Primecoin is a cryptocurrency based on finding prime numbers. Identifying prime numbers plays a central role in cryptography. Primecoin's unique Proof-of-Work (PoW) consensus mechanism is able to increase transaction speeds and improve energy efficiency.
The network searches for special prime number chains known as Cunningham chains and bi-twin chains, which are of interest in mathematical research.

MOL is developing a blockchain platform for micro-payments. MOL's architecture will be based on the block lattice design used in Nano, and will have a Delegated Proof-of-Stake (dPoS) consensus mechanism that incorporates elements from Directed Acyclic Graphs (DAG). The MOL network is currently powered by the Ethereum-based MOL token.