController: Address controlling token supply. Events: Events are used to log significant contract actions. Modifiers: onlyOwner: Restricts functions to be called only by the contract owner. whenNotPaused: Restricts functions to be called only when transfers are not paused. onlyLawEnforcementRole: Restricts functions to be called only by the law enforcement role. onlySupplyController: Restricts functions to be called only by the supply controller. Functions: initialize(): Initializes the contract. totalSupply(), balanceOf(), allowance(): Getters for total supply, balance of an address, and allowance of spender. transfer(), transferFrom(): Transfers tokens from one address to another. approve(), increaseAllowance(), decreaseAllowance(): Approves spender to spend tokens on behalf of the owner. pause(), unpause(): Pauses/unpauses transfers. setLawEnforcementRole(), wipeFrozenAddress(), freeze(), unfreeze(): Manage frozen addresses by the law enforcement role. setSupplyController(), increaseSupply(), decreaseSupply(): Manage token supply. The OKBImplementation contract is a Pausable ERC20 token with Burn and Mint controlled by a central supply controller. This contract also includes external methods for setting a new implementation contract for the proxy. OKB Token smart contracts offer various functions like pause/unpause contracts and freeze/unfreeze address balances for transferring. Overall, this contract provides functionalities for managing a token ecosystem including ownership, transfers, allowances, freezing addresses, and controlling token supply, with certain permissions delegated to specific roles.