  The concept of shared ledger systems offering a single source of truth has
repeatedly called traditional bookkeeping into question. Improving upon the
long-standing double-entry system, solutions such as the Resource-Event-Agent
(REA) accounting framework, triple-entry accounting (TEA) and blockchain have
been advanced. However, to date, the historical development of these concepts
remains murky. This paper conducts a genealogical analysis of shared ledger
systems, in particular tracing the development of REA, TEA and blockchain. We
show how the REA framework has had a distinct influence on independent streams
of research in the field of TEA, and how this interaction may be traced to the
present incarnation of shared ledger systems in blockchain. In doing so, we
duly acknowledge the influence of key individuals contributing to this
development, correct common misconceptions and map out how the paths of REA,
TEA and blockchain overlap in the realm of shared ledger systems.
