Question 1

How to set up a CometBFT node for a custom blockchain?

Accepted Answer

Start with the quick start guides for a single node or local cluster using docker-compose, then integrate your application via ABCI++. Documentation provides language-specific examples, but expect significant configuration effort.

Question 2

CometBFT vs Ethereum's consensus: which is better for my project?

Accepted Answer

CometBFT offers faster finality and higher TPS with BFT consensus, ideal for custom chains, while Ethereum uses proof-of-stake with a larger ecosystem but less customization. Choose based on need for speed versus network effects.

Question 3

What programming languages can I use with CometBFT for my app?

Accepted Answer

CometBFT is language-agnostic; you can write your state machine in any language (e.g., Python, Rust) and connect via ABCI++. However, the consensus engine itself is in Go, so node setup involves Go tools.

Question 4

Is CometBFT suitable for private or permissioned blockchains?

Accepted Answer

Yes, it works well for private networks where Byzantine fault tolerance is needed, but you'll need to configure validators and manage the consensus layer, which adds operational complexity.

Question 5

How does ABCI++ improve over the old ABCI?

Accepted Answer

ABCI++ extends programmability to all consensus phases (e.g., proposal, vote), allowing finer control and customization, whereas basic ABCI was more limited to application state transitions.

Question 6

What are the security considerations for running CometBFT?

Accepted Answer

Security relies on validator honesty and network configuration; vulnerabilities can be reported via Cosmos's bug bounty program. Ensure proper key management and monitor for Byzantine behavior in the network.

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