@inproceedings {260638, author = {Lei Tang}, title = {A Framework for Building an Electronic Currency System}, booktitle = {6th USENIX Security Symposium (USENIX Security 96)}, year = {1996}, address = {San Jose, CA}, url = {https://www.usenix.org/conference/6th-usenix-security-symposium/framework-building-electronic-currency-system}, publisher = {USENIX Association}, month = jul }