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Helium is a decentralized, open wireless network built on a new blockchain for the physical world. It relies on a novel type of work called Proof of Coverage, and a new consensus algorithm (based on HoneyBadger BFT). The Helium Network is used to route data for long-range, lower power IoT devices that use Helium’s LongFi protocol

History

Helium was founded in 2013 by Shawn Fanning, Amir Haleem, and Sean Carey, with a mission to make it easier to build connected devices. Helium believes that today’s wireless connectivity options are wholely inadequate for the next generation of machines. To solve this they developed the Helium Hotspot, a combination of a physical blockchain node and wireless gateway that network participants can deploy to receive compensation in HNT, the native token. In order to receive rewards, Hotspots must submit proof of wireless coverage in a cryptographically verified location and time. Once the network is deployed, any sensor using the Helium LongFi wireless protocol can connect to the network which is intended for battery-powered devices sending small amounts of data over miles of range. Hotspots are rewarded in HNT based on the quality of the coverage they provide and the amount of LongFi sensor data they transport for devices on the network. HNT is burned to create Data Credits, a non-fungible token used for all transaction fees on the network. Data Credits are required for things like sending sensor data and asserting Hotspot location. Any LongFi-enabled IoT device can send data through any Helium Hotspot that’s providing coverage.

Technology

Helium relies on a Proof-of-Coverage where Hotspots assert their location according to their GPS coordinates, and other Helium Hotspots routinely challenge in order to prove their location. Knowing where, when and how strongly a signal was received allows for verification of the transmitter location. Hotspots are constantly challenged by the Helium blockchain to prove their coverage, and they carry a score that floats dynamically between 0.0 and 1. This score represents the Network’s confidence in their location as derived from those challenges, and thus the quality of their Helium LongFi wireless coverage Consensus is reached using the Helium Consensus Protocol. It works by having the best proofs of coverage from the prior epoch elect members for the next one who then runs a distributed key generator to bootstrap their threshold encryption keys. Each member accepts transactions until they have a certain amount in their queue, then encrypts them with the threshold public key and gossips encrypted data around. Once members all share their proposed transactions, they are all threshold decrypted at which point they cannot be censored. The transactions are deduplicated, invalid ones removed, and they are combined into a new block. This block then has a threshold signature applied to it. Members trying to censor transactions will end up with a different block than honest nodes and thus their signature shares won’t be valid. Helium provides coverage using LongFi, an open-source protocol in the Sub-GHz frequency band. Using LongFi any device can broadcast a message within the coverage area of the Helium network and have their message relayed to a web server for a fee.