The format of the contract account address is the same as that of external accounts: hex or Base58. By way of example, Vanity-BTC can't and won't ever store your private essential, and if you don't have faith in it, you may have three means to guarantee your crucial remains private: https://tron96295.daneblogger.com/31064010/the-smart-trick-of-random-trx-address-that-no-one-is-discussing