CoinYQ Dossier

BNB left Ethereum, survived its native-bridge exploit, and folded two chains into one

BNB began as the financing and fee token of a new exchange. Its move onto two native chains broadened that role, then a forged bridge proof created two million coins and forced the people behind the network to show how emergency power worked. The later Fusion and burn formulas are easier to understand as answers to those earlier design choices.

The token sale helped launch Binance

The 2017 Binance whitepaper, as quoted in the SEC complaint, set out 200 million ERC-20 BNB: 100 million for the public ICO, 80 million for the founding team and 20 million for angel investors. The first use was immediate—pay Binance trading fees and receive a discount under the exchange’s rules.

That arrangement joined token demand to a company product. Binance could revise a fee program without changing Ethereum, so BNB’s early utility depended on both a public ledger and private exchange policy.

One fee token acquired two native chains

BNB migrated from Ethereum to Binance Chain in April 2019. The new chain gave BNB a native role and prioritized a fast onchain order book, but it did not provide the general smart-contract environment developers wanted.

Binance Smart Chain launched beside it on 1 September 2020 with EVM execution, BNB transaction fees and staking. The 2022 BNB Chain name grouped the two networks; it was a rebrand, not another token swap.

A forged proof forced validators to reveal the emergency path

On 6–7 October 2022, an attacker forged low-level proofs in BSC Token Hub and withdrew 2 million newly created BNB. The bug sat in the native bridge between Beacon Chain and BSC rather than in an ordinary wallet transfer.

BNB Chain reported 26 active validators and 44 in total. Its team said it contacted community validators one by one, after which validators coordinated the BSC suspension and an upgrade. The response restricted further movement, but it also demonstrated that the network could be interrupted through rapid offchain coordination.

Fusion removed the bridge while two burn mechanisms remained

Staking, governance and asset functions moved into BSC, and Beacon Chain stopped at block 385,251,927 on 3 December 2024. Closing the older chain also removed the Token Hub route that had failed in 2022.

Supply reduction followed a separate transition. Auto-Burn replaced exchange-activity-based quarterly burns with a price-and-block formula, while BEP-95 destroys part of block gas fees. At 10:35 UTC on 15 July 2026, the 36th burn notice reported 1,615,827.795 BNB destroyed and total supply of 133,166,127.91.

The criminal pleas and the SEC dismissal answered different questions

On 21 November 2023, CZ pleaded guilty to causing Binance to violate the Bank Secrecy Act by failing to maintain an effective anti-money-laundering program. Binance separately pleaded guilty to Bank Secrecy Act, unlicensed money-transmission and sanctions violations and agreed to a $4.3 billion resolution. Those pleas concerned the exchange and its compliance conduct.

The SEC’s civil complaint separately alleged an unregistered BNB offering. On 29 May 2025 the parties jointly dismissed the action with prejudice as an exercise of SEC policy discretion. The dismissal ended that case but did not decide on the merits whether BNB was or was not a security. These outcomes belonged to the company and enforcement layer: they neither upgraded BNB consensus nor recorded a validator vote.

How the project changed

  1. 2017-07
    The ERC-20 allocation is offered

    The whitepaper divides 200 million BNB among the public ICO, founding team and angel investors.

  2. 2019-04
    BNB migrates to Binance Chain

    The exchange fee token becomes the native coin of an order-book-focused chain.

  3. 2020-09-01
    BSC adds EVM execution

    BNB becomes the gas and staking coin of the parallel smart-contract network.

  4. 2021-11
    BEP-95 starts fee burning

    BSC begins destroying a validator-adjustable share of each block’s gas fees.

  5. 2022-10-07
    Token Hub yields 2 million new BNB

    Forged bridge proofs lead the BNB Chain team to contact validators, who coordinate a suspension and upgrade.

  6. 2023-11-21
    Binance and CZ enter separate guilty pleas

    CZ admits the anti-money-laundering-program offense; Binance admits corporate BSA, money-transmission and sanctions offenses.

  7. 2024-12-03
    Beacon Chain stops

    The former staking and governance chain ends at block 385,251,927 after its functions move to BSC.

  8. 2025-05-29
    The SEC action is dismissed

    A joint dismissal with prejudice ends the case as a policy matter without a merits ruling on BNB.

  9. 2026-07-15
    The 36th burn is reported

    At 10:35 UTC, the notice reports 1,615,827.795 BNB destroyed and total supply of 133,166,127.91.

Evidence and primary sources

Last evidence review: 2026-09-05

What is BNB?

BNB is the native coin used to pay transaction fees and delegate stake on BNB Smart Chain. It began as an ERC-20 token tied to Binance exchange discounts in 2017, moved to Binance Chain in April 2019, and gained a smart-contract role when Binance Smart Chain launched on 1 September 2020.

BNB still has uses inside Binance products, but those discounts and programs follow the exchange’s terms. The chain’s validator and governance rules are a different layer of control from Binance account policy.

What problem does BNB solve?

BNB outgrew the exchange product that launched it. Binance Chain made it a native coin for a fast onchain order book, but lacked general smart contracts. BSC added EVM execution and staking beside the first chain, with BSC Token Hub carrying assets between them.

That bridge became the design’s sharpest test. In October 2022 an attacker forged proofs and withdrew 2 million newly created BNB. BNB Chain said its team contacted community validators one by one; validators then coordinated a suspension and upgrade. The response contained movement of the funds while showing how a small validator set could interrupt the network. Retiring Beacon Chain in 2024 removed the failed bridge path.

How does BNB work?

BNB pays BSC transaction fees and can be delegated to validators under Proof of Staked Authority. System contracts handle validator selection, delegation and penalties, while validators and client releases determine which protocol changes take effect. Binance discounts remain exchange policy.

Supply began at 200 million. Auto-Burn replaced quarterly burns based on Binance exchange activity with a formula using BNB price and BSC block production. BEP-95 separately destroys a validator-adjustable share of each block’s gas fees. The 36th burn announcement reported 1,615,827.795 BNB destroyed and total supply of 133,166,127.91 BNB at 10:35 UTC on 15 July 2026; that figure is a dated snapshot, not a permanent current balance.

Key facts

  • The 2017 whitepaper allocation recorded in the SEC complaint was 200 million BNB: 100 million for the public ICO, 80 million for the founding team and 20 million for angel investors.
  • BNB moved from Ethereum to Binance Chain in April 2019; Binance Smart Chain launched on 1 September 2020 with BNB as its gas and staking coin.
  • The February 2022 BNB Chain rebrand grouped Binance Chain and BSC without requiring users to move funds or change wallets.
  • Auto-Burn replaced exchange-activity-based quarterly burns; BEP-95 separately burns a validator-adjustable share of block gas fees.
  • The October 2022 Token Hub exploit withdrew 2 million newly created BNB after forged proofs passed through the native bridge.
  • BNB Chain said its team contacted validators one by one; community validators coordinated the BSC suspension and upgrade.
  • Beacon Chain stopped at block 385,251,927 on 3 December 2024 after its functions moved to BSC.
  • At 10:35 UTC on 15 July 2026, the 36th burn notice reported 1,615,827.795 BNB destroyed and total supply of 133,166,127.91.
  • CZ and Binance entered separate criminal guilty pleas in 2023. The SEC’s civil action ended with prejudice in 2025 by joint stipulation and policy discretion, without a merits ruling on BNB.

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Frequently asked questions

Is BNB still an ERC-20 token?

The original token was issued on Ethereum. BNB migrated to native Binance Chain in April 2019 and now serves as the native gas coin on BSC; BNB seen on other networks may be a bridged representation.

How could the Token Hub exploit create BNB?

The attacker forged low-level proofs accepted by the native bridge and withdrew 2 million newly created BNB. BNB Chain then contacted validators individually, and validators coordinated the network suspension and software upgrade.

How does BNB supply shrink?

Auto-Burn calculates a quarterly amount from BNB price and BSC block production. BEP-95 separately burns part of each block’s gas fees at a ratio validators can change. The July 2026 supply figure is the announcement’s timestamped snapshot.

Who can change BNB Chain?

Validators produce and finalize blocks, stake determines the active set, system contracts enforce delegation and penalties, and client software carries upgrades. The 2022 response showed that validators can also coordinate outside a formal onchain vote in an emergency.

Did the SEC obtain a ruling that BNB was a security?

No. The SEC alleged an unregistered BNB offering in 2023. The parties jointly dismissed the action with prejudice on 29 May 2025 as an exercise of SEC policy discretion, and no merits judgment classified BNB.

What did Binance and CZ plead guilty to?

CZ pleaded guilty to causing Binance to fail to maintain an effective anti-money-laundering program under the Bank Secrecy Act. Binance separately pleaded guilty to Bank Secrecy Act, unlicensed money-transmission and sanctions violations and agreed to a $4.3 billion resolution.

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