  Known as a distributed ledger technology (DLT), blockchain has attracted much
attention due to its properties such as decentralization, security,
immutability and transparency, and its potential of servicing as an
infrastructure for various applications. Blockchain can empower wireless
networks with identity management, data integrity, access control, and
high-level security. However, previous studies on blockchain-enabled wireless
networks mostly focus on proposing architectures or building systems with
popular blockchain protocols. Nevertheless, such existing protocols have
obvious shortcomings when adopted in wireless networks where nodes may have
limited physical resources, may fall short of well-established reliable
channels, or may suffer from variable bandwidths impacted by environments or
jamming attacks. In this paper, we propose a novel consensus protocol named
Proof-of-Channel (PoC) leveraging the natural properties of wireless
communications, and develop a permissioned BLOWN protocol (BLOckchain protocol
for Wireless Networks) for single-hop wireless networks under an adversarial
SINR model. We formalize BLOWN with the universal composition framework and
prove its security properties, namely persistence and liveness, as well as its
strengths in countering against adversarial jamming, double-spending, and Sybil
attacks, which are also demonstrated by extensive simulation studies.
