What functions are required for an ERC-20 token?
An ERC-20 token must implement totalSupply(), balanceOf(address), transfer(address,uint256), allowance(address,address), approve(address,uint256), and transferFrom(address,address,uint256). These functions manage token supply, balances, approvals, and transfers. Events Transfer and Approval must also be emitted to maintain standard compliance. Using these ensures interoperability with wallets, exchanges, and other smart contracts.
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