  In this paper we discuss existing approaches for Bitcoin payments, as
suitable for a small business for small-value transactions. We develop an
evaluation framework utilizing security, usability, deployability criteria,,
examine several existing systems, tools. Following a requirements engineering
approach, we designed, implemented a new Point of Sale (PoS) system that
satisfies an optimal set of criteria within our evaluation framework. Our open
source system, Aunja PoS, has been deployed in a real world cafe since October
2014.
