The present invention is a Weight Verification Device (WVD) that stamps a weight transaction record with a digital signature so that transaction data may be verified at a later time. The WVD is an Application Specific Integrated Circuit (ASIC) device that is installed in a sealed digital weight indicator....http://www.google.co.uk/patents/US6237098?utm_source=gb-gplus-sharePatent US6237098 - System for protecting weight verification device private key
