NexusBFT
NexusBFT is the consensus mechanism of the Nexus blockchain, built on CometBFT.
Single-slot finality
Blocks are final when committed. There is no probabilistic finality window. Once >2/3 of validators precommit a block, it is irreversible.
Consensus rounds
Propose — A designated proposer assembles a block and broadcasts it
Prevote — Validators evaluate the block and broadcast a prevote (for the block or nil)
Precommit — Once >2/3 prevotes are seen for the same block, validators broadcast a precommit
Commit — Once >2/3 precommits are seen, the block is committed and final
If a round fails, the protocol advances to a new round with a new proposer. The system never forks.
Validators
Validators run a Cosmos consensus node (nexus-cosmos) and an EVM execution node (nexus-evm).
Responsibilities:
Participate in every consensus round
Maintain high uptime
Run both consensus and execution nodes
The validator set is permissioned at launch and will expand over time. Validators will stake $NEX to join the active set in subsequent upgrades.
Role in the system
NexusBFT orders transactions and commits blocks with finality. Today it commits NexusEVM blocks. When NexusCore launches (H2 2026), NexusBFT will also commit exchange execution blocks at a faster cadence.
After a block is committed, the Compute Network will generate a validity proof of the execution batch. NexusBFT provides ordering and finality; the Compute Network will provide verifiability.
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