BNB was originally issued as an ERC-20 token, running on the Ethereum network, with a total supply of 200 million coins. ERC-20 BNB tokens were later swapped with BEP-2 BNB on a 1:1 ratio. The BEP-2 BNB is the native coin of the Binance Chain 100 million BNBs were offered in the ICO, but the current total supply is lower due to periodic burning events, in which Binance destroyed BNB held in its treasury.