A set top box (STB) includes a trusted transactional cache and associated transactional protocol and enables e-commerce transactions to be securely committed to a remote server extremely quickly and with little network overhead. The invention does away with the user concern of whether the transaction was successful. The STB operates equally well on robust private networks as on unpredictable Internet or wireless networks, and avoids upsetting users who would otherwise have to wait in front of a display screen for confirmation of completion of the transaction after a temporary communication failure with the central site. The method may advantageously be used to provide cost-effective micro-payments solutions. The STB may include a dual headed display capability in which data and video maybe be directed to separate displays. The STB may feature an embedded ticket printer, as well as an embedded barcode scanner. This enables non computer literate users to more conveniently track transactions committed via the STB, or to take advantage of promotional coupons. The STB features an embedded hardware true Random Number Generator to produce maximum entropy encryption keys, therefore providing maximum secure and fool-proof means to protect private data using government authorized encryption schemes.