SONM uses a dedicated blockchain for internal decentralized algorithms. SONM blockchain is much faster than Ethereum as it issues a block each 2-3 seconds. Moreover, it has no payments for gas, incentivising micropayments and small resource allocation contracts.
SONM blockchain is based on Ethereum technologies. Technically speaking it is a separate Ethereum network with unique genesis block and patched mining nodes that enable custom DDoS protection. Decentralised components of SONM are hist on SONM blockchain as Ethereum smartcontracts. For example, Market is a smartcontract that is responsible for order processing, deal processing and payments.
To convert SONM tokens between SONM blockchain and Ethereum the Gate is used.