Arbitrum Coin (ARB) is the native token of Arbitrum, an Ethereum Layer 2 scaling solution. Arbitrum is an Optimistic Rollup solution that significantly increases Ethereum's transaction capacity and speeds. Functions of Arbitrum Coin: Transaction Fees: ARB tokens are used to pay for transactions on Arbitrum. Security: ARB tokens are staked to secure and maintain the functionality of Arbitrum. Governance: ARB token holders have the right to vote on the future of the Arbitrum protocol.