> For the complete documentation index, see [llms.txt](https://jimmy-casini.gitbook.io/token-casini-csn-erc20/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jimmy-casini.gitbook.io/token-casini-csn-erc20/erc20-standard-specification.md).

# ERC20 standard specification

Standard specifies the interface with 6 functions and 2 events, but the implementation of functions is left out of specification.

#### Feature Specifications

The interface of the functions in the Solidity code is as follows:

* 1\. `totalSupply() public view returns (uint256 totalSupply)`– obtén el suministro total de tokens
* 2.- `balanceOf(address _owner) public view returns (uint256 balance)`obtenga el saldo de la cuenta con dirección \_propietario
* 3\. `transfer(address _to, uint256 _value) public returns (bool success)`– enviar \_valor cantidad de tokens a la dirección \_a
* 4\. `transferFrom(address _from, address _to, uint256 _value) public returns (bool success)`– enviar \_valor cantidad de tokens desde la dirección \_desde a la dirección \_a
* 5\. `approve(address _spender, uint256 _value) public returns (bool success)`– permita que \_spender retire dinero de su cuenta, varias veces, hasta la cantidad \_value
* 6\. `allowance(address _owner, address _spender) public view returns (uint256 remaining)`– devuelve la cantidad que \_spender todavía puede retirar de \_owner

#### Event Specifications

The events (in robustness code) are defined:

* 1\. `Transfer(address indexed _from, address indexed _to, uint256 _value)`– se activa cuando se transfieren tokens
* 2\. `Approval(address indexed _owner, address indexed _spender, uint256 _value)`– se activa cuando se llama a la función de aprobación.

**CODE**

* <https://etherscan.io/address/0x505df100eacacc68f5c915ac91a28027f332e6ac#code>