Token Smart Contract

The code below is an example and requires further refinement for specific business tasks.

Interface BasicStandard is necessary to create a token (implementation is mandatory and provided below).

public interface BasicStandard {

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   String getName();

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   String getSymbol();

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   int getDecimal();

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   boolean setFrozen(boolean frozen);

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   String totalSupply();

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   String balanceOf(String owner);

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   String allowance(String owner, String spender);

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   boolean transfer(String to, String amount);

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   boolean transferFrom(String from, String to, String amount);

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   void approve(String spender, String amount);

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   boolean burn(String amount);

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}

As well as interface ExtensionStandard (Implementation is not mandatory, but recommended and is provided below).

public interface ExtensionStandard extends BasicStandard {

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   void register();

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   boolean buyTokens(String amount);

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}

Further is the example of a token implementation according to Credits standard.

Examples sets the following in the class constructor:

• Token name (name)
• Token symbol (symbol)
• Number of decimals (decimal)
• Public key of the token owner (owner)
• Total number of tokens (totalCoins)

Examples of implementation of Interfaces BasicStandard and ExtensionsStandard are provided below.

import java.math.BigDecimal;

import java.util.HashMap;

import java.util.Map;

import java.util.Optional;

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import ...;

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import ...;

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public class Token12 extends SmartContract implements ExtensionStandard {...}