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PopCoin: A Bitcoin Offline Payment Mobile Wallet App. The problem for bitcoin mobile payment is people need to make the payment online, and need to know payee's bitcoin address by scan QR code or input manually. With PopCoin, payer don't even need to know payee's bitcoin address. Simply make the payment via sound transimission, which is totally offline and zero transaction fee. PopCoin also integrate Touch ID to confrim the payment on iPhone devices like Apple Pay. PopCoin based on web online wallet back-end (we named it WageCan) via blockchain.info API. PopCoin make bitcoin payment without the hassle, we reinvent bitcoin mobile wallet. People should pay in bitcoin as easy as paying fiat currency.