The Voatz blockchain is built using the Hyperledger Fabric framework, originally pioneered by IBM and now run by the Linux Foundation. This framework is a public-permissioned network, meaning the network is visible to the public, but in order to participate as a verifying node, the verifier must pass through a strict vetting process. This allows the network to limit verifying participants to the geographical boundaries of the jurisdiction, and to broaden stakeholdership to include all relevant election observers and stakeholders. In the Voatz network, the minimum number of validating nodes is four, and these can be expanded to 16 or 32 as needed, depending on the estimated number of voters. Additional scaling is planned for the future.
It is important to note that this type of blockchain network is distinctly different from the public blockchain network used by many cryptocurrencies, like Bitcoin, where anyone can sign up to participate as a verifying node.