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  1. ravinayag

    ERC20 Standards Token  is the Ethereum token system ,which is used for Ethereum smart contracts platform. Developed in 2015, ERC-20 defines a common list of rules to function within the Ethereum ecosystem. 

    The Ethereum community created these standards with six mandatory and three optional rules.

    Mandatory

    • totalSupply
    • balanceOf
    • transfer
    • transferFrom
    • approve
    • allowance

    Optional

    • Token Name
    • Symbol
    • Decimal (up to 18)

    Other ERC Token standards for Ref. 

    1. ERC-20 Token Standard. https://eips.ethereum.org/EIPS/eip-20
    2. ERC-165 Standard Interface Detection. https://eips.ethereum.org/EIPS/eip-165
    3. ERC-173 Owned Standard. https://eips.ethereum.org/EIPS/eip-173
    4. ERC-223 Token Standard. https://github.com/ethereum/EIPs/issues/223
    5. ERC-677 transferAndCall Token Standard. https://github.com/ethereum/EIPs/issues/677

    6. ERC-721 Non-Fungible Token Standard https://eips.ethereum.org/EIPS/eip-721

    7. ERC-827 Token Standard. https://eips.ethereum.org/EIPS/eip-827