In TAUcoin, mobile mining is defined as a hashing process on combined blockchain history and miner public key associated with transactions recorded on chain. It shares the same nature in bitcoin hashing, but mining power is generated from the transaction history rather than chips hashing strength or staking coins. This is a new consensus in exploration and still early to see its full potential. However, the experimental facts collected so far proves that it consumes insignificant computation and bandwidth. Proof of transaction(POT) mobile mining according the white paper is able to establish internal transaction market for all participants by including three types of block rewards. The needs of mobile mining derive from the lack of infrastructure in most part of the developing world and urgent needs of un-banked population. This is the "first contact" for those population to feel permission-less banking and trust-less verification experience at the same time through POT crypto currency.