ONFA - Audit

In the contract `ONFA_NFT` the role `DEFAULT_ADMIN_ROLE` has authority over the following functions: - grantRole - revokeRole Any compromise to the `DEFAULT_ADMIN_ROLE` account may allow the hacker to take advantage of this authority and grant/revoke minter and pauser roles. In the contract `ONFA_NFT` the role `MINTER_ROLE` has authority over the functions shown in the diagram below. Any compromise to the `MINTER_ROLE` account may allow the hacker to take advantage of this authority and mint NFTs.  In the contract `ONFA_NFT` the role `PAUSER_ROLE` has authority over the functions shown in the diagram below. Any compromise to the `PAUSER_ROLE` account may allow the hacker to take advantage of this authority and pause/unpause the contract.  ----- In the contract `TetherUSD` 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 mint tokens, transfer/renounce ownership.   ----- In the contract `VNDT` 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 transfer/renounce the ownership and mint tokens.