Creando un contrato inteligente en solidity para liberar fondos unas vez pasado un tiempo.

Hoy voy a elaborar un contrato inteligente que liberará una cantidad de tokens a una persona (address) una vez superado un tiempo límite para ese retiro.

Contrato Token

pragma solidity ^0.8.6;

contract Token{

string public name="My Token";

string public symbol="TKM";

uint8 public decimals=18;

uint public totalSupply=1000 × 10 ** decimals;

mapping(address => uint) public balanceOf;

mapping(address=> mapping(address=> uint)) public allowances;

event Transfer(address indexed from, address indexed to, uint amount);

event Approve(address indexed from, address indexed spender, uint amount);

event TransferFrom(address indexed from, address indexed to, uint amount);

constructor (){

balanceOf[msg.sender]=totalSupply;

}

function transfer (address receiver, uint amount) public {

require(balanceOf[msg.sender]>= amount);

require(receiver!=address(0));

balanceOf[msg.sender]-=amount;

balanceOf[receiver]+=amount;

emit Transfer(msg.sender, receiver, amount);

}

function approve(address spender, uint amount) public {

allowances[msg.sender][spender]= amount;

emit Approve(msg.sender, spender, amount);

}

function transferFrom(address from, address to,uint amount) public{

require(balanceOf[from]>=amount);

require(allowances[from][msg.sender] >= amount);

balanceOf[from]-=amount;

balanceOf[to]+=amount;

allowances[from][msg.sender]-=amount;

emit TransferFrom(from, to, amount);

}

}

ReleaseToken

pragma solidity ^0.8.6;

import "./Token";

contract ReleaseToken{

Token public token;

uint public releaseTime;

address public beneficiary;

constructor (uint _releaseTime, address _beneficiary, Token _token){

requiere(_releaseTime>block.timestamp);

token=_token;

beneficiary=_beneficiary;

releaseTime=_releaseTime;

}
function release() public {

require(block.timestamp> releaseTime);

require(token.balanceOf(address(this)>0));

token.transfer(beneficiary, balanceOf(address(this));

}

}

Una vez nuestros contratos estén desplegados vamos a transferirle tokens al contrato releaseToken. Para que de esta manera el contrato pueda transferirle esos tokens al beneficiario una vez superado el tiempo de liberación de tokens.

#solidity #smartcontract #ethereum #web3js #BSC #binancesmartchain #ether