Seed - Audit

In the contract `Ownable` the role `_owner` has authority over the functions shown in the diagram below. Any compromise to the `_owner` account may allow the hacker to take advantage of this authority and do the following: - `renounceOwnership()`, maliciously give up the ownership. - `transferOwnership()`, maliciously transfer ownership to any account.  In the contract `SEED` the role `_owner` has authority over the functions shown in the diagram below. Any compromise to the `_owner` account may allow the hacker to take advantage of this authority and do the following: - `freezeAccount()`, maliciously protect any valid address from transferring assets. - `thawedAccount()`, maliciously allow any invalid address to transfer assets. 

The change of `_owner` by function `transferOwnership()` overrides the previously set `_owner` with the new one without guaranteeing the new `_owner` is able to actuate transactions on-chain.

According to the code logic of `_beforeTokenTransfer()` function, we know that the frozen accounts just cannot transfer token, but they can still receive token from others. ```solidity=658 function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override(ERC20) { require(!frozenAccounts[from], "Frozen Account Can not Transfer Token,Please Contact the Support Team!"); super._beforeTokenTransfer(from, to, amount); } ```