On the Origins and Variations of Blockchain Technologies
It provides a historical analysis for researchers and practitioners to understand blockchain variations, but is incremental in nature.
The paper traces the origins of blockchain technologies to identify enduring needs and key elements, highlighting David Chaum's 1979 vault system as an early embodiment.
We explore the origins of blockchain technologies to better understand the enduring needs they address. We identify the five key elements of a blockchain, show embodiments of these elements, and examine how these elements come together to yield important properties in selected systems. To facilitate comparing the many variations of blockchains, we also describe the four crucial roles of blockchain participants common to all blockchains. Our historical exploration highlights the 1979 work of David Chaum whose vault system embodies many of the elements of blockchains.