BNB (BNB)

What BNB is

BNB is the native coin of BNB Chain, the blockchain network associated with Binance. It pays transaction fees on the network, it is the asset staked to secure it, and it is used to vote in on-chain governance (source: BNB Chain documentation). The main execution environment is BNB Smart Chain, which runs Ethereum-compatible smart contract code, so most tooling written for Ethereum works on it with little modification.

BNB is therefore closer to a gas asset than to a pure exchange token. Fees on BNB Smart Chain are paid in BNB, validators are paid in BNB, and applications deployed there price their operations in it.

For where to buy BNB in your country or state, see the availability tables on this page alongside the venue list at Exchanges.

How it works

BNB Smart Chain uses a consensus design its whitepaper calls Proof of Staked Authority, or PoSA, which the document describes as combining delegated proof of stake with proof of authority. Rather than open block production to anyone with hardware, the network elects a working set of validators and rotates block production among them.

The whitepaper sets out three validator roles, recalculated every 24 hours. The Cabinet is the top 21 validators by stake and produces blocks. The Candidate tier sits below it with limited block production opportunities. The remainder are Inactive. Entry is permissionless in principle: "any organization or individual can become part of the validator set by creating their validator on-chain and securing sufficient delegations" (source: BNB Chain whitepaper). Holders who do not run a validator can delegate stake to one.

Speed was the original design goal. The whitepaper set a target of block times "shorter than the Ethereum network, e.g., 3 seconds" with finality around 10 seconds. Successive hard forks pushed that much further. BNB Chain's documentation states that block time is now approximately 0.45 seconds, with a standard gas price of 0.05 Gwei producing typical transaction costs "around $0.005 or less" (source: BNB Chain documentation).

Because the chain is Ethereum-compatible, the same categories of application appear on it. BNB Chain's documentation reported over 1,500 decentralized applications and defi protocols with tvl exceeding $20 billion as of May 2024.

Supply and tokenomics

BNB has a deflationary mechanism written into block production. The whitepaper states that "a fixed ratio of the gas fee collected by the validators will be burned in each block," and that "the burning ratio can be governed by the BSC validators." Every transaction on the chain therefore destroys some BNB, and the rate at which it does so is a governance parameter rather than a constant.

That is worth separating from how new BNB is distributed. There is no mining subsidy paid to block producers in the way a proof of work chain issues new coins. Validators and delegators earn from staking, and reward rates depend on how much is staked, on validator performance, and on the commission each validator sets, so a figure from one period is not a forecast for another.

The three documented uses of BNB, per BNB Chain's own overview, are paying transaction fees, staking, and participating in governance as a token holder. Governance covers protocol parameters, including the burn ratio itself.

Anyone modeling BNB supply should check the current burn parameters and the total burned to date on BNB Chain's own publications rather than relying on figures repeated by third parties, since the parameters are adjustable by validator governance.

History

BNB Chain began as two chains rather than one. The whitepaper describes the original arrangement: BNB Beacon Chain handled staking and validator governance, while BNB Smart Chain provided the smart contract environment, with the two running in parallel and assets moving between them.

That split was retired. In November 2023 the project published BNB Chain Fusion as BEP-333, which set out the sunset of the Beacon Chain and merged its functions into BNB Smart Chain (source: BNB Chain whitepaper). The result is a single chain that carries staking, governance, and contract execution together.

BNB Smart Chain's role has since widened beyond being an execution layer in its own right. The whitepaper describes it as the settlement layer for layer 2 networks including opBNB, and as the smart contract platform for Greenfield, the project's decentralized storage network. Performance work continued in parallel through a series of hard forks that reduced block time from the original three-second target to roughly 0.45 seconds.

The consistent thread across that history is that BNB Chain optimizes for throughput and low fees, accepting a smaller and more structured validator set than chains that prioritize permissionless block production.

Risks and what to watch

Validator concentration is the structural issue. A working set of 21 block producers is small by design, and it is the trade-off that buys sub-second blocks. It also means the set of parties who could coordinate to censor transactions or push a parameter change is small enough to enumerate. Watch how stake is distributed across that set and how frequently membership actually rotates.

Governance risk follows from the same design. The gas fee burn ratio, and other network parameters, are set by validator governance rather than fixed in the protocol. A tokenomics assumption based on today's parameters is only as durable as the governance process that can change them.

BNB's association with Binance is a factor a holder should understand rather than ignore. Regulatory action affecting the exchange, or changes in which jurisdictions it serves, can affect where BNB itself is available to buy and sell, even though the chain runs independently of any single venue. RampAtlas tracks that availability by jurisdiction because it changes more often than the technology does.

On the application side, the risks are the ordinary ones of an Ethereum-compatible chain: contract bugs, malicious token approvals, and outright rug pull projects. Low fees make it cheap to deploy honest applications and equally cheap to deploy dishonest ones.

Frequently asked questions

What is BNB used for?

Three things, according to BNB Chain's documentation: paying transaction fees on the network, staking to secure it and earn rewards, and voting in governance as a token holder. It is the gas asset for BNB Smart Chain, so any interaction with a contract there requires holding some.

What consensus does BNB Smart Chain use?

Proof of Staked Authority, described in the BNB Chain whitepaper as a combination of delegated proof of stake and proof of authority. The top 21 validators by stake form the Cabinet and produce blocks, with the validator set recalculated every 24 hours.

Is BNB burned?

Yes. The BNB Chain whitepaper states that a fixed ratio of the gas fee collected by validators is burned in each block, and that the ratio "can be governed by the BSC validators." Check BNB Chain's current publications for the parameter in force and the cumulative amount burned.

How fast and how cheap are BNB Smart Chain transactions?

BNB Chain's documentation gives a block time of approximately 0.45 seconds and a standard gas price of 0.05 Gwei, putting typical transaction costs "around $0.005 or less." Those figures date from the documentation's most recent revision rather than being fixed guarantees.

Where can you buy BNB?

Availability depends on your country or US state, and it is affected by which venues operate there. See where to buy BNB for the exchanges that serve your jurisdiction, and Exchanges to compare fees and access requirements.