Metal is a digital asset storage payment wallet, which distributes tokens through "processing proof of payment" (Popp). Verified payment (Popp) is a verifiable way to identify users and allocate new currencies to the system. When users use wallets to transfer, pay and remit money, they will receive certain tokens. In addition, users who convert legal tender into cryptocurrency will be rewarded. Metal's system uses provable payments with additional authentication to allocate tokens. Anyone can participate in earning metal token as a reward, or convert legal currency to cryptocurrency MTL. The metal project aims to provide all the financial services required by small and medium-sized enterprises (SMBs) as far as possible. MTL token is the local currency in the metal system, which is translated into Chinese. Metal is different from general digital currency wallets. General digital currency wallets consume tokens or miners' fees in the process of use. Metal not only does not consume handling fees, but also rewards users with a certain amount of metal. It is distributed by users through payment certificates (popps). Users receive MTL token rewards for every dollar spent by completing shopping payments or remittances. The maximum MTL quantity is 66.5 million. You can earn up to 5% MTL for each purchase. Users can get huge discounts by using MTL. MTL is easy to earn and makes consumption more interesting.