  Blockchain technology constitutes a paradigm shift in the way we conceive
distributed architectures. A Blockchain system lets us build platforms where
data are immutable and tamper-proof, with some constraints on the throughput
and the amount of memory required to store the ledger. This paper aims to solve
the issue of memory and performance requirements developing a multiple
Blockchain architecture that mixes the benefits deriving from a public and a
private Blockchain. This kind of approach enables small sensors - with memory
and performance constraints - to join the network without worrying about the
amount of data to store. The development is proposed following a context-aware
approach, to make the architecture scalable and easy to use in different
scenarios.
