Patent ID: 8924309

Claim:
A computer server system for providing assured transactions, the system comprising: a server device comprising: a memory store storing a plurality of watermarks, the watermarks being unrelated to any specific transaction; and one or more processors; one or more non-transitory computer readable media storing computer executable instructions which, when executed by the one or more processors, cause the one or more processors to perform operations comprising: establishing, by the server device, a first communication path between a first user device and the server device via a network, receiving, by the server device, from the first user device via the network transaction data relating to a transaction for a known user, selecting, by the server device, a watermark from the memory store storing the plurality of watermarks, wherein the watermarks are unrelated to any specific transaction, including, by the server device, the selected watermark in first verification data comprising first data for verification and relating to the transaction and watermark data relating to the watermark for preventing tampering with the first data, transmitting, by the server device, to the first user device the first verification data via the first communication path, establishing, by the server device, a second communication path between a second user device and the server device via a network, the second user device associated with the known user, and transmitting, by the server device, to the second user device second verification data providing an indication of the selected watermark via the second communication path, wherein the second verification data comprises an index, wherein a processor of the second user device is configured for: retrieving indication data of the selected watermark from a memory storing a plurality of indication data of watermarks based on the index, and providing to the user the indication data; and receiving, by the server device, transaction verification data from the first user device; and a transmitter configured for transmitting the first verification data to the first user device and for transmitting the second verification data to the second user device.