Each network is based on Hyperledger Indy and each is made up of between 4 and 25 nodes which are operated by Sovrin Stewards. BuilderNet is only for internal use by Sovrin Foundation.
The Sovrin Foundation acts as a Governance Authority and operates the network as a whole, monitoring and improving performance in support of its ‘Identity for All’ mission.
*In full recognition of its Identity for All mission and to facilitate SSI adoption in hardship domains, upon a well-grounded request the Sovrin Foundation will consider a special 90% discount for a MainNet Endorser DID for an initial phase in individual cases, for e.g. volunteer-driven low-funded non-profits, educational organizations and global south start-ups.