Both YottaMark and FoodLogiq offer systems that let shoppers typea text code intoa mobile phone or home computer, or scan a bar-code using a phone's built-in camera, to find out when the tomatoes on the shelf were picked and which field they came from.
The second aspect of the Singularity that Stross takes a look at in his anti-Singularity arguments is the prospect of uploading the brain intoacomputer, which is a popular means in speculative fiction for atype of immortality.
Every time you sign a transaction, you type in sequences of digits from the computer screen into the device, and then copy other sequences of digits displayed by the device back into the computer.