The famous new money Bitcoin is classified as a technical informational money (TIM). Besides introducing the idea of a TIM,
a more extreme notion of informational money will be developed: exclusively informational money (EXIM).
coins (INCOs) of an EXIM can be in control of an agent but are not owned by any agent. INCOs of an EXIM cannot be stolen,
but they can be lost, or thrown away. The difference between an EXIM and a TIM shows up when considering a user perspective
on security matters. Security for an EXIM user is discussed in substantial detail, with the remarkable conclusion that computer
security (security models, access control, user names, passwords, firewalls etc.) is not always essential for an EXIM, while
the application of cryptography based information security is unavoidable for the use of an EXIM.
Bitcoin seems to meet
the criteria of an EXIM, but the assertion that "Bitcoin is an EXIM", might also be considered problematic. As a thought experiment
we will contemplate Bitguilder, a hypothetical copy of Bitcoin that qualifies as an EXIM.
A business ethics assessment
of Bitcoin is made which reveals a number of worries. By combining Bitguilder with a so-called technical informational near-money
(TINM) a dual money system, having two units with a fluctuating rate, may be obtained. It seems that a dual money can remedy
some, but not all, of the ethical worries that arise when contemplating Bitcoin after hypothetically having become a dominant
form of money.
The contributions that Bitcoin's designers can potentially make to the evolution of EXIMs and TIMs is analyzed
in terms of the update of the portfolio of money related natural kinds that comes with Bitcoin.