Abstract: This invention discloses a system for safe collection of payment in return for goods, values or services, the system including a multiplicity of electronic system elements wherein each individual one of the elements has a purse storing an amount of credit for value receivable granted to the individual system element, each purse including a purse monitor operative to sign and authenticate a transaction record of each transaction in which the purse uses some of the credit for value receivable which it has been granted, and a purse control unit operative to prevent the purse, off-line, from exceeding the credit for value receivable which it has been granted.

Abstract: A system for safe collection of payment by a vehicle operator from riders, the system including a multiplicity of electronic payment receipt generators, each operable by a vehicle operator, wherein each individual one of the payment receipt generators includes an electronic purse storing an amount of electronic cash, each electronic purse including an electronic cash loader operative to use some of the electronic cash to generate a payment receipt to be given by the vehicle operator to a rider, and an electronic purse control unit operative to prevent said electronic cash loader from exceeding said amount of electronic cash, thereby limiting the vehicle operator's entitlement to collect payments from riders, and an electronic cashier purse operative to increment the electronic purse of each electronic payment receipt generator by the amount of payment collected by the vehicle operator to whom the electronic payment receipt generator is assigned.